Updated on 2026/07/27

写真a

 
CHIJIWA NOBUHIRO
 
Organization
School of Environment and Society Professor
Title
Professor
External link

Degree

  • 博士(工学) ( 2009.3   東京大学 )

Research Interests

  • Maintenance engineering, Concrete engineering, Material & structure integrated field

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Civil engineering material, execution and construction management

Education

  • The University of Tokyo   Graduate School, Division of Engineering   Department of Civil Engineering

    - 2009.3

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    Notes: Doctor course Completed

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  • The University of Tokyo   Graduate School, Division of Engineering   Department of Civil Engineering

    - 2006.3

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    Notes: Master course Completed

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  • The University of Tokyo   Faculty of Engineering   Department of Civil Engineering

    - 2004.3

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    Notes: Graduated

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Research History

  • Institute of Science Tokyo   School of Environment and Society, Department of Civil and Environmental Engineering   Professor

    2024.10

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    Country:Japan

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  • Tokyo Institute of Technology   School of Environment and Society, Department of Civil and Environmental Engineering   Professor

    2024.7 - 2024.10

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    Country:Japan

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  • Heriot-Watt University   School of Energy, Geoscience, Infrastructure and Society (EGIS)   Visiting Fellow

    2019.7 - 2019.11

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    Country:United Kingdom

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  • Tokyo Institute of Technology   School of Environment and Society, Department of Civil and environmental Engineering   Associate Professor

    2016.4 - 2024.7

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    Country:Japan

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  • Tokyo Institute of Technology   Department of Civil Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology   Assistant Professor

    2013.1 - 2016.3

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    Country:Japan

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  • Sirindhorn International Institute of Technology, Thammasat University   School of Civil Engineering and Technology   Visiting Lecturer

    2010.11 - 2011.3

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    Country:Thailand

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  • The University of Tokyo   Global COE Program 'Sustainable Urban Regeneration', Graduate School of Engineering   Project Research Associate

    2009.4 - 2012.12

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    Country:Japan

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Professional Memberships

Committee Memberships

  • 公益社団法人土木学会   調査研究部門 366地震作用に対するコンクリート構造物の時空間性能評価委研究小委員会 委員  

    2026.7 - 2028.6   

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    Committee type:Academic society

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  • 公益社団法人日本コンクリート工学会   アルカリ活性材料に関数するJCI規準原案作成委員会 委員  

    2026.4 - 2028.3   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 227コンクリート標準示方書に基づく数値解析認証小委員会 委員  

    2026.4 - 2027.3   

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    Committee type:Academic society

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  • 公益社団法人日本コンクリート工学会   fibコングレス2030準備委員会 委員  

    2026.4 - 2027.3   

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    Committee type:Academic society

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  • 一般財団法人首都高速道路技術センター   保全技術に関する検討部会(コンクリート構造部会) 委員  

    2026.1 - 2028.6   

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    Committee type:Other

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  • 公益社団法人土木学会   コンクリート委員会示方書改訂小委員会(2027-28年版) 設計編部会 委員 FEM SWG主査  

    2025.12 - 2027.11   

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    Committee type:Academic society

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  • 公益社団法人土木学会   コンクリート委員会示方書改訂小委員会(2027-28年版) 維持管理編部会 委員  

    2025.12 - 2027.11   

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    Committee type:Academic society

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  •   一般社団法人 ダム工学会 活性化推進小委員会 委員  

    2025.6 - 2026.5   

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  • 公益社団法人土木学会   調査研究部門 構造工学委員会 構造工学論文集編集委員会 委員  

    2025.6 - 2026.5   

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    Committee type:Academic society

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  •   公益社団法人 日本コンクリート工学会 既設コンクリート構造物の性能評価指針改訂原案作成委員会 委員  

    2025.4 - 2027.3   

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  • 公益社団法人土木学会   調査研究部門コンクリート委員会 委員  

    2025.4 - 2027.3   

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    Committee type:Academic society

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  • 公益社団法人日本コンクリート工学会   コンクリート診断士講習委員会 幹事  

    2025.4 - 2027.3   

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    Committee type:Academic society

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  •   公益社団法人 日本コンクリート工学会 構造性能に主眼を置いた鋼材腐食性状の診断・推定手法に関する研究委員会 委員  

    2025.4 - 2025.9   

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  • 公益社団法人土木学会   調査研究部門 構造工学委員会 カーボンニュートラルに向けた土木構造物のあり方に関する研究小委員会 委員  

    2024.12 - 2026.12   

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    Committee type:Academic society

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  • 一般財団法人首都高速道路技術センター   保全技術に関する検討部会(コンクリート構造部会) 委員  

    2024.12 - 2025.9   

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    Committee type:Other

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  • 公益社団法人土木学会   調査研究部門 建設マネジメント委員会 委員  

    2024.6 - 2026.6   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 土木学会論文集編集委員会 建設マネジメント編集小委員会(62小委員会) 委員長  

    2024.6 - 2026.6   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 土木学会論文集編集委員会 編集調整会議 委員  

    2024.6 - 2026.6   

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    Committee type:Academic society

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  •   公益社団法人 日本道路協会 性能評価・診断小委員会 主桁WG 副査  

    2024.6 - 2026.5   

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  •   一般財団法人 阪神高速先進技術研究所 コンクリート構造物検討委員会 喜連瓜破検討WG 委員  

    2024.6 - 2025.3   

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  •   日本コンクリート工学会 fibコングレス2030準備委員会 委員  

    2024.5 - 2026.3   

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  • 日本コンクリート工学会   コンクリート工学論文集編集委員会委員  

    2024.4 - 2026.3   

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    Committee type:Academic society

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  •   一般財団法人 首都高速道路技術センター 保全技術に関する検討部会(コンクリート構造部会)委員  

    2024.4 - 2024.9   

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  •   日本コンクリート工学会 JCI創立60周年記念事業実行委員会 委員  

    2023.6 - 2025.12   

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 366地震作用に対するコンクリート構造物の時空間性能評価研究小委員会 委員  

    2023.6 - 2025.5   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 構造工学委員会 構造工学論文集編集委員会 委員  

    2023.6 - 2025.5   

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    Committee type:Academic society

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  •   日本材料学会 関東支部常議員  

    2023.5   

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    Committee type:Academic society

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  •   日本コンクリート工学会 構造性能に主眼を置いた鋼材腐食性状の診断・推定方法に関する研究委員会 委員  

    2023.5 - 2025.3   

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  •   日本コンクリート工学会 コンクリート診断士講習委員会 委員  

    2023.4 - 2025.3   

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  •   公益社団法人 日本道路協会 性能評価・診断小委員会 主桁WG 副査  

    2023.3 - 2024.5   

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  • 公益社団法人土木学会   調査研究部門 土木学会論文集編集委員会 建設マネジメント編集小委員会(62小委員会) 幹事長  

    2022.6 - 2024.6   

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    Committee type:Academic society

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  •   日本材料学会 関東支部常議員  

    2022.6 - 2023.4   

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 101示方書改定小委員会2022設計編部会 委員  

    2022.4 - 2024.3   

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    Committee type:Academic society

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  • 調布市   調布市道路総合管理計画策定等推進委員  

    2022.4 - 2024.3   

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    Committee type:Municipal

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 255石炭ガス化細骨材を用いたコンクリートの設計・施工研究小委員会 委員  

    2022.4 - 2023.3   

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    Committee type:Academic society

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  •   公益社団法人 日本道路協会 コンクリート橋設計WG委員 コンクリート橋設計WG桁SWG委員  

    2022.4 - 2022.5   

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 201コンクリート教育研究小委員会 委員  

    2022.3   

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    Committee type:Academic society

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  •   日本コンクリート工学会 関東支部 コンクリート工学年次大会2022(千葉)実行委員会 委員  

    2021.7 - 2022.7   

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 <重点研究課題>233新しいアルカリ活性材料を用いた低酸素社会におけるインフラ構築に関する研究小委員会 委員  

    2021.5 - 2022.3   

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    Committee type:Academic society

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  •   富士見市 富士見市庁舎整備検討審議会 委員  

    2021.5 - 2022.3   

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    Committee type:Municipal

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  • 公益社団法人土木学会   調査研究部門 土木学会論文集編集委員会 F4分冊編集小委員会 委員  

    2020.12 - 2022.6   

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    Committee type:Academic society

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  • 公益社団法人日本コンクリート工学会   コンクリート工学年次論文査読委員会 委員  

    2020.10 - 2022.7   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 101示方書改定小委員会2022設計編部会 委員  

    2020.4 - 2022.3   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 255石炭ガス化細骨材を用いたコンクリートの設計・施工研究小委員会 委員  

    2020.4 - 2022.3   

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    Committee type:Academic society

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  •   調布市 調布市道路総合管理計画策定等推進委員  

    2020.1 - 2022.3   

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    Committee type:Municipal

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 361土木分野におけるジオポリマー技術の実用化推進のための研究小委員会 幹事  

    2019.8 - 2021.8   

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    Committee type:Academic society

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  •   土木学会 調査研究部門 コンクリート委員会 230示方書連絡調整小委員会 委員  

    2019.6 - 2021.6   

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 231既設構造物の健全性評価法の高度化および体系化に関する研究小委員会 委員  

    2019.6 - 2020.3   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 建設マネジメント委員会 アセットマネジメントシステム実装支援研究小委員会 幹事長  

    2019.4 - 2021.3   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 複合構造委員会 H215複合構造におけるコンクリートの収縮・クリープの影響に関する研究委員会 幹事長  

    2019.2 - 2021.2   

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    Committee type:Academic society

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  • 公益社団法人土木学会   技術推進機構 SIPインフラ連携委員会 新技術の地域実装促進小委員会(仮称) 委員  

    2019.1 - 2020.10   

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    Committee type:Academic society

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  •   日本コンクリート工学会 サステイナビリティ委員会 委員  

    2018.4 - 2020.3   

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 351コンクリート構造物の設計と連成型性能評価法に関する研究小委員会 地中構造物WG主査  

    2017.12 - 2019.12   

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    Committee type:Academic society

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  •   日本コンクリート工学会 コンクリートの生産・供給・施工システムの革新に関する研究委員会 WG2主査  

    2017.6 - 2019.3   

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  •   日本コンクリート工学会 ISO/TC71対応国内委員会 WG5委員  

    2017.5 - 2019.3   

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 262SIP対応高炉スラグ細骨材を用いたプレキャストコンクリート部材に関する研究小委員会 委員  

    2017.4 - 2019.3   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 複合構造委員会 H215複合構造におけるコンクリートの収縮・クリープの影響に関する研究委員会 幹事長  

    2016.7 - 2018.6   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 355既設コンクリート構造物の構造性能評価研究小委員会 委員  

    2016.5 - 2018.5   

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    Committee type:Academic society

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  •   日本コンクリート工学会 サステイナビリティ委員会 委員  

    2016.5 - 2018.3   

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  • 公益社団法人土木学会   技術推進機構 アセットマネジメントシステム実装のための実践研究委員会 委員  

    2016.4 - 2020.3   

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    Committee type:Academic society

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  • 一般社団法人日本建設機械施工協会 施工技術総合研究所   BRDガイドライン作成委員会 委員  

    2016.4 - 2017.3   

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    Committee type:Other

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 352コンクリートの性能に及ぼす高温作用の影響評価研究小委員会 委員  

    2016.3 - 2018.3   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 示方書改訂小委員会(101) 運営部会 幹事  

    2016.1 - 2018.3   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 354高炉スラグ細骨材を用いたコンクリートに関する研究小委員会 委員  

    2016.1 - 2018.1   

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    Committee type:Academic society

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  • 首都高技術株式会社   首都高技術土木技術検討WG  

    2015.10 - 2017.3   

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    Committee type:Other

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 示方書改訂小委員会(101) 設計編部会 委員(津波WG, 設計維持管理連携WG)  

    2015.5 - 2018.3   

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    Committee type:Academic society

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  •   日本コンクリート工学会 ISO/TC71対応国内委員会 WG5委員  

    2015.5 - 2017.3   

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  •   日本コンクリート工学会 関東支部 若手会21 代表  

    2015.4 - 2017.3   

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  •   Japan Concrete Institute  

    2015.4 - 2017.3   

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 351コンクリート構造物の設計と連成型性能評価法に関する研究小委員会 WG2主査  

    2015.1 - 2017.1   

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    Committee type:Academic society

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  • 公益社団法人土木学会   技術推進機構 アセットマネジメントシステム実装のための実践研究委員会 委員  

    2015.1 - 2016.3   

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    Committee type:Academic society

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  •   日本コンクリート工学会 関東支部選挙区代議員  

    2014.12 - 2016.12   

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 349コンクリートにおける水の微視的挙動研究小委員会 WG3主査  

    2014.9 - 2016.9   

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    Committee type:Academic society

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  •   日本コンクリート工学会 サステイナビリティ委員会 委員  

    2014.7 - 2016.3   

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  • 公益社団法人土木学会   コミュニケーション部門 土木学会誌編集委員会 委員  

    2014.6 - 2016.5   

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  • 公益社団法人土木学会   調査研究部門 コンクリート委員会 示方書連絡調整員会(224) 委員  

    2013.11 - 2015.11   

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    Committee type:Academic society

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  • 公益社団法人土木学会   調査研究部門 複合構造委員会 H101複合構造示方書小委員会 委員  

    2013.6 - 2015.6   

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    Committee type:Academic society

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  • 公益社団法人土木学会   鉄筋コンクリート構造の疲労破壊研究小委員会 委員  

    2013 - 2014   

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    Committee type:Academic society

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  • 公益社団法人土木学会   津波による橋梁構造物に及ぼす波力の評価に関する調査研究委員会 幹事  

    2011 - 2013   

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    Committee type:Academic society

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  •   日本コンクリート工学協会 コンクリート構造物のひび割れ進展評価手法に関する研究委員会 委員  

    2011 - 2012   

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  •   Japan Concrete Institute  

    2010 - 2019.2   

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  •   日本コンクリート工学協会 耐久性力学に基づく収縮影響評価研究委員会 協力委員  

    2010 - 2011   

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  •   Japan Society of Dam Engineers  

    2008 - 2027.5   

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  •   セメント若手の会 幹事  

    2004 - 2007   

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Papers

  • 道路橋上床版を対象とした材料構造連成応答解析による含水状態の再現と収縮ひずみ評価法の提案 Reviewed

    湯淺康史, 西原知彦, 土屋智史, 千々和伸浩

    48 ( 2 )   1273 - 1278   2026.7

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  • Performance Evaluation of Corroded Half-Joint Girders by Experiments and Nonlinear Finite Element Analysis Reviewed

    Ryota Kurihara, Nobuhiro Chijiwa

    Proceedings of 7th fib congress   4024 - 4033   2026.6

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  • Deterioration Prediction and Optimal Repair Timing Assessment for RC Abutments in Tidal River Environments Reviewed International journal

    Y. Suzuki, N. Chijiwa, K. Nakayama, M. Iwanami, A.S. Syll

    International Conference on Durability of Concrete Structures   CMS01   2025.10

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Purdue University  

    DOI: 10.5703/1288284318115

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  • PC鋼材破断時のプレストレス変化が鋼材ひずみと耐荷性状に及ぼす影響 Reviewed

    橋本龍一, Syll Amadou Sakhir, 栗原遼大, 千々和伸浩

    第34回プレストレストコンクリートの発展に関するシンポジウム論文集   2025.10

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    Recently, many cases of PC tendon ruptures have been reported, and there is a need for more advanced methods to evaluate the load capacity of PC at rupture. When a PC tendon ruptures, stress redistribution due to prestress loss may influence the load capacity of the PC. In this research, PC tendon rupture experiments using core drilling were conducted on PC beams with different PC tendon-grout bond conditions to evaluate the possibility of stress redistribution and the influence of bond conditions on stress redistribution and strain change in the member. In addition, loading experiments and loading analysis were conducted on PC beams with ruptured tendons to evaluate the influence of stress redistribution on load capacity.

