Updated on 2025/12/30

写真a

 
KOETAKA YUJI
 
Organization
Institute of Integrated Research Materials and Structures Laboratory Specially Appointed Professor
Title
Specially Appointed Professor
External link

Degree

  • 博士（工学） ( 京都大学 )

Research Interests

  • 鋼構造学・耐震工学

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Building structures and materials

Education

  • Osaka University

    - 1999

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    Country： Japan

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  • Osaka University   School of Engineering

    - 1997

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    Country： Japan

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Research History

  • Kyoto University   Professor

    2020.8

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  • Kyoto University   Associate Professor

    2011.4 - 2020.7

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  • Osaka Institute of Technology Faculty of Engineering, Department of Architecture   Associate Professor

    2010.4 - 2011.3

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  • Osaka Institute of Technology   Faculty of Engineering, Department of Architecture

    2007.4 - 2010.3

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  • Kyoto University   Graduate School of Engineering, Department of Architecture and Architectual Systems Engineering

    2001.9 - 2007.3

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  • 大成建設（株）技術研究所 研究員

    1999.4 - 2001.8

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Professional Memberships

Papers

  • Hierarchical Simulations and Seismic Performance Evaluation of Tall Buildings Equipped with Negative Stiffness Damped Outrigger with Damping Amplification

    Meng Wang, Xiang-He Liu, Chao Liu, Fei-Fei Sun, Yuji Koetaka, Satish Nagarajaiah, Xiu-Li Du

    Journal of Structural Engineering   2026.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1061/JSENDH.STENG-15224

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  • Hysteretic Behavior of Circular Hollow Section Panel Zones in Beam-to-Column Subassemblies with Large Panel Aspect Ratio

    Yosuke Ashida, Yuji Koetaka, Tatsuya Nakano, Iathong Chan, Dimitrios G. Lignos

    Journal of Structural Engineering   2025.9

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1061/JSENDH.STENG-14538

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  • 外径差のある角形鋼管どうしの隙間にモルタルを充填した柱継手の弾塑性挙動と降伏曲げ耐力 Reviewed

    藤平 剛久, 高塚 康平, 聲高 裕治

    鋼構造論文集   32 ( 126 )   15 - 30   2025.6

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：一般社団法人 日本鋼構造協会  

    DOI： 10.11273/jssc.32.15

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  • Dynamic Test of Negative Stiffness Damped Outrigger With Damping Amplification Reviewed

    M Wang, Y Koetaka, FF Sun, C Liu, S Nagarajaiah, Y Ashida, XL Du

    EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS   54 ( 4 )   1141 - 1155   2025.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/eqe.4302

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  • 箱形断面柱を用いた外ダイアフラム形式梁フランジ接合部の溶接部を考慮した降伏耐力評価式 Reviewed

    大庭 諒介, 森岡 宙光, 聲高 裕治, 中野 達也, 木下 智裕

    鋼構造論文集   31 ( 124 )   124_108 - 124_123   2025.1

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：一般社団法人 日本鋼構造協会  

    DOI： 10.11273/jssc.31.124_108

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  • 円形鋼管柱とH形断面梁から成る部分骨組中の柱梁接合部パネルの全塑性耐力に梁が及ぼす影響 Reviewed

    芦田 陽介, 聲高 裕治, 中野 達也

    日本建築学会構造系論文集   89 ( 823 )   1039 - 1050   2024.9

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本建築学会  

    DOI： 10.3130/aijs.89.1039

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  • Hybrid self-centering braces with NiTi-SMA U-shaped and frequency-dependent viscoelastic dampers for structural and nonstructural damage control Reviewed

    SL Hu, Y Koetaka, ZP Chen, SY Zhu, MS Alam

    ENGINEERING STRUCTURES   308   117920   2024.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.engstruct.2024.117920

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  • 高強度鋼箱形断面柱を用いた外ダイアフラム形式柱梁接合部の降伏耐力に及ぼす柱軸力の影響 Reviewed