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  • PC鋼より線破断後の再定着に影響を与える因子についての解析的検討 Reviewed

    増井創大, 千々和伸浩, Syll Amadou Sakhir, 栗原遼大

    第34回プレストレストコンクリートの発展に関するシンポジウム論文集   2025.10

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  • 鉄筋腐食を有する桟橋梁の残存性能評価手法と実桟橋への適用に関する研究 Reviewed

    宇野州彦, Cabatit Kyle Didacus, 千々和伸浩, 田中豊, 山路徹

    コンクリート構造物の補修・補強・アップグレード論文報告集   2025.10

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  • Deterioration Mechanism of Protective Coating Materials for Anti-corrosion in Sewage Facilities Under Long-term Service Environment Reviewed

    Kenichi Fujisawa, Ryuta Imai, Nobuhiro Chijiwa, Manabu Fujii

    Concrete Research and Technology   Vol. 36   61 - 69   2025.9

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    Surface protection methods are primarily employed to mitigate sulfuric acid-induced deterioration in sewerage facilities. While laboratory-scale accelerated testing has been conducted to examine the sulfuric acid resistance of surface protective coatings, little research has been done in actual facilities, and the mechanism of sulfuric acid penetration and structural deterioration remains unclear. This study investigated the effects of surface protective coatings in actual facilities with approximately 20 years of service to shed light on the long-term deterioration mechanism. A series of analyses revealed that, in environments where sulfuric acid is present, the acid can penetrate the protective coating material and gradually deteriorate the underlying concrete. Furthermore, the pH drop caused by sulfuric acid was observed to extend beyond the neutralization depth zone, affecting the structural integrity of the hardened concrete.

    DOI: 10.3151/crt.36.61

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  • Study on Radio Wave Transparency Improvement of Concrete Focusing on Internal Water Content Reviewed International journal

    Ryo Sakamoto, Nobuhiro Chijiwa, Kentaro Saito, Kazuhide Nakayama, CheChia Kang

    Journal of Advanced Concrete Technology   Vol. 23 ( Issue 8 )   395 - 409   2025.8

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    DOI: 10.3151/jact.23.395

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  • 曲げモーメントを受ける鉄筋コンクリート部材の限界状態に関する検討 Reviewed

    桑野仁成, 吉田英二, 中村英佑, 千々和伸浩

    コンクリート工学年次論文集   47 ( 2 )   241 - 246   2025.7

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  • MICP using calcium-rich waste solution from acetic acid treatment as a calcium source to improve the properties of recycled coarse aggregate Reviewed International journal

    Wiracha Thaue, Mitsuyasu Iwanami, Kazuhide Nakayama, Nobuhiro Chijiwa

    Construction and Building Materials   Volume 489   2025.6

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  • Study on the nucleation process of reaction products in geopolymer by in situ test using Raman microscopy Reviewed International journal

    Ryo Sakamoto, Federico P. Pederson, Hee-Jeong Kim, Nobuhiro Chijiwa

    Journal of Building Engineering   Vol. 111   2025.6

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    This study investigates the growth process of reaction products in geopolymer by in situ test using Raman microscopy and the new analysis procedure. Geopolymer is a new cementitious material which solidifies by the dehydration-polycondensation reaction of alumina-silica precursors. It has been proposed as a replacement for ordinary Portland cement as the primary construction material, and as one of the construction materials used in space. In addition, the application of geopolymer has also shown the potential to reduce radio interference caused by concrete structures. However, the reaction mechanism is not yet clear and a method for controlling its performance has not been established. This study focuses on the visualization of growth process of reaction products in order to clarify the nucleation mechanism, which is the main factor influencing the microstructure and mechanical properties of geopolymer. The system was constructed for in situ Raman microscopy while samples were cured at a high temperature to accelerate the reaction, and the same area scans were repeated for fly ash-based geopolymer up to 24 h after mixing. The Raman spectrum of reaction products was defined as the difference between the average spectrum of the first and last scans, because the Raman spectrum of reaction products of geopolymer has not been clarified due to their amorphous structure. Finally, the obtained Raman mapping images at each time step are the first visualization of the growth of reaction products in geopolymer.

    DOI: 10.1016/j.jobe.2025.113232.

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  • Experimental and Analytical Study of RC Beams with Combined Steel Mass Loss and Spalling Reviewed International journal

    Kyle Cabatit, Nobuhiro Chijiwa, Kunihiko Uno, Yutaka Tanaka, Toru Yamaji

    IABSE Symposium Tokyo 2025   3361 - 3369   2025.5

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    The corrosion of reinforcing steel bars in concrete threatens the performance of reinforced concrete structures. This study investigates the structural performance of severely corroded RC beams, focusing on rebar section loss, bond loss, and concrete spalling. Seven beam specimens were constructed with varying corrosion levels using the impressed current method, and different cover levels using paper clay. Loading tests provided the mid-span deflection curves, while digital image correlation showed the crack patterns. Flexural capacity decreased with greater corrosion and cover loss, though a residual bond mechanism was observed at 50% cover loss due to partial steel- concrete contact. This mechanism diminished with higher mass losses as rebar lugs deteriorated. Beams with complete cover loss showed lower strength. Finite element analysis using COM3 was conducted on the experimental beams, and beams extracted from an actual wharf structure.

    DOI: 10.2749/tokyo.2025.3361

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  • Novel fiber reinforced concrete based on liquid metal technology toward resource recycling society Reviewed International journal

    Kondo Masatoshi, Kano Yuki, Chijiwa Nobuhiro, Oh Minho

    Progress in nuclear science and technology   Vol. 7   243 - 249   2025.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Atomic Energy Society of Japan  

    DOI: 10.15669/pnst.7.243

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  • STUDY ON RADIO WAVE TRANSPARENCY IMPROVEMENT OF CONCRETE FOCUSING ON INTERNAL WATER CONTENT Reviewed

    Ryo SAKAMOTO, Nobuhiro CHIJIWA, Kentaro SAITO, Kazuhide NAKAYAMA, CheChia KANG

    Journal of JSCE   Vol. 81 ( No. 3 )   2025.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejj.24-00070

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  • Numerical Simulation of Residual Structural Performance of a PC Girder with Ruptured Prestressed Tendon Using Finite Element Analysis International journal

    Chijiwa Nobuhiro, Cabatit Kyle Didacus V., Syll Amadou S.

    2025.3

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  • 中小河川に架かる橋梁を対象とした効率的な定期点検への取り組み Reviewed

    後藤幹尚, 藤森竣平, 近藤冬東, 岩波光保, 千々和伸浩, 津野和宏

    インフラメンテナンス実践研究論文集   Vol. 4 ( No. 1 )   11 - 20   2025.2

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  • Study on Time-Dependent Deformation Characteristics of Geopolymer Concrete Reviewed International journal

    Kotaro Maekawa, Ryo Sakamoto, Nobuhiro Chijiwa, Kazuhide Nakayama

    2024.11

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  • Study on the Load-Bearing Characteristics of Fiber-Reinforced Concrete Members Using Low-Melting-Point Metal Fibers Reviewed International journal

    Nobuhiro Chijiwa, Takumi Yabe, Kyoka Inoue, Satoshi Noboru, Kazuhide Nakayama, Masatoshi Kondo, Minho O

    2024.11

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:The School of Civil Engineering and Technology, Sirindhorn International Institute of Technology, Thammasat University, Thailand  

    Fiber-reinforced concrete, designed to complement the weakness of concrete by incorporating fibers, faces challenges during disposal, making material separation and recycling difficult and hindering progress toward a circular society. In an effort to overcome these challenges, an attempt was made to develop fiber-reinforced concrete utilizing the properties of metals that melt at low temperatures, such as aluminum. The approach involved subjecting only the metal fiber portion to heating considerably below the melting point of steel, facilitating the melting of metal fibers and separation from the concrete. To ensure the bond between fibers and concrete while preventing entanglement of low-rigidity, low-melting-point metal fibers, test specimens were created by combining different types and shapes of low-melting-point metal fibers. Materials and shapes that aligned with the objectives were identified based on the results of these material tests. Significantly, it was found that in cases of fiber reinforcement using low-melting-point metals, the advantageous approach lies in leveraging the energy absorption capacity derived from the deformability of low-rigidity fibers, rather than aiming to suppress crack openings to enhance structural performance. When small test specimens (100mm x 100m x 400mm or smaller) reinforced with aluminum fibers, one of the low-melting-point metals, were created, a challenge was encountered where aluminum reacted with cement, resulting in the formation of a weak layer at the fiber interface and a decrease in bond. To overcome this challenge, a pre-treatment was applied to form an oxide film on the surface of aluminum. This pre-treatment effectively suppressed the reaction at the interface and improved the bond. Finally, using these pre-treated aluminum fibers, reinforced concrete beams (RC beams) were created and loading tests were conducted, revealing a significant improvement in energy absorption compared to loading tests using ordinary concrete, achieving the expected outcomes.

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  • PC鋼材破断時の鋼材間の応力伝播が耐荷性状に及ぼす影響 Reviewed

    橋本龍一, 千々和伸浩, 栗原遼大

    2024.10

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  • 深海環境におけるRCはりの原位置載荷実験と解析的検討 Reviewed

    石鍋直樹, 藤川理沙子, 千々和伸浩, 岩波光保

    コンクリート工学年次論文集   Vol. 46 ( No. 1 )   289 - 294   2024.6

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  • 実環境下におけるジオポリマーコンクリートの時間依存変形特性に関する検討 Reviewed

    前川虎大郎, 坂本亮, 千々和伸浩, 中山一秀

    コンクリート工学年次論文集   Vol. 46 ( No. 1 )   1219 - 1224   2024.6

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  • 低弾性材料で上面増厚補強を施したRC床版の疲労寿命への水の影響に関する解析的検討 Reviewed

    浦島康希, 千々和伸浩, 田中大介, 上條崇

    コンクリート工学年次論文集   Vol. 46 ( No. 2 )   1057 - 1062   2024.6

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  • Effect of Cement Addition on Shrinkage Properties of Fly Ash-Based Geopolymer Reviewed International journal

    Horhok Lim, Mitsuyasu Iwanami, Nobuhiro Chijiwa, Kazuhide Nakayama

    2024.6

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  • Utilization of high-volume fly ash in pervious concrete mixtures for mangrove conservation Reviewed International journal

    Januarti Jaya Ekaputri, Xevna De Elshinta Arellsya Ruitan, Himawan Tri Bayu Murti Petrus, Martin Anda, Liliek Harmianto Purbawinasta, Irwanda Laory, Davin H.E. Setiamarga, Nobuhiro Chijiwa, Chikako Fujiyama

    Resources, Conservation & Recycling Advances   2024.2

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    DOI: 10.1016/j.rcradv.2024.200204

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  • 跨線橋の定期点検における効率化の取組み Reviewed

    後藤幹尚, 岩波光保, 千々和伸浩, 津野和宏

    インフラメンテナンス実践研究論文集   Vol. 3 ( No. 1 )   116 - 125   2024.2

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  • 橋のメンテナンスの区民協働に向けて実施した新たな意識付け活動の考察

    後藤朋子, 後藤理沙, 後藤浩, 後藤幹尚, 藤森俊平, 岩波光保, 千々和伸浩, 津野和宏

    インフラメンテナンス実践フォーラム   Vol. 1 ( No. 1 )   50 - 57   2024.2

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  • Multiscale analysis of shrinkage-induced performance degradation of shear wall and application to structural analysis Reviewed International journal

    Ryota Kurihara, Nobuhiro Chijiwa

    Structures   Vol. 61   2024.2

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    Shrinkage-induced cracks reduce the stiffness of concrete structures. Shear walls are more sensitive to drying shrinkage than other members because of their fully restricted condition and large surface areas exposed to air. This study examines how concrete structural performance is affected by shrinkage due to moisture loss via hydration or dissipation by applying multiscale integrated finite element analysis. First, a cyclic shear loading test on shear wall specimens subjected to drying in a previous study was reproduced. Based on the reproduction analysis model, parametric analysis was conducted, focusing on the member scale, mix proportion, and surface treatment of concrete. Shrinkage-induced cracks reduced member stiffness, and the effects of the member scale on drying speed were shown. The dominance of autogenous shrinkage in the case of high-strength concrete was also observed. The sealing of the concrete surface effectively prevented moisture dissipation, but moisture supply from ambient air was also blocked when the humidity inside the concrete was low. Thus, a proper surface protection method should be selected considering water consumption via hydration. Finally, the use of equivalent material properties for considering initial damage due to shrinkage was proposed as a simple way to account for drying effects in structural analyses.

    DOI: 10.1016/j.istruc.2024.106051

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  • Effects of Severe Chloride-Induced Corrosion with Spalling on the Structural Performance of RC Structures in Marine Environments: An Experimental Study Reviewed International journal

    Kyle Cabatit, Nobuhiro Chijiwa, Kunihiko Uno, Yutaka Tanaka, Toru Yamaji

    2024

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  • Effect of cracks along rebars on the bond deterioration under tensile stress in reinforced concrete Reviewed International journal

    M. Kojima, N. Chijiwa, R. Kurihara

    26th Australasian Conference on Mechanics of Structures and Materials (ACMSM26)   2023.12

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  • Identification of the Local Environmental Condition Acting on Bridges over Tidal Rivers and Prediction of Future Deterioration International journal

    Yuto Suzuki, Nobuhiro Chijiwa, Kazuhide Nakayama, Mitsuyasu Iwanami

    2023.10

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  • Effect of Analytical Parameters on the FE Analysis with the Smeared Crack Model of RC Beams without Shear Reinforcement FE Analysis With the Smeared Crack Model of RC Beams Without Shear Reinforcement International journal

    Rentaro Uchinishi, Akiharu Matsushiro, Nobuhiro Chijiwa

    2023.10

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  • 地域・管路情報の統合による下水道圧送管の劣化損傷リスク評価システムの開発 Reviewed

    石田大晟, 千々和伸浩, 藤井学, 藤澤健一, 倉田知一

    第60回下水道研究発表会講演集   N-7-5-2   2023.8

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  • 防食被覆層の施工が下水道コンクリート構造物の耐久性に与える影響

    今井隆太, 千々和伸浩, 藤井学, 藤澤健一, 倉田知一

    第60回下水道研究発表会講演集   N-8-3-5 ( 2695 )   2023.8

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  • 既設濃縮余剰汚泥貯留槽の調査結果に基づく防食被覆工法の有効性の検討 Reviewed

    今井隆太, 千々和伸浩, 藤澤 健一, 藤井学

    コンクリート工学年次論文集   Vol. 45   2023.7

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  • 高速道路跨道橋で発生した過大なたわみの原因機構に関する解析的検討 Reviewed

    大橋夏樹, 千々和伸浩, 吉野通範, 菊池 新平

    コンクリート工学年次論文集   Vol. 45   2023.7

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  • 鉄筋に沿ったひび割れが鉄筋ーコンクリート間の付着劣化に及ぼす影響 Reviewed

    小島萌, 千々和伸浩, 栗原遼大

    コンクリート工学年次論文集   Vol. 45   2023.7

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  • The effect of non-uniform steel bar corrosion on pre-stressed RC members subjected to hysteretic load at the mid-span: experimental study and three-dimensional FEM modeling Reviewed International journal

    Rajib Kumar Biswas, Mitsuyasu Iwanami, Nobuhiro Chijiwa, Takahiro Saito

    Archives of Civil and Mechanical Engineering   23   2023.6

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    DOI: 10.1007/s43452-023-00705-8

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  • A new implicit gradient damage model based on energy limiter for brittle fracture: Theory and numerical investigation Reviewed International journal

    Hung Thanh Tran, Tinh Quoc Bui, Nobuhiro Chijiwa, Sohichi Hirose

    Computer Methods in Applied Mechanics and Engineering   Vol. 413   2023.5

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    We present a general form of the gradient-enhanced damage theory and its numerical implementation using finite element method (FEM) in modeling quasi-static brittle crack growth in one- (1D), two- (2D) and three-dimensional (3D) bodies. Coupled equations of the equilibrium and a new implicit gradient damage formulation are introduced to govern the deformation of the solid and evolution of the damage. The resulting nonlocal damage evolution equation featuring the growth of diffusive crack is integrated with a characteristic length scale to eliminate the common mesh-bias issue in FEM implementation. In contrast to the traditional gradient-enhanced damage approaches, the nonlocal damage field here is defined as the primary variable of the damage evolution equation without interpolation mismatch between the displacement and nonlocal damage fields. For derivation of the material constitutive law and local damage parameter, a novel strain energy density (SED) function based on the energy limiter theory for brittle crack growth problems under small strain regime is introduced. To further improve the performance of the developed model, an initial SED threshold, which is used for determining the critical point when damage starts to initiate in the material, is integrated into the novel energy limiter theory. For preventing nonphysical failure in compression domains, the spectral decomposition technique for the strain tensor is adopted to split the reference SED. With integrating the energy limiter into the developed theory, unlike the conventional nonlocal damage theories where the interpretation of the length scale is still ambiguous, the developed nonlocal damage model defines the length scale parameter as the problem-dependent factor. The performance and ability of the proposed model are demonstrated via a set of representative numerical examples in 1D, 2D and 3D fracture problems.

    DOI: 10.1016/j.cma.2023.116123

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  • Cause Estimation and Safety Assessment of Tomei Expressway Bridge with Excessive Deflection Reviewed

    Michinori Yoshino, Shinpei Kikuchi, Kenji Wakatuki, Nobuhiro Chijiwa

    Journal of Structural Engineering, A   Vol. 69A   734 - 741   2023.4

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    The overpass of the Tomei Expressway has been in operation for 50 years, and repairs are progressing with aging. While the overpass in Fuji City, Shizuoka Prefecture, has also been inspected and repaired, many cracks have been detected on the lower surface of the PC-girder of the standard oblique π-shape bridge and the decrease in prestress is suspected as a cause. This paper reports the results of investigations to estimate the cause of the measured deflection and assess the structural safety of the bridge.

    DOI: 10.11532/structcivil.69A.734

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  • Examination of Structural performance of Reinforeced concrete beams using Coal gasification slag as Fine aggregate Reviewed

    Yoshitaka Matsuura, Kyosuke Takahashi, Nobuhiro Chijiwa, Mitsuyasu Iwanami

    Journal of Structural Engineering, A   Vol. 69A   884 - 892   2023.4

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    The effect of using coal gasification slag as fine aggregate (CGS) generated from integrated coal gasification combined cycle for reinforced concrete beams was evaluated by bending, shearing, and axially-load tension tests. Results show that the long-term compressive strength increased with the use of CGS, but the crack initiation load tended to degrease. On the other hand, it was confirmed that the load-bearing performance was equivalent to that of concrete using a normal aggregate. Therefore, it is considered possible to use existing evaluation formulas to calculate flexural strength and shear strength. In conclusion, this study shows that CGS concrete can be used for structural members.

    DOI: 10.11532/structcivil.69A.884

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  • メンテナンスの区民協働を通じた橋の新たな価値の創造に向けた取り組み-未来へつなぐ おおたの橋- Reviewed

    後藤幹尚, 川越貴水, 浅野和香奈, 後藤朋子, 多和田俊介, 岩波光保, 千々和伸浩, 津野和宏

    インフラメンテナンス実践研究論文集   Vol. 2 ( No. 1 )   11 - 20   2023.2

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    DOI: 10.11532/jsceim.2.1_11

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  • 感潮河川にかかる橋梁の下部構造に対する非破壊調査の適用について Reviewed

    後藤幹尚, 岩野聡史, 高鍋雅則, 影澤雅人, 三輪空司, 岩波光保, 千々和伸浩, 津野和宏

    インフラメンテナンス実践研究論文集   Vol. 2 ( No. 1 )   48 - 58   2023.2

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  • A simplified approach to estimate seismic fragility of corrosion damaged RC bridge piers Reviewed International journal

    R. K. Biswas, M. Iwanami, N. Chijiwa, T. Saito, C. M Chuquitaype

    Developments in the Built Environment   Vol. 12   2022.12

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  • A Study of an Implementation System of Public Works Having Resilience to Crisis

    Reia Suzuki, Nobuhiro Chijiwa

    2022.12

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    Language:Japanese   Publishing type:Research paper (conference, symposium, etc.)   Publisher:Japan Society of Civil Engineers  

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  • Assessment of bond deterioration in corroded RC members incorporating cracking response and tension stiffening Reviewed International journal

    Atichon Kunawisarut, Iwanami Mitsuyasu, Chijiwa Nobuhiro, Nakayama Kazuhide

    Structure and infrastructure engineering : maintenance, management, life-cycle design and performance   2022.10

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  • Effect of Cracks along Main Reinforcement on the Bond between Rebar and Concrete Reviewed

    Moe Kojima, Ryota Kurihara, Nobuhiro CHIJIWA

    Vol. 22   475 - 480   2022.10

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  • Mechanical Characteristics of Low Melting Point Metal Fiber Reinforced Concrete and Characteristic Change after Fiber Melting by Heating Reviewed

    Hikaru HANAZONO, Nobuhiro CHIJIWA, Satoshi NOBORU, Masatoshi KONDO, Minho O

    Vol. 22   385 - 390   2022.10

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  • Effect of graphene oxide nanosheets on properties of concrete Reviewed

    Mio Shimazaki, Ryo Sakamoto, Nobuhiro CHIJIWA

    Vol. 22   91 - 96   2022.10

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  • Determination of Johnson–Cook Material and Failure Model Constants for HighーTensileーStrength Tendon Steel in PostーTensioned Concrete Members

    Ioannis Gkolfinopoulos, Nobuhiro Chijiwa

    Applied Sciences   Vol. 12 ( No. 15 )   2022.8

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    DOI: 10.3390/app12157774

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  • Determination of Johnson–Cook Material and Failure Model Constants for HighーTensileーStrength Tendon Steel in PostーTensioned Concrete Members Reviewed International journal

    Ioannis Gkolfinopoulos, Nobuhiro Chijiwa

    Applied Sciences   Vol. 12 ( No. 15 )   7774   2022.8

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    DOI: 10.3390/app12157774

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  • Analytical evaluation on the stiffness reduction of RC shear wall subjected to environmental action by multi scale thermo hygral analysis Reviewed

    Ryota Kurihara, Nobuhiro Chijiwa

    GS1-03   2022.6

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    DOI: 10.11345/japannctam.66.0_213

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  • CRACK-INDUCING CHARACTERISTICS AND CRACK CONTROL EFFECT IN LINING CONCRETE DUE TO CRACK-INDUCING JOINT FORMATION Reviewed

    Takahiro Saito, 浜田 元, 目黒 緑, Nobuhiro Chijiwa, Mitsuyasu Iwanami

    Vol. 78 ( No. 1 )   40 - 54   2022.5

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    DOI: 10.2208/jscejte.78.1_40

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  • 次世代の橋梁長寿命化修繕計画の実践-大田区での取り組み事例- Reviewed

    後藤幹尚, 槇野ちひろ, 長瀬祥敬, 志村航, 岩波光保, 千々和伸浩, 津野和宏

    インフラメンテナンス実践研究論文集   Vol. 1 ( No. 1 )   504 - 513   2022.3

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    DOI: 10.11532/jsceim.1.1_504

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  • The Influence of Interlock Loss between Rebar and Concrete on Bond Performance of RC Member

    Ryota Kurihara, Youhei Ito, Qianghua Cai, Nobuhiro Chijiwa

    Applied Sciences   Vol. 12 ( Issue 3 )   2022.1

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    DOI: 10.3390/app12031079

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  • 災害対応時の道路ネットワーク確保を目指した橋梁耐震整備計画の検討-大田区の現状と対策- Reviewed

    後藤幹尚, 長瀬祥敬, 槇野ちひろ, 井上雅志, 沼田宗純, 岩波光保, 千々和伸浩

    第12回インフラ・ライフライン減災対策シンポジウム講演論文集   2022.1

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  • The Influence of Interlock Loss between Rebar and Concrete on Bond Performance of RC Member Reviewed International journal

    Ryota Kurihara, Youhei Ito, Qianghua Cai, Nobuhiro Chijiwa

    Applied Sciences   Vol. 12 ( Issue 3 )   1079   2022.1

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    DOI: 10.3390/app12031079

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  • Proposal of a Corrosion Prediction Method for Reflecting Measured Environmental Conditions in Sanitary Sewerage Pipes Reviewed

    Ryuta Imai, Nobuhiro Chijiwa, Manabu Fujii

    Proceedings of the Concrete Structure Scenarios, JSMS, Vol. 21   21   2021.10

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    J-GLOBAL

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  • Structural assessment of the coupled influence of corrosion damage and seismic force on the cyclic behaviour of RC columns Reviewed International journal

    R. K. Biswas, M. Iwanami, N. Chijiwa, K. Nakayama

    Construction and Building Materials   ( No. 304 )   2021.10

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    DOI: 10.1016/j.conbuildmat.2021.124706

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  • The influence of bond loss due to steel corrosion on the shear behavior of RC beams Reviewed

    Qianghua Cai, Youhei Ito, Ryouta Kurihara, Nobuhiro Chijiwa

    Proceedings of the Concrete Structure Scenarios, JSMS, Vol. 21   2021.10

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  • 道路の維持管理業務に着目した包括的民間委託導入に向けた土木行政における地方自治体職員の意思決定行動の分析 Reviewed

    曾川 宏彬, 岩波 光保, 千々和 伸浩, 中山 一秀

    土木学会論文集F4(建設マネジメント)   Vol. 77 ( No. 1 )   172 - 190   2021.8

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    DOI: 10.2208/jscejcm.77.1_172

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  • Analytical evaluation on the influence of deterioration of bond between rebar and concrete on structural performance of RC structures Reviewed International journal

    Ryota KURIHARA, Youhei ITO, Nobuhiro CHIJIWA

    Proceedings of the 2021 session of the 13th fib international PhD Symposium in Civil Engineering   83 - 90   2021.7

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  • Effect of rebar corrosion in concrete on interaction zone under tensile load Reviewed International journal

    A. Kunawisarut, M. Iwanami, N. Chijiwa, K. Nakayama

    Proceedings of 10th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020)   2068 - 2074   2021.4

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  • Influence of bond on the fatigue behavior of reinforced concrete beams without stirrups Reviewed International journal

    B. Suryanto, N. Chijiwa

    Proceedings of 10th International Conference on Bridge Maintenance, Safety and Management   2705 - 2710   2021.4

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    DOI: 10.1201/9780429279119-369

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  • Improving Geopolymer Characteristics with Addition of Poly-Vinyl Alcohol (PVA) Fibers Reviewed International journal

    Ekaputri, J.J., Fujiyama, C., Chijiwa, N., Ho, T.D., Nguyen, H.T.

    Civil Engineering Dimension   Vol. 23 ( No. 1 )   28 - 34   2021.3

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    DOI: 10.9744/ced.23.1.28-34

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  • Numerical evaluation of corroded RC columns subjected to reversed cyclic loading, International journal

    R. K. Biswas, M. Iwanami, N. Chijiwa, K. Nakayama

    2021.3

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  • Effect of steel bar corrosion on the cyclic behaviour of RC bridge piers, Proceedings of 11th International Conference on Materials Processing and Chracterization Reviewed International journal

    R. K. Biswas, M. Iwanami, N. Chijiwa, K. Nakayama

    Proceedings of 11th International Conference on Materials Processing and Chracterization   2020.12

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  • PROPOSAL OF LOCAL GOVERNMENT ORGANIZATION SYSTEM SUITABLE FOR ASSET MANAGEMENT — A CASE STUDY IN SHIBUYA CITY

    Naoaki Nishio, Yoshiyuki Sato, Nobuhiro Chijiwa, Kazuhide Nakayama, Mitsuyasu Iwanami

    2020.12

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  • Mitigating Bond Deterioration under Cyclic Loading and Water Exposure Reviewed International journal

    Tomohisa Saito, Nobuhiro Chijiwa, Hiroo Shinozaki, Mitsuyasu Iwanami

    ACI Structural Journal   Vol. 117 ( Issue 6 )   17 - 30   2020.11

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    Several cases of premature damage of wind turbine tower foundations constructed using the anchor-ring method have been reported to cause towers’ uplift. Sludge buildup (in the form of crushed concrete) was evident along the periphery of the damaged base towers and was found to originate mainly from the concrete-steel interface around the steel anchor foundation that is embedded in concrete, due to the cyclic movement of the anchor steel and the induced water pressure at the interface. This study experimentally investigated possible repair and reinforcing methods to mitigate this problem. Cyclic load tests were carried out on three steel anchor mockup specimens. In the first two specimens, the anchor steel was retrofitted with a nonshrink mortar and epoxy resin, respectively, whereas in the other specimen, the anchor steel was further restrained against uplift by additional anchorage bars. The results indicate that the non-shrink mortar was not effective in preventing water ingress into the interface and could only delay the extent of concrete damage and the progress of bond deterioration during cyclic loading. Epoxy resin was found to perform much better in this regard. In addition, the epoxy layer could also help to dissipate the induced bearing stresses under cyclic loading, thereby making it the best candidate for repair and reinforcing materials in such applications. The use of additional anchorage bars was also found to be effective, although it still requires additional measure to prevent moisture ingress.