    大庭 諒介, 森岡 宙光, 木下 智裕, 聲高 裕治

    日本建築学会構造系論文集   89 ( 820 )   627 - 638   2024.6

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本建築学会  

    DOI： 10.3130/aijs.89.627

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  • 横座屈を生ずる合成梁の上フランジ回転拘束に及ぼす梁幅方向の頭付きスタッド配置の影響 Reviewed

    上野 朋也, 聲高 裕治, 伊藤 冬樹, 内田 衞

    鋼構造論文集   31 ( 121 )   121_1 - 121_16   2024.3

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：一般社団法人 日本鋼構造協会  

    DOI： 10.11273/jssc.31.121_1

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  • 外径150mmの角形鋼管に適用するボルト式十字形柱継手の構造性能と設計 Reviewed

    聲高 裕治, 黒石 悠介, 來本 雅之, 立石 一, 桐山 伸一

    日本建築学会構造系論文集   89 ( 815 )   109 - 120   2024.1

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本建築学会  

    DOI： 10.3130/aijs.89.109

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  • Bidirectional Loading Test of Buckling-Restrained Braces with Gusset Plate Connections

    Yuji Koetaka, Yuki Tamura, Ryota Tobari, Tomohiro Kinoshita

    2024

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  • Proposal of Design Lateral Load for Column Joint of Steel Moment Frame

    Iathong Chan, Yuji Koetaka

    PROCEEDINGS OF THE 11TH INTERNATIONAL CONFERENCE ON BEHAVIOUR OF STEEL STRUCTURES IN SEISMIC AREAS, STESSA 2024 - VOL 1   519   699 - 709   2024

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

    DOI： 10.1007/978-3-031-62884-9_61

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  • 水平2方向の大変形を受ける座屈拘束ブレースの構面外座屈防止設計法に関する実験的検証 Reviewed

    田村 祐毅, 聲高 裕治, 戸張 涼太, 木下 智裕

    日本建築学会構造系論文集   88 ( 812 )   1475 - 1486   2023.10

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本建築学会  

    DOI： 10.3130/aijs.88.1475

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  • Frequency independent damped outrigger systems for multi-mode seismic control of supper tall buildings with frequency independent negative stiffness enhancement Reviewed

    M Wang, FF Sun, Y Koetaka, L Chen, S Nagarajaiah, XL Du

    EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS   52 ( 9 )   2731 - 2754   2023.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/eqe.3891

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  • 外ダイアフラム形式柱梁接合部を有する鋼構造骨組の層剛性を確保するための設計手順の提案 Reviewed

    藤根 和弘, 聲高 裕治, 森岡 宙光, 木下 智裕

    鋼構造論文集   29 ( 116 )   116_13 - 116_28   2022.12

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：一般社団法人 日本鋼構造協会  

    DOI： 10.11273/jssc.29.116_13

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  • Seismic application of steel rocking column bases with replaceable cover plates in steel MRFs Reviewed

    YW Li, Y Koetaka

    JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH   197   107451   2022.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.jcsr.2022.107451

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  • Steel rocking column bases with replaceable cover plates: Cyclic loading behaviour and practical design Reviewed

    Yan-Wen Li, Yuji Koetaka

    ENGINEERING STRUCTURES   264   ARTN 114467   2022.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.engstruct.2022.114467

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  • 桑村仁氏の討論に対する回答 Reviewed

    芦田 陽介, 聲高 裕治, 陳 逸鴻

    日本建築学会構造系論文集   87 ( 795 )   512 - 513   2022.5

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本建築学会  

    DOI： 10.3130/aijs.87.512

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  • Required Strength of Column Joint of Bidirectional Steel Moment-Resisting Frames

    Iathong Chan, Yuji Koetaka

    PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON BEHAVIOUR OF STEEL STRUCTURES IN SEISMIC AREAS, STESSA 2022   262   276 - 284   2022

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

    DOI： 10.1007/978-3-031-03811-2_26

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  • Full Plastic Strength of Circular Hollow Section Panel Zone with Large Aspect Ratio

    Yosuke Ashida, Yuji Koetaka, Iathong Chan

    PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON BEHAVIOUR OF STEEL STRUCTURES IN SEISMIC AREAS, STESSA 2022   262   343 - 350   2022

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

    DOI： 10.1007/978-3-031-03811-2_34

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  • Numerical model for 3D steel moment frames with H-shaped beams and hollow-section columns under multi-directional seismic ground motions

    Iathong Chan, Yuji Koetaka

    Engineering Structures   246   112730 - 112730   2021.11

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.engstruct.2021.112730

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  • EFFECT OF ASPECT RATIO ON ELASTO-PLASTIC BEHAVIOR OF PANEL ZONE WITH CIRCULAR HOLLOW SECTION

    ASHIDA Yosuke, KOETAKA Yuji, CHAN Iathong

    Journal of Structural and Construction Engineering (Transactions of AIJ)   86 ( 787 )   1357 - 1368   2021.9

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    1. Introduction

    It is well known that panel zones at beam-column joints of steel moment-resisting frames may yield under strong ground motion as well as beams and columns. It has been mentioned that the effect of shear force is dominant in the elasto-plastic behavior of panel zones, but as the panel aspect ratio, that is ratio between height and diameter of panel, increases, the effect of bending moment cannot be ignored. The main objective of this paper is to clarify the effect of aspect ratio on elasto-plastic behavior, e.g, elastic stiffness, full plastic strength and plastic deformation capacity, of panel zones with circular hollow sections.

     

    2. Cyclic loading test of single panel specimen

    To reveal elasto-plastic behavior of circular hollow section panel zones, cyclic loading test of single panel zones with a large aspect ratio were conducted. The ultimate state of the panel zones was either shear buckling, local buckling due to bending moment, or ductile crack at the surface of panel flange. The elastic stiffnesses of single panel zones agree well with the results by Eq. (3), which considers both shear deformations and flexural deformations.

     

    3. Finite element analysis for reproducing test results

    To examine in detail the test results in Chapter 2 and validate the finite element analysis (FEA) described in Chapter 4, reproduction FEA was performed. The analysis results correspond well with the test results and the validity of the FEA model is confirmed. The analysis results show that the presence of the backing bar affects initiation of ductile crack at the surface of panel flange observed during the cyclic loading test.

     

    4. Parametric study by finite element analysis

    FEA was conducted on a wider range of parameters than experiments to confirm the influence of parameters, including aspect ratio, on the full plastic strength and plastic deformation capacity due to buckling of single circular cross-section panel zones. The analysis results show that the effect of the diameter-to-thickness ratio on the full plastic strength is quite small, while the full plastic strength decreases as the aspect ratio rises. Moreover, it is found that the yielding part of the entire panel zone varies with the aspect ratio and axial force ratio when the panel reaches the full plastic strength. In addition, the analysis results show that in the case those panel zones reaches the ultimate state by local buckling due to bending moment, the plastic deformation capacity tends to decrease as the aspect ratio rises, while in the case of shear buckling, the plastic deformation capacity is minimized around the aspect ratio of 1.4.

     

    5. Investigation of calculating method of the full-plastic strength of circular hollow section panel zones

    The validity of the previous calculation method2), 9), 10) of full-plastic strength of circular hollow section panel zones with large aspect ratio was examined based on the results of FEA. The calculation results in Ref.9) agreed well with FEA results as shown in Fig.17.

     

    6. Conclusions

    This paper investigates the effect of aspect ratio on elastic stiffness, full plastic strength and plastic deformation capacity of panel zones with circular hollow sections. As a result, it is confirmed that the influence of the aspect ratio appears for all of the above properties.

    DOI： 10.3130/aijs.86.1357

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  • 横座屈の生ずる合成梁における頭付きスタッドの作用応力の予測に関する基礎的研究 Reviewed

    小野 南帆, 聲高 裕治

    鋼構造論文集   28 ( 111 )   111_91 - 111_105   2021.9

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：社団法人 日本鋼構造協会  

    DOI： 10.11273/jssc.28.111_91

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  • Steel frame with aseismic floor: From the viscoelastic decoupler model to the elastic structural response Reviewed

    Yang Xiang, Yuji Koetaka, Kohei Nishira

    EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS   50 ( 6 )   1651 - 1670   2021.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/eqe.3419