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  • 月夜野大橋の長期的なクリープ計測と一考察 Reviewed

    今井 遥平, 千々和伸浩, 永来 良吾

    プレストレストコンクリート工学会 第29回シンポジウム論文集   179 - 182   2020.10

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  • FORENSIC ANALYSIS OF REINFORCED CONCRETE HALF-JOINTS USING NONLINEAR FINITE ELEMENT ANALYSIS Reviewed International journal

    Nobuhiro Chijiwa, Benny Suryanto, Ryota Kurihara

    Advances in Construction Materials, Proceedings of the ConMat'20   7-3_4   2020.9

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  • 波浪による消波ブロックのロッキング衝突現象に関する実験的研究 Reviewed

    昇悟志, 堀内滋人, 三井順, 久保田真一, 千々和伸浩, 岩波光保

    土木学会論文集B3   Vol. 76 ( No. 1 )   33 - 45   2020.8

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  • Impacts from concrete microstructure and surface on the settlement of sessile organisms affecting chloride attack Reviewed International journal

    T. Chlayon, M. Iwanami, N. Chijiwa

    Construction and Building Materials   Vol. 239   2020.4

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  • Effect of non-uniform rebar corrosion on structural performance of RC structures Reviewed International journal

    R. K. Biswas, M. Iwanami, N. Chijiwa, K. Uno

    Construction and Building Materials   Vol. 230   2020.1

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    DOI: 10.1016/j.conbuildmat.2019.116908

    Web of Science

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  • The Influence of the Deterioration of Concrete-Rebar Bond due to Corrosion on the Structural Performance of RC Structures Reviewed International journal

    Y. Ito, R. Kurihara, N. Chijiwa

    P147   2019.12

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  • 局所的に発生した鉄筋腐食がRCはりの耐疲労性に与える影響

    高橋実花, 千々和伸浩, 岩波光保

    2019.9

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  • Finite Element Analysis of RC Beams Subjected to Non-Uniform Corrosion of Steel Bars Reviewed International journal

    R. K. Biswas, M. Iwanami, N. Chijiwa, K. Uno

    2019.7

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  • Effect of Temperature Change on Structural Performance of Stainless Steel Reinforcing Concrete Structure Reviewed International journal

    Peerapong CHAROENKIJWATTANAKUL, Takaaki YAMAZAKI, Nobuhiro CHIJIWA

    Proceedings of 4th International Symposium on Concrete and Structures for Next Generation   456 - 465   2019.6

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  • Investigating the Mechanism of Shear Fatigue in Reinforced Concrete Beams subjected to Pulsating and Moving Loads using Digital Image Correlation International journal

    Benny Suryanto, Staniforth George, Kim Jaehwan, Gebreyouhannes Esayas, Chijiwa Nobuhiro, Fujiyama Chikako, Woodward Peter

    Proceedings of the International Conference on Sustainable Civil Engineering Structures and Construction Material   Vol. 258 ( No. 2 )   03015   2019.1

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    DOI: 10.1051/matecconf/201925803015

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  • THE INFLUENCE OF THE LIQUID WATER ON FATIGUE PERFORMANCE AT EMBEDDED JOINT OF CORROGATED STEEL WEB PC BRIDGE Reviewed International journal

    Youhei Ito, Nobuhiro Chijiwa

    2A - 5   2018.10

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  • Application of 2D micro-scale image analysis on concrete surface for evaluating concrete durability under various environments Reviewed International journal

    Tom Chlayon, Mitsuyasu Iwanami, Nobuhiro Chijiwa

    2018.10

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  • Investigation on mitigation of maintenance burden of pile-supported port structures based on structural analysis Reviewed International journal

    Sumire Nakamura, Nobuhiro Chijiwa, Mitsuyasu Iwanami

    Thailand Concrete Association Journal   Vol. 6 ( No. 2 )   41 - 48   2018.9

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  • Preconditioning effect on SEM concrete samples and its impact on the implementation of concrete surface analysis at microscopic scale Reviewed International journal

    Tom Chlayon, Nobuhiro Chijiwa, Mitsuyasu Iwanami

    Thailand Concrete Association Journal   Vol. 6 ( No. 2 )   1 - 6   2018.9

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  • The effect of localized main rebar corrosion on structural performance of RC beams subjected to reversed cyclic loading Reviewed

    Kana Tanaka, Nobuhiro Chijiwa, Mitsuyasu Iwanami

    2018.9

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  • 鉄筋腐食ひび割れを生じたRCはりのせん断疲労耐荷機構に及ぼすせん断補強筋の影響

    山田雄太, 千々和伸浩, 岩波光保

    土木学会論文集E2   Vol. 74 ( No. 3 )   176 - 191   2018.8

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    DOI: 10.2208/jscejmcs.74.176

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  • Combined protective action of barnacles and biofilm on concrete surface in intertidal areas Reviewed International journal

    Tom Chlayon, Mitsuyasu Iwanami, Nobuhiro Chijiwa

    Construction and Building Materials   Vol. 179   477 - 487   2018.8

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  • 周辺地盤と躯体間の相互作用変化を考慮した中柱式地中RCカルバートの損傷機構に関する検討 Reviewed

    米津薫, 千々和伸浩, 土屋智史

    コンクリート工学年次論文集   Vol. 40 ( No. 2 )   841 - 846   2018.7

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  • Effect of crack lengths along tensile rebars on shear fatigue behavior of RC beams International journal

    Yuta Yamada, Nobuhiro Chijiwa, Mitsuyasu Iwanami

    2018.6

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  • Application of GGBFS and Bentonite to Auto-Healing Cracks of Cement Paste Reviewed International journal

    J. J. Ekaputri, M. S. Anam, Y. Luan, C. Fujiyama, N. Chijiwa, D. H. E. Setiamarga

    Journal of Advanced Civil and Environmental Engineering   Vol. 1 ( No. 1 )   38 - 48   2018.4

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    DOI: 10.30659/jacee.1.1.38-48

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  • Estimation of Remaining Prestress in PC Structure by Using Expansion of Concrete by Water Absorption International journal

    Ryota KURIHARA, Nobuhiro CHIJIWA, Mitsuyasu IWANAMI

    86 - 91   2018.4

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  • Long-Term Differential and Averaged Deformation of Box-Type Pre-stressed Concrete Exposed to Natural Environment Reviewed International journal

    Nobuhiro Chijiwa, Shuntaro Hayasaka, Koichi Maekawa

    Journal of Advanced Concrete Technology   Vol. 16 ( No. 1 )   1 - 17   2018.1

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    DOI: 10.3151/jact.16.1

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  • Improvement of water penetration resistance of concrete-steel bond by pozzolanic materials and superabsorbent polymer Reviewed International journal

    C. Panitudom, M. Iwanami, N. Chijiwa

    2017.9

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  • Thermo-Hygral Analysis on Long-Term Natural Frequency of RC Buildings with Different Dimensions Reviewed International journal

    Ryota Kurihara, Nobuhiro Chijiwa, Koichi Maekawa

    Journal of Advanced Concrete Technology   Vol. 15 ( No. 8 )   381 - 396   2017.8

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    DOI: 10.3151/jact.15.381

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  • Evaluation of Residual Structural Performance of Steel Pipe Piled Pier with Local Steel Bar Corrosion Reviewed

    Kunihiko Uno, Nobuhiro Chijiwa, Mitsuyasu Iwanami, Toshiyasu Miyoshi, Tetsuya Ogasawara

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 73 ( No. 2 )   I_408 - I_413   2017.8

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    Steel pipe piled piers are exposed to severe corroding salty environment and they should be more appropriately maintained. However, few researches have been conducted on the residual structural and seismic performance of corroded piers. The objective of this study is to clarify the effect of corroded steel bar at the RC superstructure and the junction area between superstructure and the steel pipe on the structural performance of the entire pile-supported structure. This study has been developed through the laboratory loading tests and numerical analyses. From the experiment and analysis, it is confirmed that corrosion on the superstructure has impact on the residual structural performance. However, corrosion on the reinforcement bar in haunch has minor impact on the whole behavior.

    DOI: 10.2208/jscejoe.73.I_408

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  • 引張主鉄筋に沿う人工損傷の長さがせん断補強筋の無いRCはりの疲労耐荷機構に及ぼす影響 Reviewed

    山田雄太, 千々和伸浩, 岩波光保

    土木学会論文集E2   Vol. 73 ( No. 3 )   323 - 336   2017.8

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    DOI: 10.2208/jscejmcs.73.323

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  • 消波ブロック被覆堤の最下層に設置されるブロックに作用する上載荷重に関する実験的研究 Reviewed

    昇悟志, 久保田真一, 松本朗, 千々和伸浩, 岩波光保

    土木学会論文集B3   Vol. 73 ( No. 1 )   43 - 55   2017.7

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    DOI: 10.2208/jscejoe.73.43

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  • コンクリート中における電気浸透流に関する基礎的研究 Reviewed

    大塚邦朗, 岩波光保, 千々和伸浩

    コンクリート工学年次論文集   Vol. 39 ( No. 1 )   511 - 516   2017.7

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  • Shear creep failures of reinforced concrete slender beams without shear reinforcement Reviewed

    Saifullah, H.A., Nakarai, K., Piseth, V., Nobuhiro Chijiwa, Maekawa, K.

    ACI Structural Journal   Vol. 114 ( No. 6 )   1581 - 1590   2017

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    DOI: 10.14359/51700916

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  • Durability of concrete structure with attached marine growth in tidal zone Reviewed International journal

    T. Chlayon, M. Iwanami, N. Chijiwa:

    Proceedings of The Fifth International Symposium on Life -Cycle Civil Engineering (IALCCE2016)   2016.10

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  • SURCHARGE LOAD ACTING ON THE BLOCK SITTING IN THE BOTTOM-LAYER OF WAVE-DISSIPATING WORKS Reviewed

    Satoshi NOBORU, Shin-ichi KUBOTA, Akira MATSUMOTO, Nobuhiro CHIJIWA, Mitsuyasu IWANAMI

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 72 ( No. 2 )   I_235 - I_240   2016.8

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    DOI: 10.2208/jscejoe.72.I_235

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  • Shear fatigue load carrying mechanism of reinforced concrete beam with artificial cracks along tensile rebar Reviewed International journal

    Yuta Yamada, Nobuhiro Chijiwa, Mitsuyasu Iwanami

    The Proceedings of 11th fib International PhD Symposium in Civil Engineering   111 - 117   2016.8

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  • 消波工の最下層に設置される消波ブロックの曲げ耐荷力評価に関する基礎的研究 Reviewed

    昇悟志, 千々和伸浩, 岩波光保

    コンクリート工学年次論文集   Vol. 38 ( No. 2 )   559 - 564   2016.7

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  • Mechanism of Long-Term Excessive Deformation and Delayed Shear Failure of Underground RC Box Culverts Reviewed International journal

    Maekawa, K., Zhu, X., Chijiwa, N., Tanabe, S.

    Journal of Advanced Concrete Technology   Vol. 14 ( No. 6 )   183 - 204   2016.5

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    DOI: 10.3151/jact.14.183

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  • Multi-scale seismic simulation of RC building coupled with drying shrinkage and steel corrosion Reviewed International journal

    Maekawa, K., Chijiwa, N.

    9th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-9)   2016.5

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  • Analytical Evaluation for Shear Fatigue Load Carrying Behaviour of Cracked RC Beams based on the Load Path Reviewed International journal

    Yuta Yamada, Nobuhiro Chijiwa, Mitsuyasu Iwanami

    Proceedings of the International Symposium on Concrete and Structures for Next Generation (IOS2016)   125 - 130   2016.5

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  • Mechanism of rapid deterioration of the anchor performance of wind turbine foundation and effective countermeasures International journal

    Nobuhiro Chijiwa, Hong Thi Mai, Mitsuyasu Iwanami

    2016.2

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  • Effect of water supply on pull-out failure of deformed bars in concrete and ECC under fatigue loading Reviewed International journal

    Hirofumi Yamaguchi, Kohei Nagai, Koji Matsumoto, Nobuhiro Chijiwa

    Proc. of 14th East Asian Conference on Structural Engineering and Construction (EASEC-14)   06.194   2016.1

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  • Effect of loading conditions on shear creep failure of RC beams Reviewed International journal

    Saifullah, H.A., Nakarai, K., Piseth, V., Nobuhiro Chijiwa, Maekawa, K.

    Proceedings of the 11th fib International PhD Symposium in Civil Engineering, FIB 2016   125 - 132   2016

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  • 3D NONLINEAR FINITE ELEMENT SEISMIC ANALYSES OF IN-GROUND LNG TANKS AND SURROUNDING SOIL Reviewed

    Satoshi TSUCHIYA, Nobuhiro CHIJIWA, Mitsuo HARADA, Tetsuya MISHIMA, Koichi MAEKAWA

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))   Vol. 71 ( No. 3 )   429 - 448   2015.12

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    DOI: 10.2208/jscejseee.71.429

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  • Shear Fatigue Load Carrying Mechanism of Reinforced Concrete Beams with Corrosion Cracks along Longitudinal Rebars Reviewed International journal

    Y. Yamada, N. Chijiwa, M. Iwanami

    Proceedings of the 7th Regional Symposium on Infrastructure Development   Vol. 20 ( No. 7 )   62 - 65   2015.11

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  • Development of a New Simple Method to Evaluate the Remaining Pre-Stress in PC Structures Reviewed International journal

    S. Hayasaka, N. Chijiwa, M. Iwanami

    Proceedings of the 7th Regional Symposium on Infrastructure Development   Vol. 20 ( No. 7 )   84 - 87   2015.11

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  • Concrete Spalling Damage Evaluation to Third-Party for Rational Design and Maintenance of Concrete Structures Reviewed International journal

    M. Nishiwaki, N. Chijiwa, M. Iwanami

    Proceedings of the 7th Regional Symposium on Infrastructure Development   Vol. 20 ( No. 7 )   88 - 91   2015.11

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  • Rapid Deterioration of the Anchor Performance of the Wind Turbine Caused by Liquid Water Reviewed International journal

    N. Chijiwa, H. T. Mai, M. Iwanami

    Proceedings of the 7th Regional Symposium on Infrastructure Development   Vol. 20 ( No. 7 )   80 - 83   2015.11

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    In some wind turbines, it is found that sludge spouting on the tower foundation and the tower is lifted up just after several months have passed from starting service. Common characteristic of those wind turbine towers is that they are anchored to the foundation by anchor ring method. In anchor ring method, ring-shaped base plate welded to the wind turbine tower is expected to act as anchor in the foundation. It is suspected that liquid water may have some effect on such a kind of the anchor system. In this research, the experiments with concrete foundation model is carried out to clarify the mechanism of deterioration of the anchoring performance. The influence of the liquid water, bond between foundation concrete and turbine tower, poredistribution of foundation concrete, and loading speed on the anchoring performance under cyclic loading is investigated. After liquid water ingresses to the foundation through the interface between foundation concrete and turbine tower, the anchoring performance is rapidly deteriorated. Even when the bond between foundation concrete and turbine tower is originally sound, liquid water can ingress to the foundation, and rapid deterioration is caused. Because the pore distribution of the foundation concrete and the loading speed have some influence on the deterioration process, it is concluded that the viscous character of the liquid water acts important role on this deterioration process. Under the existence of water, deterioration is accelerated by water wedge effect, erosion with crushed particle, and cavitation erosion. The flow of water has also act important role on the deterioration process because it keeps undamaged concrete surface of the foundation concrete directly contacting to the anchor plate. Based on the knowledge on the deterioration process, rational countermeasures on design and maintenance are proposed.

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  • Rapid Degradation of Concrete Anchorage Performance by Liquid Water Reviewed International journal

    Nobuhiro Chijiwa, Hong Thi Mai, Mitsuyasu Iwanami, Tomohisa Saito, Atsushi Yamaya, Hiroyuki Motegi, Hiroo Shinozaki

    Journal of Advanced Concrete Technology   Vol. 13 ( No. 10 )   438 - 448   2015.10

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    Sludge ejection from the foundation of a wind turbine tower fixed by the anchor-ring method and the resulting sludge buildup have been confirmed to cause the undesirable phenomenon of lifting of the tower. Using specimen that is a pirtial model of the wind turbine foundation, this study investigates the influence of liquid water, differences in W/C, and differences in loading speed, to analyze developing factors on the concrete damage . The results shows that penetration of liquid water from rainfall and snowfall produces a wedge effect, breakdown of the concrete pore skeleton structure, grinding by sludge particle, cavitation and other effects, and leads to rapid deterioration of the anchorage performance of concrete foundation. Based on the knowledge on the deterioration process, rational countermeasures on design and maintenance are proposed.

    DOI: 10.3151/jact.13.438

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  • Thermo-Hygral Case-Study on Full Scale RC Building under Corrosive Environment and Seismic Actions Reviewed International journal

    Nobuhiro Chijiwa, Koichi Maekawa

    Journal of Advanced Concrete Technology   Vol. 13 ( No. 10 )   465 - 478   2015.10

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    This paper is to apply the multi-scale thermo-hygro-mechanistic modeling to full-scale RC structural systems under combined long-term ambient and short seismic actions. The authors also aim to dissolve numerical difficulty for full-scale performance assessment of huge degree-of-freedom. First, the multi-scale modeling is experimentally checked by using corroded RC columns under high axial compression. Second, the steel corrosion is computationally reproduced to a multi-story RC building under long-term fictitious ambient conditions. The seismic ground motion is subsequently applied to the corrosion damaged mockup. Beforehand, the effect of drying shrinkage, which is inevitable for structural concrete in air, is discussed so as to clarify the pure corrosion impact to the whole structural system. The steel corrosion deteriorates the ductility of seismic resistant members, but as a global influence, steel corrosion is validated to reduce the base-shear input of floors owing to the decayed stiffness by corrosion. Through these case-studies, the authors raise the points of discussion to take into account the local and global effects of corrosion all at once for seismic performance assessment, and that the knowledge solely on the capacity of corroded RC members cannot lead to an engineering solution.

    DOI: 10.3151/jact.13.465

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  • EVALUATION OF SEISMIC PERFORMANCE OF PILE-SUPPORTED STRUCTURE WITH LOCAL STEEL BAR CORROSION AND PROPOSAL OF ITS MAINTENANCE METHOD Reviewed

    NOMURA Sanami, CHIJIWA Nobuhiro, IWANAMI Mitsuyasu, MIYOSHI Toshiyasu, OGASAWARA Tetsuya, UNO Kunihiko

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 71 ( No. 2 )   173 - 178   2015.9

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    The objective of this study is to analytically clarify the effect of steel bar corrosion on the seismic performance of the entire pile-supported structure, and to then propose an appropriate maintenance method for pile-supported structures with steel bar corrosion, based on the analytical results.<br> First, a steel corrosion model using RC beams was proposed and verified. Then, the structural performance of the corroded RC beams was analyzed. Concurrently, loading experiments of the RC beams were conducted to verify the analyses. After confirming the validity of the analysis, the constitutive law of RC beams with various corrosion patterns was calculated by cyclic loading analysis. The seismic performance of the pile-supported structure with several combinations of this constitutive law was analyzed to clarify the relationship between local steel bar corrosion and the seismic performance of the whole structure. Finally, an appropriate maintenance method was proposed based on the analytical results.

    DOI: 10.2208/jscejoe.71.I_173

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  • 高水圧作用下におけるコンクリートの破壊挙動に関する基礎的研究 Reviewed

    堀尚, 千々和伸浩, 岩波光保

    土木学会論文集B3(海洋開発)   Vol. 71 ( No. 2 )   179 - 184   2015.9

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    DOI: 10.2208/jscejoe.71.I_179

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  • 軸方向鉄筋に沿う鉄筋腐食ひび割れを有する鉄筋コンクリートはりのせん断疲労耐荷機構

    山田雄太, 千々和伸浩, 岩波光保

    コンクリート技術シリーズNo.109 鉄筋コンクリート構造の疲労破壊 -破壊機構と性能評価の将来像を探る-   395 - 398   2015.9

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  • 液状水によるコンクリート中の鋼材定着性能の劣化加速機構とその予防策

    千々和伸浩, MAI Thi Hong, 岩波光保, 齊藤智久, 山谷敦, 茂木寛之, 篠崎裕生

    コンクリート技術シリーズNo.109 鉄筋コンクリート構造の疲労破壊 -破壊機構と性能評価の将来像を探る-   443 - 450   2015.9

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  • Delayed Shear Crack Formation of Shallow RC Box Culverts in Service International journal

    N. Chijiwa, X. Zhu, H. Ohno, S. Tanabe, K. Nakarai, K. Maekawa

    Mechanics and Physics of Creep, Shrinkage and Durability of Concrete and Concrete Structures (CONCREEP-10)   1579 - 1586   2015.9

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  • Experimental Study on Effects of Loading Rate on the Shear Performance of RC Beam International journal

    Van Piseth, K. Nakarai, N. Chijiwa, K. Maekawa

    Mechanics and Physics of Creep, Shrinkage and Durability of Concrete and Concrete Structures (CONCREEP-10)   1561 - 1569   2015.9

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  • 外来液状水がコンクリートおよびひずみ硬化型セメント系複合材料中の異形鉄筋の疲労引抜き性状に及ぼす影響

    松本浩嗣, 山口寛史, 長井宏平, 千々和伸浩

    コンクリート技術シリーズNo.109 鉄筋コンクリート構造の疲労破壊 -破壊機構と性能評価の将来像を探る-   437 - 442   2015.9

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  • Effect of Crack Length on Shear Fatigue Mechanism of RC beam with Cracks in Shear Span Reviewed

    Yuta Yamada, Nobuhiro Chijiwa, Mitsuyasu Iwanami

    Proceedings of JCI   Vol. 37 ( No. 2 )   643 - 648   2015.7

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  • Elucidation of mechanism of concrete damage progress around anchoring in the foundation of wind turbine due to liquid water Reviewed

    Mai Thi Hong, Nobuhiro Chijiwa, Mitsuyasu Iwanami, Tomoshisa Saito

    Proceedings of JCI   Vol. 37 ( No. 2 )   481 - 486   2015.7

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  • Examination and Evaluation of the Installation Method of Chloride Ion Monitoring Sensors Intended for use within Bored Holes of Existing Concrete Structures Reviewed

    Keisuke Shinohara, Nobuhiro Chijiwa, Mitsuyasu Iwanami, Tatsuzou Satou

    Proceedings of JCI   Vol. 37 ( No. 1 )   925 - 930   2015.7

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  • Shear fatigue mechanism of reinforced concrete beams with cracks due to rebar corrosion Reviewed International journal

    Y. Yamada, M. Iwanami, N. Chijiwa

    Life-Cycle of Structural Systems   1491 - 1499,   2014.11

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  • A Study on moisture transfer through boundary surface of concrete affected by air turbulence Reviewed International journal

    Masahiro Nishiwaki, Nobuhiro Chijiwa, Mitsuyasu Iwanami

    Proceedings of the Second International Conference on Advances in Structural and Environmental Engineering (ACSEE 2014)   153 - 160   2014.10

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  • Shear fatigue mechanism of reinforced concrete beams with cracks due to rebar corrosion International journal

    Yuta Yamada, Nobuhiro Chijiwa, Mitsuyasu Iwanami

    Proceedings of the 6th Multidisciplinary International Student Workshop (MISW2014)   2014.8

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  • セメント硬化体の時間依存変形に及ぼす気象作用の影響評価 Reviewed

    早坂駿太郎, 千々和伸浩, 岩波光保

    コンクリート工学年次論文集   Vol. 36 ( No. 1 )   436 - 441   2014.7

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  • Multiscale Coupled-Hygromechanistic Approach to the Life-Cycle Performance Assessment of Structural Concrete Reviewed International journal

    K. Maekawa, T. Ishida, N. Chijiwa, C. Fujiyama

    Journal of Material in Civil Engineering   Vol. 27 ( No. 2 )   A4014003-1~A4014003-9   2013.12

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    DOI: 10.1061/(ASCE)MT.1943-5533.0000984

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  • Long-term Deformational Simulation of PC Bridges Based on the Thermo-hygro Model of Micro-pores in Cementitious Composites

    Nobuhiro Chijiwa, Mitsuyasu Iwanami

    Tokyo Tech-KU Joint Seminar on Infrastructure Development   43 - 52   2013.10

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  • Analytical Evaluation on Structural Seismic Performance of Corroded RC Columns Subjected to Higher Axial Compression Reviewed International journal

    K. Shibata, H. Homma, N. Chijiwa, K. Maekawa

    EASEC-13   G-1-3   2013.9

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  • Feasibility study of autonomous deformation control of PC viaducts Reviewed International journal

    M. Kunieda, N. Chijiwa, K. Ohara, K. Maekawa

    From Materials to Structures: Advancement through Innovation   313 - 318   2012.11

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  • Integrated Earthquake Simulation International journal

    Nobuhiro CHIJIWA, Lalith MADDEGEDARA

    Journal of Asian Urbanism   ( No. 7 )   6 - 7   2012.9

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  • Microstructure based life-cycle assessment and durability design of concrete bridges, Second International Conference on Microstructural-related Durability of Cementitious Composites Reviewed International journal

    Koichi Maekawa, Benny Suryanto, Chikako Fujiyama, Nobuhiro Chijiwa

    244 - 248   2012.4

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  • An Investigation into the Long-Term Excessive Deflection of PC Viaducts by Using 3D Multi-scale Integrated Analysis Reviewed International journal

    Motohiro Ohno, Nobuhiro Chijiwa, Benny Suryanto, Koichi Maekawa

    Journal of Advanced Concrete Technology   Vol. 10 ( No. 2 )   47 - 58   2012.2

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    DOI: 10.3151/jact.10.47

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  • Multi-scale and multi-chemo-mechanistic approach to the lifecycle performance assessment of strucural concrete Reviewed International journal

    Maekawa, K., Ishida, T., Chijiwa, N., Fujiyama, C., Gebreyouhannes, E.