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  • 偏心を有する1層弾性骨組における剛床仮定の成立しない水平構面の最大面内応答予測 Reviewed

    武田 典佳, 聲高 裕治

    鋼構造論文集   27 ( 107 )   107_97 - 107_107   2020.9

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：社団法人 日本鋼構造協会  

    DOI： 10.11273/jssc.27.107_97

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  • 偏心を有する1層弾性骨組における剛床仮定の成立しない水平構面の最大面内応答予測 Reviewed

    武田 典佳, 聲高 裕治

    鋼構造論文集   27 ( 107 )   97 - 107   2020.9

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本鋼構造協会  

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  • 高強度鋼箱形断面柱を用いた外ダイアフラム形式柱梁接合部の力学的挙動に及ぼす梁偏心の影響 Reviewed

    藤根 和弘, 聲高 裕治, 森岡 宙光, 木下 智裕, 大庭 諒介

    日本建築学会構造系論文集   85 ( 772 )   833 - 843   2020.6

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本建築学会  

    DOI： 10.3130/aijs.85.833

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  • Elasto-plastic behavior of weak-panel beam-column joints with RC slabs under bidirectional loading

    Yandong Wang, Yuji Koetaka, Iathong Chan, Tatsuya Nakano

    JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH   168   ARTN 105880   2020.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.jcsr.2019.105880

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  • EVALUATION ON ELASTIC STIFFNESS AND YIELD STRENGTH OF HIGH STRENGTH STEEL BOX-SECTION COLUMN-TO-BEAM FLANGE CONNECTION WITH EXTERIOR DIAPHRAGM UNDER BI-DIRECTIONAL LOADING Reviewed

    Hiromitsu MORIOKA, Tomohiro KINOSHITA, Ryosuke OBA, Tatsuya NAKANO, Yuji KOETAKA

    Journal of Structural and Construction Engineering (Transactions of AIJ)   85 ( 770 )   607 - 617   2020.4

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Architectural Institute of Japan  

    DOI： 10.3130/aijs.85.607

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  • 高力ボルト接合による外ダイアフラム形式柱梁接合部における角形鋼管の局部変形挙動 Reviewed

    佐藤 由悟, 浅沼 愛実, 聲高 裕治, 岡田 忠義, 松尾 真太朗

    鋼構造論文集   27 ( 105 )   13 - 28   2020.3

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本鋼構造協会  

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  • 高強度鋼箱形断面柱を用いた外ダイアフラム形式柱梁接合部を有する十字骨組の繰返し載荷実験 Reviewed

    大庭 諒介, 森岡 宙光, 木下 智裕, 聲高 裕治, 吹田啓一郎, 村上 行夫

    日本建築学会構造系論文集   85 ( 767 )   129 - 139   2020.1

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本建築学会  

    DOI： 10.3130/aijs.85.129

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  • 高力ボルト接合による外ダイアフラム形式柱梁接合部における角形鋼管の局部変形挙動

    佐藤 由悟, 浅沼 愛実, 聲高 裕治, 岡田 忠義, 松尾 真太朗

    鋼構造論文集   27 ( 105 )   105_13 - 105_28   2020

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本鋼構造協会  

    DOI： 10.11273/jssc.27.105_13

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  • PLASTIC DEFORMATION DEMAND OF MULTI-STORY BRACED STEEL FRAMES Reviewed

    Daiki SHIMIZU, Yuji KOETAKA, Seiji MUKAIDE

    Journal of Structural and Construction Engineering (Transactions of AIJ)   85 ( 775 )   1221 - 1231   2020

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Architectural Institute of Japan  

    DOI： 10.3130/aijs.85.1221

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  • NUMERICAL MODEL FOR DETERIORATION BEHAVIOR CAUSED BY LOCAL BUCKLING OF COLD PRESS-FORMED SQUARE HOLLOW SECTION COLUMNS Reviewed

    谷口耕一, 聲高裕治, CHAN Iathong, 田中昂平

    日本建築学会構造系論文集   84 ( 766 )   1577 - 1587   2019.12

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

    DOI： 10.3130/aijs.84.1577

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  • Structural feasibility of incorporating the LVEM-isolated floor in the first story of a two-story steel frame Reviewed