    Proc. 1st Int. Conf. on Performance-based and Life-cycle Structural Engineering   15 - 25   2012

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  • Multi-scale simulation of thermo-hygro mechanics on RC-PC structures under long-term actions Reviewed International journal

    K. Maekawa, N. Chijiwa, G. Esayas

    1 - 24   2011.11

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  • Structural performance assessment and strengthening method of RC with corrosion crack at the anchorage zone Reviewed International journal

    Nobuhiro Chijiwa, Koichi Maekawa

    The 2011 World Congress on Advances in Structural Engineering and Mechanics (ASEM'11+)   4813~4822   2011.9

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  • コンクリート中の細孔水に起因する変形駆動力が実PC橋の長期クリープたわみに及ぼす影響 Reviewed

    大野元寛, 千々和伸浩, 前川宏一

    コンクリート工学年次論文集   Vol. 33   467 - 472   2011.7

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  • Long-term deformational simulation of PC bridges based on the thermo-hygro model of micro-pores in cementitious composites Reviewed International journal

    Koichi Maekawa, Nobuhiro Chijiwa, Tetsuya Ishida

    Cement and Concrete Research   Vol. 41 ( No. 12 )   1310 - 1319   2011.5

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    DOI: 10.1016/j.cemconres.2011.03.021

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  • 引張鉄筋定着部に腐食劣化を有するRC梁の残存耐力と未損傷領域への面的補強 Reviewed

    千々和伸浩, 川中勲, 前川宏一

    土木学会論文集E2(材料・コンクリート構造)   Vol. 67 ( No. 2 )   160 - 165   2011.4

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    DOI: 10.2208/jscejmcs.67.160

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  • 都市の再構築・縮退戦略としてのごみ焼却施設の休廃止とコンポスト施設導入におけるCO2および費用便益分析 Reviewed

    北垣亮馬, 千々和伸浩, 石倉智樹, 川本陽一, 酒井宏治, 金森亮, 相尚寿

    318 - 319   2011.3

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  • セメント硬化体中の微視的機構モデルに基づく実PC橋の長期時間依存変形シミュレーション Reviewed

    千々和伸浩, 杉田恵, 石田 哲也, 前川宏一

    コンクリート工学年次論文集   Vol. 32   407 - 412   2010.7

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  • Simulation of long-term time-dependent mechanics of an existing PC bridge by full-3D multi-scale integrated FE analysis Reviewed International journal

    Nobuhiro Chijiwa, Kei Sugita, Tetsuya Ishida, Koichi Maekawa

    CONMOD2010   4 pages in CD   2010.6

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  • 未損傷部への選択的な鉄筋配置が定着部損傷を有するRC部材の耐荷機構に及ぼす影響 Reviewed

    千々和伸浩, 川中勲, 前川宏一

    土木学会論文集E   Vol. 66 ( No. 2 )   179 - 192   2010.5

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    DOI: 10.2208/jsceje.66.179

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  • Safety assessment of structural concrete with corrosion induced cracking around anchorage zones Reviewed International journal

    N. Chijiwa, K. Maekawa

    8 pages in CD   2010.5

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  • Simulation of long-term time-dependent mechanics of an existing PC bridge by full-3D multi-scale integrated FE analysis International journal

    Kei Sugita, Nobuhiro Chijiwa, Koichi Maekawa

    Society for Social Management Systems 2010 (SSMS 2010)   10   2010.3

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  • 無損傷領域に繊維シート材料を配置した予防的先行補強の効果 Reviewed

    川中勲, 千々和伸浩, 前川宏一

    コンクリート工学年次論文集   Vol. 31 ( No. 2 )   1405 - 1410   2009.7

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  • Structural Performance Assessment and Strengthening of Reinforced Concrete with Damaged Anchorage

    Nobuhiro Chijiwa

    2009.3

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  • 定着部に損傷を有するRC部材に対する予防的先行補強 Reviewed

    千々和伸浩, 川中勲, 前川宏一

    コンクリート工学年次論文報告集   Vol. 31 ( No. 2 )   1399 - 1404   2009

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  • Rational retrofitting method for reinforced concrete with damage at anchorages zones Reviewed International journal

    N. Chijiwa

    Conference Proceedings of 7th International PhD Symposium in Civil Engineering   Chapter 12, pp.3 - 14   2008.9

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  • Shear Fatigue Simulation of RC Beams Subjected to Fixed Pulsating and Moving Loads Reviewed International journal

    Esayas Gebreyouhannes, Nobuhiro Chijiwa, Chikako Fujiyama, Koichi Maekawa

    Jornal of Advanced Concrete Technology   Vol. 6 ( No. 1 )   215 - 226   2008.3

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    DOI: 10.3151/jact.6.215

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  • 移動荷重と水分の影響を同時に受けるRC部材の疲労破壊特性 Reviewed

    藤山知加子, 千々和伸浩, 川中勲, 前川宏一

    コンクリート工学年次論文集   Vol. 30   883 - 888   2008

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  • 定着部に損傷を有するRC梁への限定的補強の効果に関する研究 Reviewed

    千々和伸浩, 川中勲, 商峰, 前川宏一

    コンクリート工学年次論文集   Vol. 30   1639 - 1644   2008

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  • Durability Mechanics and Life-Time Assessment of Reinforced Concrete under Combined Moisture and Fatigue Loading Reviewed International journal

    K. Maekawa, E. Gebreyouhannes, C. Fujiyama, N. Chijiwa

    2008

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  • 初期損傷ならびに周辺設備の影響を受けるコンクリート構造物の耐震性に関する研究

    千々和伸浩, BONGOCHGETSAKUL Nattakorn, GEBREYOUHANNES Esayas, 半井健一郎, 前川宏一

    活褶曲地帯における防災シンポジウム 2004年新潟県中越地震被害の科学的調査今後の課題・対策への提言 講演概要集   45 - 49   2008

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  • 移動荷重下の床版疲労寿命に影響を及ぼす各種要因の数値解析に基づく分析 Reviewed

    藤山知加子, GEBREYOUHANNES Esayas, 千々和伸浩, 前川宏一

    コンクリート工学年次論文集   Vol. 29   727 - 732   2007.7

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  • 定着部に損傷を有するRC梁のせん断耐荷機構 Reviewed

    千々和伸浩, GEBREYOUHANNES Esayas, 藤山知加子, 前川宏一

    コンクリート工学年次論文集   Vol. 29 ( No. 3 )   709 - 714   2007.7

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  • Fatigue Behavior of RC Beams under Fixed Pulsating and Moving Loads Reviewed

    Esayas Gebreyouhannes, Nobuhiro Chijiwa, Chikako Fujiyama, Koichi Maekawa

    Vol. 29   733 - 738   2007.7

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  • Computational Life-cycle Assessment of Structural Concrete Subjected to Coupled Severe Environmental and Mechanistic Actions Reviewed International journal

    K. Maekawa, T. Ishida, N. Chijiwa

    CONSEC'07   Volume 1   3 - 18   2007.6

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  • 初期損傷ならびに周辺設備の影響を受けるコンクリート構造物の耐震性に関する研究

    千々和伸浩, BONGOCHGETSAKUL Nattakorn, 半井健一郎, 前川宏一

    活褶曲地帯における防災シンポジウム 2004年新潟県中越地震被害の科学的調査今後の課題・対策への提言 講演概要集   72 - 85   2007

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  • マルチスケール統合解析システムによる腐食ひび割れと物質移動

    前川宏一, 半井健一郎, 千々和伸浩, TOONGOENTHONG Kukrit

    コンクリート構造物の耐久性力学 : 耐久性力学WG報告書・耐久性力学に関するシンポジウム論文集   337 - 346   2007

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  • Multi-chemo physical approach to life-cycle assessment of structural concrete Reviewed International journal

    K. Maekawa, G. Esayas, N. Chijiwa

    19th Australasian Conference on the Mechanics of Structures and Materials   915 - 923   2006.11

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  • Time dependent simulation of reinforced concrete subjected to coupled mechanistic and environmental actions Reviewed International journal

    N. Chijiwa

    Proceeding of 6th International PhD Symposium in Civil Engineering   40 - 42   2006.8

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  • 遺伝子組み換え微生物を用いたコンクリート解体法の開発

    千々和伸浩

    2006.3

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  • 曲げモーメントを受ける鉄筋コンクリート部材の限界状態に関する検討 Reviewed

    桑野仁成 , 吉田英二 , 中村英佑 , 千々和伸浩   47 ( 2 )   241 - 246   2005.7

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  • 画像処理を用いたケーブル動的挙動の計測

    千々和伸浩

    2004.3

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  • 画像処理を用いたケーブル動的挙動の計測

    千々和伸浩, 熊野史朗, 藤野陽三

    第20回宇宙構造・材料シンポジウム   82 - 84   2004

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MISC

  • 水想 Invited

    千々和伸浩

    水循環 貯留と浸透   138   2 - 2   2026.7

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  • 新たな社会への挑戦-大田区の橋梁長寿命化への取組み-

    後藤幹尚, 門馬真帆, 多和田俊介, 関和彦, 千々和伸浩, 岩波光保

    橋梁と基礎   60   23 - 28   2026.3

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  • 防食被覆層の施工がコンクリート硫酸腐食抑制効果に与える影響

    千々和伸浩, 今井隆太, 藤井学, 藤澤健一, 倉田知一

    防水ジャーナル   Vol. 56 ( No. 8 )   50 - 55   2025.8

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  • PC跨道橋で生じている課題たわみ発生機構の解明

    千々和伸浩, 大橋夏樹, 吉野通範, 菊地新平

    プレストレストコンクリート   Vol. 67 ( No. 3 )   2025.5

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  • PC 技術者の化学入門 第4回 コンクリートの収縮・クリープ

    千々和伸浩

    プレストレストコンクリート   Vol. 65 ( No. 6 )   2023.11

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  • スコットランドから見た日本のインフラ維持管理

    千々和伸浩

    コンクリート工学   Vol. 58 ( No. 4 )   2020.4

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    DOI: 10.3151/coj.58.4_310

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  • コンクリート工学の最新トピック

    千々和伸浩

    地質工学   Vol. 14   29 - 34   2017.1

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  • 関東支部若手会21の活動

    千々和伸浩

    コンクリート工学   Vol. 55 ( No. 1 )   54 - 55   2017.1

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    DOI: 10.3151/coj.55.1_54

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  • インフラの維持管理 1)構造物

    千々和伸浩

    Sustainable Urban Regeneration, Center for Sustainable Urban Regeneration, The University of Tokyo   Vol. 31   11 - 12   2013.3

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  • Part2 Stock/第5回 構造物

    千々和伸浩

    Sustainable Urban Regeneration, Center for Sustainable Urban Regeneration, The University of Tokyo   Vol. 30   32 - 37   2013.3

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  • 統合シミュレータにおける建物地震応答解析

    千々和伸浩, 壁谷澤寿一

    Sustainable Urban Regeneration, Center for Sustainable Urban Regeneration, The University of Tokyo   Vol. 28   8 - 11   2013.2

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  • 大規模解析に向けた劣化構造物の残存構造評価手法

    千々和伸浩

    Sustainable Urban Regeneration, Center for Sustainable Urban Regeneration, The University of Tokyo   Vol. 28   12 - 15   2013.2

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  • コンクリートの微細空隙中の水分とPC橋の長期変位

    千々和伸浩, 石田哲也, 前川宏一

    橋梁と基礎   Vol. 45 ( No. 1 )   2011.1

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Presentations

  • The effect of specimen size and the number of exposed surfaces on the drying shrinkage of concrete International conference

    Natsuki Ohashi, Carolina Melendez, Graça Vasconcelos, Miguel Azenha, Nobuhiro Chijiwa

    the 3rd International Conference on Moisture in Buildings (ICMB)  2025.10 

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    Event date: 2025.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Guimarães  

    Recently, unexpected deformations have been reported in concrete structures due to shrinkage and creep. These deformations have been attributed to non-uniform moisture conditions within the cross-section. Although current design specifications account for drying shrinkage using uniform coefficients, they do not reflect internal moisture variations. To address this limitation, this study experimentally investigates drying shrinkage behavior. Mortar specimens of two sizes were prepared, with four surfaces of each specimen sealed to simulate non-uniform moisture conditions. A specimen with two surface seals was also prepared for comparison. All specimens were placed in a controlled environment, and axial strains at both the surface and interior were measured. The results revealed differences in strain depending on measurement position, confirming that non-uniform shrinkage developed within a single cross-section.

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  • Effect of Bond Loss Region Due to PC Cable Rupture on the Residual Structural Performance of PC Girders International conference

    Nobuhiro CHIJIWA

    2024 Taiwan-Japan Joint Symposium on the Advancement of Urban Earthquake Hazard Mitigation Technology  2024.9 

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    Event date: 2024.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Taoyuan  

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  • Experimental Investigation of the Effects of Steel Reinforcement Section Loss and Bond Loss Due to Corrosion and Concrete Spalling on RC Structural Performance International conference

    K.D. Cabatit, N. Chijiwa

    15th Multidisciplinary International Student Workshop 2024 (MISW2024)  2024.8 

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    Event date: 2024.8

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    Venue:Tokyo  

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  • Assessment of the Influence of Joint Characteristics on Long-Term Time-Dependent Deformation in Steel-Concrete Hybrid Girders Using Numerical Analysis International conference

    Nobuhiro Chijiwa, Wang Yiwen, Takumi Shimomura

    Concreep12 conference  2024.6 

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    Event date: 2024.6

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    Venue:Delft  

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  • Development of New Concrete Building Material with Excellent Radio Wave Permeability International conference

    R. Sakamoto, N. Chijiwa, K. Saito, K. Nakayama

    14th Multidisciplinary International Student Workshop 2023  2023.8 

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    Event date: 2023.8

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    Venue:Tokyo  

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  • Analytical Study on the Cause Mechanism of Excessive Deflection Occurred at a π-Shaped Rigid Frame Bridge with PC Diagonal Members International conference

    N. Ohashi, N. Chijiwa, M. Yoshino, S. Kikuchi

    14th Multidisciplinary International Student Workshop 2023  2023.8 

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    Venue:Tokyo  

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  • Shear fatigue behavior of geopolymer concrete beams

    Rentaro Uchinishi, Nobuhiro Chijiwa

    2022.9 

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    Venue:Kyoto  

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  • 高炉スラグ細骨材を用いたRCはりのせん断耐力評価

    山崎隆朗, 木原亮太, 千々和伸浩

    第45回土木学会関東支部技術研究発表会  2018.3 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山梨  

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  • 東京都特別区における橋梁の維持管理マネジメントに関する問題分析と解決策の提案

    千々和 伸浩, 岩波 光保, 森木 美沙樹, 齋藤 亮太, 後藤 幹尚, 齊藤 武司

    土木学会第72回年次学術講演会  2017.9 

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    Event date: 2017.9

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    Venue:福岡  

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  • コンクリート中の鉄筋腐食を考慮した構造解析に基づく桟橋の維持管理の負担軽減に関する検討

    中村 菫, 千々和 伸浩, 岩波 光保

    土木学会第72回年次学術講演会  2017.9 

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    Venue:福岡  

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  • 地中RC ボックスカルバートの遅れせん断ひび割れ発生機構に関する検討

    木原 亮太, 千々和 伸浩, 洪 汶宜

    土木学会第72回年次学術講演会  2017.9 

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    Venue:福岡  

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  • 建設プロセスを活用した人材育成の取り組みについて

    栗原遼大, 小田切勝也, 木原亮太, 中村菫, 千々和伸浩, 岩波光保, 合屋力, 杉島貴史, 高橋祐樹, 後藤幹尚, 齊藤武司, 野田顕, 大場千裕, 中村之信, 西本英生, 藤原寛和, 押川亮彦, 美藤友郎, 森敦, 幅野正紀, 相坂理, 金子順平, 掛川崇史, 内田篤貴

    土木学会第72回年次学術講演会  2017.9 

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    Venue:福岡  

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  • せん断補強されていない鉄筋コンクリートはりのせん断疲労耐荷挙動に及ぼす軸方向圧縮鉄筋に沿うひび割れの影響

    山田雄太, 千々和伸浩, 岩波光保

    土木学会第70回年次学術講演会  2015.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 剥落コンクリート衝突時の危険度判定に関する実験的研究

    西脇雅裕, 千々和伸浩, 岩波光保

    土木学会第70回年次学術講演会  2015.9 

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    Venue:岡山  

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  • 異形鉄筋の低応力疲労引抜け破壊に及ぼす水の供給の影響

    山口 寛史, 長井宏平, 松本浩嗣, 千々和伸浩

    土木学会第70回年次学術講演会  2015.9 

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    Venue:岡山  

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  • プレストレスの有無がコンクリート表面の吸水膨張に与える影響の基礎的検討

    早坂 駿太郎, 千々和伸浩, 岩波光保

    土木学会第70回年次学術講演会  2015.9 

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    Venue:岡山  

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  • PC-RC 構造の自律的時間依存変形制御に関する基礎的検討