    Yang Xiang, Yuji Koetaka

    ENGINEERING STRUCTURES   199   UNSP 109686   2019.11

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.engstruct.2019.109686

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  • Single-story steel structure with LVEM-isolated floor: Elastic seismic performance and design response spectrum Reviewed

    Yang Xiang, Yuji Koetaka, Naoki Okuda

    ENGINEERING STRUCTURES   196   UNSP 109314   2019.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.engstruct.2019.109314

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  • Cyclic behavior of beam-column joints with various yielding modes Reviewed

    Yandong Wang, Yuji Koetaka, Iathong Chan, Tatsuya Nakano

    JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH   159   245 - 259   2019.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCI LTD  

    DOI： 10.1016/j.jcsr.2019.04.020

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  • Ductility demand of bilinear hysteretic systems with large post-yield stiffness: Spectral model and application in the seismic design of dual-systems Reviewed

    Yang Xiang, Yuji Koetaka

    ENGINEERING STRUCTURES   187   504 - 517   2019.5

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCI LTD  

    DOI： 10.1016/j.engstruct.2019.02.011

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  • 鋼構造柱梁接合部パネルの全塑性耐力算定法の検証と実験データベース

    陳 逸鴻, 聲高 裕治

    構造工学論文集．Ｂ   ( 65 )   451 - 464   2019.3

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本建築学会  

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  • FULL PLASTIC STRENGTH OF SQUARE HOLLOW SECTION PANEL ZONE UNDER ARBITRARY DIRECTIONAL SHEAR FORCE Reviewed

    ARAKIDA Ryota, CHAN Iathong, KOETAKA Yuji

    Journal of Structural and Construction Engineering (Transactions of AIJ)   84 ( 755 )   85 - 95   2019.1

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Architectural Institute of Japan  

    In Japan, steel moment frames, which consist of H-shaped beams and square hollow section columns with through diaphragms, are often used for building structures. It is commonly known that panel zones of these steel moment frames often yield under strong ground motion and have high deformation capacity. In order to take into account high deformation capacity of panel zone for seismic design, it is needed to calculate the full plastic strength of panel zone. Several methods for calculating the full plastic strength of panel zone have been proposed by previous researches [Ref. 5]-7]]. For example, in the most frequently used method, which is adopted in the recommendation [Ref. 3]], only axial force and shear force is considered, and the effect of bending moments which act upon the top and bottom of panel zone is ignored. Thus, this method can only be applied to the panel with aspect ratio up to 1.6 [Ref. 3]]. On the other hand, most methods proposed by previous researches can not correspond to arbitrary directional shear force. Therefore, this paper proposes a new method to calculate the full plastic strength of square hollow section panel zones with through diaphragms under axial force, bi-directional shear forces and bi-axial bending moments.<br> Firstly, cyclic loading test was conducted in order to investigate effects of aspect ratio, axial force and input direction of shear force on elasto-plastic behavior of square hollow section panel zones, as described in Chapter 2. From the test results, it is clarified that ultimate states are classified as ductile crack, shear buckling, and local buckling. And the deformation capacity with shear buckling is larger than the cases with other ultimate states. Furthermore, it is verified that maximum strengths of panel with small aspect ratio and small axial force ratio under 45 degrees input are larger than those in other cases.<br> Secondly, finite element analysis (FEA) was conducted in order to verify full plastic strengths with various parameters more than the cyclic loading test. The validity of FEA model is confirmed by comparing between FEA results and loading test results, as discussed in Chapter 3. Strength interaction curves of bi-directional shear force, which are obtained by FEA, are shown in Fig. 12-14. From these figures, while the aspect ratio and axial force ratio are small, the strength interaction curve looks like square with a bit round at corner because shear yielding mainly occurs at all over the panel. On the other hand, while either aspect ratio or axial force ratio is large, the strength interaction curve is circlelike due to yielding under shear stress and normal stress at ends of panel.<br> Finally, a method to estimate the full plastic strength of square hollow section panel with through diaphragms, considered with correlation among axial force, arbitrary bi-directional shear force and bi-axial bending moment, is proposed. The full plastic strength is obtained as the smallest one between strength at center section and strength at end section. In Fig. 19 and 20, calculation results by the proposed method are compared to analysis results from Chapter 4. From these figures, in case aspect ratio is over 2.5 and input direction of 0 degrees without axial force, calculation results by proposed method underestimates full plastic strength of panel as much as 20%. However, aspect ratio of panel zones, which is used in steel moment frames, are usually under 2.0, in this case, calculation results by proposed method corresponds well to finite elements analysis results.