    千々和伸浩, 國枝将大, 前川宏一

    平成25年度土木学会全国大会第68回年次学術講演会  2013.9 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉県習志野市  

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  • 液状水に起因した風車基礎アンカーリング周りのコンクリート疲労寿命に関する一考察

    茂木寛之, 千々和伸浩, 齊藤智久, 篠崎裕生

    土木学会第71回年次学術講演会  2016.9 

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  • 高波浪領域で使用される無筋コンクリート消波ブロックの曲げ耐荷力に関する基礎的研究

    昇悟志, 千々和伸浩, 岩波光保

    土木学会第71回年次学術講演会  2016.9 

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    Venue:仙台  

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  • 局所的な鉄筋腐食が交番載荷を受ける鉄筋コンクリートはりの構造性能に与える影響

    田中佳南, 千々和伸浩, 岩波光保

    土木学会第73回年次学術講演会  2018.8 

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    Venue:札幌  

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  • 液体金属とコンクリート材料の共存性に関する研究

    嘉納 悠生, 近藤 正聡, 千々和 伸浩, オ ミンホ, 玉井 芳江

    日本原子力学会 2020年春の年会  2020.3 

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    Venue:福島県  

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  • 中央ヒンジラーメン橋の長期的なクリープ計測

    今井 遥平, 永来 良吾, 千々和伸浩

    令和2年度土木学会全国大会  2020.9 

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  • 既設構造物腐食モニタリングのためのドリル孔挿入小型センサの開発

    篠原桂介, 岩波光保, 千々和伸浩, 江里口玲, 佐藤達三

    土木学会第69回年次学術講演会  2014.9 

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    Venue:大阪  

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  • 高水圧下におけるコンクリ―トの破壊挙動に関する実験的考察

    堀尚, 中村麻美, 千々和伸浩, 岩波光保

    土木学会第69回年次学術講演会  2014.9 

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    Venue:大阪  

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  • コンクリート構造物におけるひび割れ中のキャビテーションエロージョンの検知

    大塚邦朗, 千々和伸浩, 岩波光保

    土木学会第70回年次学術講演会  2015.9 

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    Venue:岡山  

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  • 画像処理を用いたケーブル動的挙動の計測

    千々和伸浩, 熊野史朗, 藤野陽三

    平成16年度土木学会全国大会第59回年次学術講演会  2004 

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    Venue:名古屋  

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  • セメント硬化体中の微視的機構モデルに基づく実PC橋の長期時間依存変形シミュレーション

    杉田恵, 千々和伸浩, 前川宏一

    土木学会第65回年次学術講演会  2010.9 

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    Venue:札幌  

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  • Surface Chloride Ion Charge and Diffusion Coefficient of Concrete in Bridge Substructures of Tidal Rivers

    Mikinao Goto, Mitsuyasu Iwanami, Nobuhiro Chijiwa, 津野 和宏

    2023.9 

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  • A Study of Efficient Methods of Skill Transfer in Organizations

    Nobuhiro Chijiwa, Reia Suzuki, Kazuhide Nakayama, Mitsuyasu Iwanami

    2023.9 

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  • 感潮河川にかかる橋梁における塩害の実態調査の取り組み(調査計画編)

    槇野ちひろ, 後藤幹尚, 川越貴水, 岩波光保, 千々和伸浩, 津野和宏

    土木学会第77回年次学術講演会  2022.9 

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    Venue:京都  

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  • 感潮河川にかかる橋梁における塩害の実態調査の取り組み(加振レーダ法による鉄筋腐食状況の非破壊試験編)

    三輪空司, 川上圭祐, 後藤幹尚, 槇野ちひろ, 岩波光保, 千々和伸浩, 津野和宏

    土木学会第77回年次学術講演会  2022.9 

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    Venue:京都  

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  • Mechanical Properties and Dynamic Bond Behavior for Plain Bars in PC-Tendon Grouting Mortar International conference

    I. Gkolfinopoulos, C. Nobuhiro

    1st International Conference on Durability, Repair and Maintenance of Structures  2023.3 

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    Venue:Porto  

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  • 感潮河川における塩害実態調査(鉄筋腐食状況の非破壊試験編)

    三輪 秀雄, 高鍋 雅則, 松浦 康博, 後藤 幹尚, 志村 航, 岩波光保, 千々和伸浩

    土木学会第76回年次学術講演会  2021.9 

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  • 感潮河川における塩害実態調査(コンクリートコアを用いた試験編)

    志村 航, 後藤 幹尚, 岩波光保, 千々和伸浩

    土木学会第76回年次学術講演会  2021.9 

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  • 次世代の橋梁長寿命化修繕計画の取り組み

    長瀬 祥敬, 後藤 幹尚, 岩波光保, 千々和伸浩

    土木学会第76回年次学術講演会  2021.9 

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  • 感潮河川における塩害実態調査(かぶりコンクリートのはく離状況の非破壊試験編)

    山上雅人, 岩野聡史, 後藤 幹尚, 志村 航, 岩波光保, 千々和伸浩

    土木学会第76回年次学術講演会  2021.9 

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  • 大田区の感潮河川に架かる橋梁の塩害実態調査-非破壊試験の適用事例-

    山上 雅人, 岩野 聡史, 後藤幹尚, 志村航, 岩波光保, 千々和伸浩

    第48回土木学会関東支部技術研究発表会  2021.3 

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  • 大田区における感潮河川の塩害実態調査と対策検討に向けた取り組みについて

    後藤幹尚, 志村航, 岩波光保, 千々和伸浩

    第48回土木学会関東支部技術研究発表会  2021.3 

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  • 様々な液体金属とセメント及びコンクリートの材料共存性に関する研究

    村上 勝也, 宮川 幸大, 嘉納 悠生, 千々和 伸浩, Minho O, 田中 照也, 近藤 正聡

    日本原子力学会2021年春の年会  2021.3 

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    Venue:オンライン  

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  • Effect of Temperature Change on Structural Performance of Stainless Steel Reinforced Concrete Structures International conference

    Charoenkijwattanakul Peerapong, Chijiwa Nobuhiro

    MISW 2021  2021.8 

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    Venue:Tokyo  

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  • Experimental study on chemical compatibility between liquid metals and concrete materials International conference

    Masatoshi Kondo, Katsuya Murakami, Yuki Kano, Yukihiro Miyakawa, Nobuhiro Chijiwa, Minho O, Teruya Tanaka

    20th International conference on fusion reactor materials (ICFRM-20)  2021.10 

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  • 感潮河川における塩害実態調査(鉄筋腐食状況の非破壊試験編その2)~次世代の橋梁長寿命化修繕計画の取り組み~

    高鍋雅則, 三輪秀雄, 松浦康博, 後藤幹尚, 槇野ちひろ, 岩波光保, 千々和伸浩, 津野和宏

    土木学会第77回年次学術講演会  2022.9 

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    Venue:京都  

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  • 高強度PC鋼材と超高強度繊維補強コンクリートを用いた中小河川における橋梁架替計画

    後藤幹尚, 槇野ちひろ, 岩波光保, 千々和伸浩, 津野和宏

    土木学会第77回年次学術講演会  2022.9 

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    Venue:京都  

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  • SDGs指標を優先評価した橋梁形式選定

    日和裕介, 木ノ本剛, 後藤幹尚, 後藤朋子, 岩波光保, 千々和伸浩

    土木学会第79回年次学術講演会  2024.9 

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    Venue:仙台  

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  • PCより線破断時に生じる素線間相互作用に関する解析的検討

    増井創大, 橋本龍一, 千々和伸浩, 栗原遼大

    令和6年度土木学会全国大会  2024.9 

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    Venue:仙台  

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  • カメラの解像度の違いによるひび割れの検出精度について

    藤森竣平, 後藤幹尚, 近藤冬東, 岩波光保, 千々和伸浩, 津野和宏

    土木学会第79回年次学術講演会  2024.9 

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    Venue:仙台  

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  • 目開きを有するプレキャストコンクリート接合部における打継目直角方向への塩分浸透

    田中宏武, 中山一秀, 千々和伸浩, 岩波光保

    令和6年度土木学会全国大会, V-756  2024.9 

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  • 都市の中小河川に架かる橋梁を対象とした橋梁点検への空中ドローンの適用について

    近藤冬東, 後藤幹尚, 藤森竣平, 岩波光保, 千々和伸浩, 津野和宏

    土木学会第79回年次学術講演会  2024.9 

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    Venue:仙台  

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  • 感潮河川に架かる橋梁を対象としたコンクリートコアの採取高さと採取面の違いによる各種試験結果への影響について

    後藤幹尚, 岩波光保, 千々和伸浩, 津野和宏

    土木学会第79回年次学術講演会  2024.9 

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    Venue:仙台  

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  • Parametric Study on Excessive Deflection in π-Shaped Rigid Frame Bridge with PC Diagonal Members International conference

    Natsuki Ohashi, Nobuhiro Chijiwa, Michinori Yoshino, Shinpei Kikuchi

    Concreep12 conference  2024.6 

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    Venue:Delft  

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  • Development of New Concrete Building Material with Excellent Radio Wave Permeability International conference

    Ryo Sakamoto, Nobuhiro Chijiwa, Kentaro Saito, Kazuhide Nakayama, CheChia Kang

    Joseph Aspdin 200 International Symposium, Innovations in Binder Technology  2024.7 

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    Venue:Scotland  

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  • Relation between electrical resistance and pore structure characteristics of early age geopolymer International conference

    Kazuhide Nakayama, Konoka Fujimoto, Shuji Nagaoka, Mitsuyasu Iwanami, Nobuhiro Chijiwa

    Joseph Aspdin 200 International Symposium, Innovations in Binder Technology  2024.7 

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    Venue:Scotland  

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  • Application Study on Salt Attack Survey of Reinforced Concrete by Non-destructive test for Preventive Maintenance (Part 5) - Study of the Impact of Corrosion Conditions on Structural Performance by Nonlinear Finite Element Analysis-

    Chikara Kouya, Yuto Suzuki, Nobuhiro Chijiwa, Mitsuyasu Iwanami, Kazuhito Tsuno, Mikinao Goto, Shunpei Fujimori

    2023.9 

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  • Efforts to create new value for bridges through collaboration with ward residents on maintenance

    Mikinao Goto, Tomoko Goto, Yoshinori Nagase, Shunsuke Tawada, Sara Takakura, Wakana Asano, Mitsuyasu Iwanami, Nobuhiro Chijiwa

    2023.9 

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  • Effect of cement on shrinkage properties of geopolymer

    Horhok Lim, Mitsuyasu Iwanami, Nobuhiro Chijiwa, Kazuhide Nakayama

    2023.9 

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  • Fundamental Study on Shear Transfer Model Considering Corrosion Cracking

    Ryota Kurihara, Nobuhiro Chijiwa

    2024.5 

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  • 近接する都市内橋梁の架替え及び補強設計におけるBIM/CIMの活用事例

    和田尚人, 木ノ本剛, 三森章太, 齋藤史弥, 後藤幹尚, 長瀬祥敬, 岩波光保, 千々和伸浩

    土木学会第79回年次学術講演会  2024.9 

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    Venue:仙台  

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Industrial property rights

  • 固化物、組成物、組成物の製造方法、及び固化物の製造方法

    千々和伸浩, 齋藤健太郎, 中山一秀, 坂本亮, 康哲嘉, 呂 卓揚

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    Applicant:国立大学法人東京科学大学

    Application no:特願2023-169183  Date applied:2023.9

    Announcement no:特開2025-059229  Date announced:2025.4

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  • 材料のリサイクルが可能な繊維補強コンクリート及びそのリサイクル方法

    千々和伸浩, 近藤正聡, OMinho, 矢部拓海, 井上京香, 昇 悟志

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    Applicant:国立大学法人東京工業大学, 株式会社不動テトラ

    Application no:特願2021-019707  Date applied:2021.2

    Announcement no:特開2021-187731  Date announced:2021.12

    Patent/Registration no:特許第7300681号  Date registered:2023.6 

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  • コンクリート部材と鋼材との接合構造及びその構築方法

    千々和伸浩, 篠崎 裕生, 齋藤 智久

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    Applicant:国立大学法人東京工業大学, 三井住友建設株式会社, 株式会社ユーラスエナジーホールディングス

    Application no:特願2017-218531  Date applied:2017.11

    Announcement no:特開2019-090198  Date announced:2019.6

    Patent/Registration no:特許第6853468号  Date registered:2021.3 

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  • 金属腐食因子検知ユニット及び金属腐食因子検知方法

    岩波光保, 千々和伸浩, 江里口 玲, 佐藤 達三

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    Applicant:国立大学法人東京工業大学, 太平洋セメント株式会社

    Application no:特願2015-117578  Date applied:2015.6

    Announcement no:特開2017-003428  Date announced:2017.1

    Patent/Registration no:特許第6600493号  Date registered:2019.10 

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Awards

  • コンクリート工学論文集2026年最優秀論文

    2026.5   日本コンクリート工学会   下水道施設における防食被覆材の長期供用環境下における劣化機構

    藤澤健一, 今井隆太, 千々和伸浩, 藤井学

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  • Best Paper Award

    2025.10   the Eighth International Conference on Durability of Concrete Structures (ICDCS 2025)  

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  • Best Paper Presentation

    2025.3   5th International Symposium on Concrete and Structures for the Next Generation (CSN2025)  

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  • インフラメンテナンス優秀論文賞

    2025.2   公益社団法人 土木学会  

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  • 大成学術財団選奨 銀賞

    2024.10   大成学術財団  

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  • インフラメンテナンス優秀論文賞

    2024.2   公益社団法人 土木学会  

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  • Journal of Advanced Concrete Technology, Outstanding Contribution in Reviewing (2022.8~2023.7)

    2023.10  

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  • インフラメンテナンス優秀論文賞

    2023.2   公益社団法人 土木学会  

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  • 論文賞

    2022.8   公益社団法人土木学会 建設マネジメント委員会  

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  • インフラメンテナンス優秀論文賞

    2022.3   公益社団法人 土木学会  

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  • 日本コンクリート工学会賞(論文賞)

    2016.6   日本コンクリート工学会  

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  • ACT three outstanding papers of the year

    2015.12   Japan Concrete Institute  

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  • 東工大工系若手奨励賞

    2015.9   東京工業大学  

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  • 東工大挑戦的研究賞

    2013.8   東京工業大学  

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  • 日本コンクリート工学会賞(論文賞)

    2013.6   日本コンクリート工学会  

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  • 吉田研究奨励賞

    2012.6   土木学会  

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  • コンクリート工学講演会 年次論文奨励賞

    2010.7   日本コンクリート工学協会  

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  • 日本コンクリート工学協会賞(論文賞)

    2009.5   日本コンクリート工学協会  

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  • コンクリート工学講演会 年次論文奨励賞

    2008.7   日本コンクリート工学協会  

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Research Projects

  • Operator learning-based data assimilation by image sensing for performance evaluations of locally damaged structures

    Grant number:26H02153  2026.4 - 2031.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Grant amount:\41600000 ( Direct Cost: \32000000 、 Indirect Cost:\9600000 )

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  • 港湾施設の劣化ならびに残存性能評価に関する解析検討、維持管理施策立案

    2023 - 2026

    Sponsored Research Program (Governmental)  戦略的イノベーション創造プログラム(SIP)

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  • 持続可能社会実現に貢献する縮重合反応を基本とする新しいアルカリ活性材料の開発

    Grant number:22H00230  2022.4 - 2026.3

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    一宮 一夫, 佐川 康貴, 山本 武志, 藤山 知加子, 千々和 伸浩

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    Grant amount:\43420000 ( Direct Cost: \33400000 、 Indirect Cost:\10020000 )

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  • 石灰石骨材コンクリートにおける微細ひび割れの発生制御と高性能化

    Grant number:22H01565  2022.4 - 2026.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    半井 健一郎, 小川 由布子, 千々和 伸浩, 佐川 孝広

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    Grant amount:\17290000 ( Direct Cost: \13300000 、 Indirect Cost:\3990000 )

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  • 石灰石骨材コンクリートにおける微細ひび割れの発生制御と高性能化

    Grant number:23K22835  2022.4 - 2026.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    半井 健一郎, 小川 由布子, 千々和 伸浩, 佐川 孝広

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    Grant amount:\17290000 ( Direct Cost: \13300000 、 Indirect Cost:\3990000 )

    本研究の目的は,微細ひび割れを構造と材料の複合問題としてとらえ,その発生機構を明らかにしたうえで,コンクリート構造物としての性能への影響を定量的かつ体系的に分析することで,性能向上のために微細ひび割れを積極的に導入する手法を確立することである.これにより,せん断耐力の低下によって構造安全性を低下させるという,石灰石骨材を用いたコンクリート構造物の課題を解決するとともに,材料設計と構造物の性能評価を直結させるものである.
    本年度は,まず,材料物性の化学反応の観点からの評価として,材齢初期からの膨張材の反応とそれに伴う拘束膨張ひずみの発現に関する分析結果について精査し,地球化学モデルを用いたエトリンガイト生成量との関係性について検討を行った.次に,膨張材の添加量を変化させた膨張コンクリートに関して,透気性の観点から,微細ひび割れと耐久性の関係を分析した.特に,鉄筋の配置による膨張の拘束方向の違いに加え,養生温度に着目した検討を行った.さらに,石灰石骨材膨張材コンクリートを用いたRCはり試験体を用い,過膨張によって生じた微細ひび割れが石灰石骨材によるせん断強度の低下・回復に及ぼす影響を,繰り返し載荷試験を用いて議論した.その結果,微細ひび割れの存在によって耐疲労抵抗性が向上する傾向の結果が得られた.また,静的載荷試験で得られるせん断耐力を破壊エネルギーの観点から評価する簡易手法についても検討を進めた.

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  • ジオポリマーコンクリートのクリープ試験装置の検討

    2022

    Sponsored Research Program  R4 副産物・廃棄物のみを主原料とする持続可能なジオポリマーコンクリートによる建設分野の脱炭素への取組

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  • Durability Mechanics of Cementitious Composites and Structural Performance under Broadband Environments

    Grant number:20H00260  2020.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Grant amount:\37960000 ( Direct Cost: \29200000 、 Indirect Cost:\8760000 )

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  • Analysis of micro-cracking of concrete and its applications

    Grant number:18H01512  2018.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Nakarai Kenichiro

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    Grant amount:\15210000 ( Direct Cost: \11700000 、 Indirect Cost:\3510000 )

    This study focused on micro-cracking in concrete and examined its effects on the material and structural performance. At the material level, experimental results varying the curing conditions and the used materials such as limestone aggregate, expansion material, and blast furnace slag cement showed that the concrete material properties can be explained by the reaction rate of each mineral, the amounts of reacted water and hydrates. At the structural level, loading tests were conducted on RC beams, and it was shown that limestone aggregate concrete subjected to an initial high-temperature history could develop micro-cracks, which could resolve the reduction in shear strength.

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  • Fracture progress mechanism of concrete under high water pressure considering water movement in microstructure

    Grant number:18H01508  2018.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Iwanami Mitsuyasu

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    Grant amount:\17030000 ( Direct Cost: \13100000 、 Indirect Cost:\3930000 )

    This study consisted of experimental investigation with high pressure loading apparatus and numerical investigation based on FEM. In the experiment, loading tests on concrete specimens with various shapes and materials were conducted using the high pressure loading apparatus. By changing the maximum water pressure, loading rate, repeated cycles, the strains in the specimen and its surface appearance were examined in order to make clear the fracture process of concrete under high water pressure. In the numerical investigation, utilizing the FEM analytical platform where the water transportation can be simulated in the micro-pore scale, the micro fracture process was examined to compensate the experimental approach.

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  • 東京都特別区における橋梁維持管理における課題抽出と持続的なアセットマネジメント体制の構築

    2017 - 2018

    Sponsored Research Program (Governmental)  戦略的イノベーション創造プログラム(SIP)

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  • Research on the influence of liquid water on fatigue deterioration of embedded joint in corrugated steel web PC bridge and development of effective countermeasures

    Grant number:16H06096  2016.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (A)

    Chijiwa Nobuhiro, IWANAMI Mitsuyasu, SASAKI Eiichi, TAMURA Hiroshi, SHINOZAKI Hiroo, SAITO Tomohisa, MAEKAWA Koichi

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    Grant amount:\25350000 ( Direct Cost: \19500000 、 Indirect Cost:\5850000 )

    This research aims to examine the possibility of rapid deterioration of anchorage performance of steel web embedded in the concrete flanges in steel corrugate web PC bridge due to the liquid state water, and propose some effective countermeasures for the problem. As a result of the research, it is confirmed that the risk of concerning problem is small. This is because the interface opening is confined by the pre-stressing force, and the water pressure of the interface is limited in low level due to the crack penetration through thin concrete flanges. It is also confirmed that the effectiveness of a new countermeasure with a special treatment on the interface between steel and concrete by suppressing local water pressure.

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  • Development of simple evaluation method of residual pre-stressing force in PC structure by using concrete expansion with water absorption

    Grant number:16K14289  2016.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    CHIJIWA Nobuhiro

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    Grant amount:\3770000 ( Direct Cost: \2900000 、 Indirect Cost:\870000 )

    Dried concrete expands by absorbing water, and this volumetric change of concrete can be confined by external pre-stressing force. We tried to develop simple evaluation method of residual pre-stressing force in PC structure by using this character.
    For small scale test specimens, it is confirmed that the volumetric change can be confined by external force in experiment and numerical analysis. However, in the experiment with the real scale test specimen, such a tendency can not be observed, though numerical analysis gives similar trends with small scale test. This difference may be caused by uneven water contents and microcracks in real scale test specimen.
    Applicability of image analysis to measure the volumetric change is also examined. It is found that quantity of light is important to get precise result.

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  • Development of biochemical demolishing method for concrete with genetically engineered microorganisms

    Grant number:24656268  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    CHIJIWA Nobuhiro, WATANABE Manabu

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    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    This research aims to develop new concrete demolishing method with the genetically engineered microorganisms which produces special chemicals to dissolve cement hydrate. Two independent demolishing systems with microorganisms are designed; one is based on hydrochloric acid and the other is based on nitric acid. The acid producing performance of genetically engineered microorganisms are checked, but the results show that the pH of each culture media does not decrease against expectations in each systems. It is found that the organ to carry the produced chemicals out of the microorganism body and the tolerance property to the produced chemical are requested for the genetically modified microorganisms.

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  • damage mechanism of bridge structures by huge tsunami and the proposal of countermeasures

    Grant number:24246079  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    MARUYAMA Kyuichi, ARIKAWA Taro, MIZUTANI Norimi, HAYASHI Kazuhiko, TANAKA Yasushi, WATANABE Ken, FUJIMA Koji, HOSODA Akira, CHIJIWA Nobuhiro, SHIGIHARA Yoshinori

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    Grant amount:\46280000 ( Direct Cost: \35600000 、 Indirect Cost:\10680000 )

    Acting force on bridge structures due to huge tsunami was studied through large scale hydraulic test, 3D computational fluid dynamics and tsunami wave propagation analysis. In addition to lift by staircase wave and solitary wave, hydrodynamic force both in steady and unsteady flow is evaluated quantitatively. Evaluation equation was verified with data set of bridge structures attacked by the 2011 off the Pacific coast of Tohoku Earthquak tsunami. Limitation of evaluation equation was also recognized.
    Computational fluid dynamic program which is able to simulate the movement of bridge structures was developed with use of coupling technique between solid, gas, and liquid phase. The effect of strengthening method is able to be evaluated by the AEM software which deals with fracture and large deformation of structures.

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  • Long-Term Dynamic Simulation of Large-Scale RC-PC Infrastructures Based on Quasi Thermo-hygral Modeling

    Grant number:23226011  2011.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    MAEKAWA KOICHI, ISHIDA Tetsuya, ISHIHARA Takeshi, MISHIMA Tetsuya, ISHIBASHI Tadayoshi, TANABE Shigeru, SAKATA Noboru

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    Grant amount:\224640000 ( Direct Cost: \172800000 、 Indirect Cost:\51840000 )

    By coupling micro-pore networks with nano-channel hydraulics, the hygral-mechanical model on thermodynamic equilibrium of moisture and momentum is upgraded. Rapid adsorption of rain and following evaporation can be accurately reproduced and the model is verified by the continuous monitoring of internal moisture and curvature of the box PC mockups exposed to natural environment. Long-term varying natural frequency of tall buildings and nuclear facilities is successfully simulated by the thermo-hygral model. Delayed shear failure of underground RC culverts was also simulated by the on-site existing facilities, and the remaining risk of failure can be estimated. A unified poro-mechanics with ASR silica & corrosion gels and condensed-ice is established with strong full coupling. Based upon the simulation platform as mention above, the complex deterioration of RC bridge decks under fatigue loads and ASR & freeze/thawing cycles is investigated and the strong coupling is fairly predicted.

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  • コンクリート系床版に内在する凝縮水の動態による早期疲労限界状態

    Grant number:23246083  2011

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    前川 宏一, 内村 太郎, 長井 宏平, 長山 智則, 千々和 伸浩

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    Grant amount:\25350000 ( Direct Cost: \19500000 、 Indirect Cost:\5850000 )

    水が浸透したコンクリート系橋梁床板の早期疲労劣化問題を解明するため、コンクリート構造物のひび割れや接合界面などに介在する凝結水の動態と、コンクリート構造の変形応答・破壊進展に現れる速度依存性に着目し、地盤分野で多くの成果を挙げているBiotの固液二相理論を既往のコンクリートの非線形有限要素解析プログラムに組み込んだプロトタイプモデルを作成した。これにより、多方向分散ひび割れ構成則と対数時間積分法に基づく全履歴追跡型の疲労解析法と水の動態を、ひとつの数値計算システムで解くことが可能となった。作成した数値解析モデルの感度解析を実施するとともに、検証実験の詳細設計を行った。意図的にひび割れを生じさせた鉄筋コンクリート試験体で、載荷速度をパラメータとし、ひび割れ内部の水圧変動、試験体の変形(変位)、鉄筋のひずみおよび荷重の動的測定を行い、凝縮水の圧力変動と構造物の応答変化に関するデータを得ようとするものである。また、ひび割れを有するコンクリートとひび割れ内に貯留される凝縮水に着目し、既往の研究(ひび割れを有するコンクリートの透水係数同定実験)のデータに基づき、本研究で提案する数値モデルによる異方性透水係数の検証方法を策定した。
    本研究は3年間の研究期間を想定していたが、期間途中で申請者の基盤研究Sが採用されたため、重複制限により研究廃止措置となった。よって、平成23年5月末日までの2カ月に行った研究について報告するものである。

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  • Enhancement of multi-scale integrated analysis for real concrete structure

    Grant number:22760327  2010 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    CHIJIWA Nobuhiro

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    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    In order to simulate real concrete structures in full scale by the multi-scale integrated analysis, the analytical platform is enhanced. The excessive deflection of PC viaducts are reproduced successfully by this analytical platform. The analytical results show that the difference of time-dependent volumetric change caused by steel confinement and thermo-dynamical state between upper and bottom flange is the key of excessive deflection. Based on this fact, new design concept that giving different concrete property between upper and bottom flange to control the time dependent deflection is proposed, and its validity is confirmed. The change of structural performance with corrosion is also simulated by the system. The result shows that the degradation of structural performance with time is faster than expected because of the failure mode shift with deterioration.

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  • 遺伝子組み換え微生物を用いた,コンクリート構造物の生化学的解体法の開発

    Grant number:22656099  2010

    日本学術振興会  科学研究費助成事業  挑戦的萌芽研究

    石田 哲也, 千々和 伸浩, 渡邊 学

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    Grant amount:\3530000 ( Direct Cost: \3200000 、 Indirect Cost:\330000 )

    本研究は、限定的状況下において,セメント硬化体の分解に適した化学物質を無尽蔵に生み出す遺伝子組み換え微生物を作成し、「生化学的解体法」という新たなコンクリート解体法の構築を試みるものである。
    22年度は、セメント系材料の解体に適していると考えられる化学物質を産生するための連鎖化学反応機構の解明、反応に必要な遺伝子群の特定、特定された遺伝子群を有する生物の培養及び遺伝子抽出,得られた一部遺伝子のコンピテントセルへの組み込みを行った。
    セメント系材料の解体に適していると考えられる化学物質の前駆となる物質は、自然界では複数の生命体の共生関係の上で合成されているものである。生化学的解体法の実現には、まずこの前駆物質の合成において、共生関係を必要としない単一の生命体内で完了させる必要がある。そこで、この前駆物質の合成に必要な物質と環境条件を精緻に分析し、その条件を満たすために必要な遺伝子群を特定した。これらの遺伝子群をコンピテントセルに組み込むことよって、一つの生命体内において目的とする前駆物質を合成させることに成功した。
    前駆物質からさらに目的とする物質を合成するには酸化酵素を作用させる必要があり、また効率的に物質を産生させるために、合成した物質を組み換え微生物の体外に排出する機構を追加する必要がある。これらに必要な遺伝子の配列は既に特定済みであり、今後はこれらの遺伝子の組み込みを完了し、セメント系材料の解体性能試験へと進む予定である。

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