    DOI： 10.3130/aijs.84.85

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  • 局部座屈を伴うＨ形鋼梁の耐力劣化挙動に及ぼす骨組による拘束効果 Reviewed

    村上 竜人, 聲高 裕治

    日本建築学会構造系論文集   ( 752 )   1487 - 1497   2018.10

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  • ブレース付1層鋼構造骨組の必要塑性変形能力 Reviewed

    清水 大樹, 聲高 裕治, 向出 静司

    日本建築学会構造系論文集   83 ( 748 )   891 - 901   2018.6

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    DOI： 10.3130/aijs.83.891

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  • 軸方向変形を拘束されたH形鋼梁の局部座屈と破断による耐力劣化挙動 Reviewed

    村上 竜人, 聲高 裕治

    日本建築学会構造系論文集   83 ( 748 )   913 - 921   2018.6

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本建築学会  

    DOI： 10.3130/aijs.83.913

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  • Cyclic behavior of panel zone in beam-column subassemblies subjected to bidirectional loading Reviewed

    Yandong Wang, Ryota Arakida, Iathong Chan, Yuji Koetaka, Tatsuya Nakano

    Journal of Constructional Steel Research   143   32 - 45   2018.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier Ltd  

    DOI： 10.1016/j.jcsr.2017.12.017

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  • Collapse behavior of 18-story steel moment frame on shaking table test under long period ground motion Reviewed

    Jun Kubota, Motomi Takahashi, Yoshitaka Suzuki, Yoshikazu Sawamoto, Yuji Koetaka, Jun Iyama, Takuya Nagae

    Journal of Structural and Construction Engineering   83 ( 746 )   625 - 633   2018.4

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    DOI： 10.3130/aijs.83.625

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  • Analytical model for joint panels with square steel tubes under bi-directional shear forces and bending moments Reviewed

    Iathong Chan, Yuji Koetaka

    Journal of Structural and Construction Engineering   83 ( 745 )   503 - 513   2018.3

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    DOI： 10.3130/aijs.83.503

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  • RESTRAINT EFFECT OF CONCRETE FLOOR SLAB ON LATERAL-TORSIONAL BUCKLING BEHAVIOR OF H-SHAPED STEEL BEAM Reviewed

    KOETAKA Yuji, IGA Haruna, IYAMA Jun, HASEGAWA Takashi

    Kou kouzou rombunshuu   25 ( 97 )   47 - 59   2018.3

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Steel Construction  

    For examining lateral-torsional buckling behavior of H-shaped steel beam with concrete floor slab，numerical model with springs，which are considered with restraint effect by slab，on the beam upper flange is often used. This paper describes the restraint effect by slab on the beam，e.g.，torsional stiffness，lateral stiffness，maximum strength，and so on. First，loading test with slab-beam subassemblies was conducted to confirm the effects of some kinds of parameters on the stiffness and strength at the connection between beam upper flange and concrete slab. Second，prediction results by past researches and test results are compared，and in a part，new methods are proposed to enhance accuracy of prediction results.

    DOI： 10.11273/jssc.25.97_47

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  • Compression and shear characteristics of laminated visco-elastic materials for seismic floor system Reviewed

    Yuji Koetaka, Yohei Sakamoto

    Journal of Structural and Construction Engineering   82 ( 734 )   533 - 542   2017.4

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    DOI： 10.3130/aijs.82.533

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  • 幅厚比の大きなＨ形断面柱のスチフナによる補剛効果確認実験 Reviewed

    聲高 裕治, 小竹 知哉, 長谷川 隆

    構造工学論文集．Ｂ   ( 63 )   505 - 514   2017.3

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  • Effects of horizontal load bearing capacity on required column overdesign factor of 3d steel moment frames with square tube columns Reviewed

    Iathong Chan, Yuji Koetaka, Keiichiro Suita

    Journal of Structural and Construction Engineering   81 ( 730 )   2113 - 2121   2016.12

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    DOI： 10.3130/aijs.81.2113

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  • Evaluation of elastic stiffness and yield strength of high strength steel box-shaped column to beam flange joint in an exterior diaphragm moment connection Reviewed

    Ryosuke Oba, Tomohiro Kinoshita, Keiichiro Suita, Yuji Koetaka, Shintaro Matsuo, Yukio Murakami

    Journal of Structural and Construction Engineering   81 ( 730 )   2123 - 2132   2016.12

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    DOI： 10.3130/aijs.81.2123

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  • Method for buckling prevention of pin-ended tube-in- Tube braces - Evaluation of Local Deformation at End of Buckling Restraining Member Reviewed

    Yosuke Kaneshiro, Tomohiro Kinoshita, Yuji Koetaka, Keiichiro Suita, Kazuaki Miyagawa

    Journal of Structural and Construction Engineering   81 ( 725 )   1133 - 1141   2016.7

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Architectural Institute of Japan  

    DOI： 10.3130/aijs.81.1133

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  • Shaking table tests of steel frame with superelastic Cu-Al-Mn SMA tension braces Reviewed

    Yoshikazu Araki, Kshitij C. Shrestha, Nao Maekawa, Yuji Koetaka, Toshihiro Omori, Ryosuke Kainuma

    Earthquake Engineering and Structural Dynamics   45 ( 2 )   297 - 314   2016.2

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/eqe.2659

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  • 横座屈によって終局状態を迎えるＨ形断面梁の実験データに基づく最大耐力と塑性変形能力の評価 Reviewed

    伊賀はるな, 聲高裕治, 金尾伊織

    構造工学論文集   61B   185 - 198   2015.3

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  • Effects of input direction of ground motion and column overdesign factor on seismic response of 3D steel moment frames with square tube columns Reviewed

    Iathong Chan, Yuji Koetaka, Keiichiro Suita

    Journal of Structural and Construction Engineering   80 ( 717 )   1773 - 1783   2015

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    DOI： 10.3130/aijs.80.1773

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  • Plastic deformation capacity of cold press-formed SHS columns determined by local buckling and fracture Reviewed

    Ryohei Kuwada, Yuji Koetaka, Keiichiro Suita

    Journal of Structural and Construction Engineering   80 ( 718 )   1961 - 1970   2015

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    DOI： 10.3130/aijs.80.1961

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  • Feasibility of tension braces using Cu-Al-Mn superelastic alloy bars Reviewed

    Yoshikazu Araki, Nao Maekawa, Kshitij C. Shrestha, Makoto Yamakawa, Yuji Koetaka, Toshihiro Omori, Ryosuke Kainuma

    Structural Control and Health Monitoring   21 ( 10 )   1304 - 1315   2014.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：John Wiley & Sons, Inc.  

    DOI： 10.1002/stc.1644

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  • Elastic response of single-story steel structure with seismic floor system Reviewed

    Yuji Koetaka, Yasushi Yano, Keita Matsumoto

    Journal of Structural and Construction Engineering   79 ( 703 )   1259 - 1269   2014.9

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    DOI： 10.3130/aijs.79.1259

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  • １層弾性骨組における水平構面の面内応答予測法 Reviewed

    平野 倫子, 聲高 裕治, 吹田 啓一郎

    日本建築学会構造系論文集   79 ( 702 )   1127 - 1135   2014.7

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  • Development of turnbuckle brace with cu-al-mn superelastic alloy to reduce residual deformation Reviewed

    Yuji Koetaka, Yoshikazu Araki, Toshihiro Omori, Ryosuke Kainuma

    Journal of Structural and Construction Engineering   79 ( 695 )   163 - 172   2014.1

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    DOI： 10.3130/aijs.79.163

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  • Conditions to prevent global buckling of pin-ended tube-in-tube braces considering local deformation at end of buckling restraining member: Incaseofone-sided slidingtype Reviewed

    Tomohiro Kinoshita, Yosuke Kaneshiro, Yuji Koetaka, Keiichiro Suita, Kazuaki Miyagawa

    Journal of Structural and Construction Engineering   79 ( 706 )   1973 - 1982   2014

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    DOI： 10.3130/aijs.79.1973

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  • Reinforcement design of existing non-conformed steel buildings using STKR columns (Reinforcement wrapping mortar around column base) Reviewed

    KOETAKA Yuji, HASEGAWA Takashi

    Kou kouzou rombunshuu   20 ( 80 )   33 - 45   2013.12

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Steel Construction  

    In 2007, the building standard law of Japan was revised and a specification of column overdesign factor (COF) was added in case of square tube columns. These researches deal with existing non-conformed steel buildings using STKR columns according to being not satisfied with the specification of COF. In this paper, in order to enhance the full-plastic moment of column, reinforcement wrapping mortar around column base is proposed. An experimental verification of reinforced column was conducted to investigate mechanical behavior and confirm the validity of reinforcement design method. As a result, specifications for providing required bending moment to column were clarified.

    DOI： 10.11273/jssc.20.80_33

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  • Mechanical behavior of non-diaphragm type beam-to-column connection using thick square hollow section Reviewed

    SHIIBA Hiroaki, KOETAKA Yuji, SATO Yugo

    Kou kouzou rombunshuu   20 ( 80 )   57 - 72   2013.12

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Steel Construction  

    In case of non-diaphragm type beam-to-column connection, out-of-plane deformation of column flange occurs and has some effect on overall behavior of steel frame. This paper investigates mechanical behavior of non-diaphragm type beam-to-column connection using thick square hollow section by means of full-scale loading test and finite element method analysis. As a result, it is clarified that distribution of shear force at panel zone of non-diaphragm type is differnt from that of through-diaphragm type, and strength of the non-diaphragm panel decreases and elastic stiffness increases.

    DOI： 10.11273/jssc.20.80_57

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  • ロッキング方式PCaカーテンウォールの構面方向変位追従限界と限界後の挙動 Reviewed

    吹田 啓一郎, 平郡 竜志, 高 宏周, 聲高 裕治, 狗飼 正敏, 佐々木 哲也

    日本建築学会構造系論文集   78 ( 693 )   1841 - 1850   2013.11

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  • 魚骨形骨組を用いた地震応答解析による倒壊時の下層部変形集中現象 Reviewed

    若月雄大, 吹田啓一郎, 聲高裕治

    日本建築学会技術報告集   19 ( 43 )   945 - 950   2013.10

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  • 柱にSTKR材を用いた既存不適格鋼構造骨組の補強設計法（鋼板とPC鋼棒による補強） Reviewed

    聲高 裕治, 長谷川 隆

    鋼構造論文集   20 ( 79 )   123 - 133   2013.9

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本鋼構造協会  

    DOI： 10.11273/jssc.20.79_123

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  • Feasibility of Cu-Al-Mn superelastic alloy bars as reinforcement elements in concrete beams Reviewed

    Kshitij C. Shrestha, Yoshikazu Araki, Takuya Nagae, Yuji Koetaka, Yusuke Suzuki, Toshihiro Omori, Yuji Sutou, Ryosuke Kainuma, Kiyohito Ishida

    Smart Materials and Structures   22 ( 2 )   025025   2013.2

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP PUBLISHING LTD  

    DOI： 10.1088/0964-1726/22/2/025025

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  • 柱にSTKR材を用いた既存鋼構造骨組の柱梁耐力比の実状と既往の補強方法に関する調査 Reviewed

    長谷川 隆, 園田 正雄, 中野 達也, 聲高 裕治

    鋼構造論文集   19 ( 76 )   71 - 86   2012.12

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  • Mechanical performance and seismic response of knee brace damper structure of H-SA700 high strength steel members made by undermatched welds Reviewed

    Naoki Shinsai, Keiichiro Suita, Yuji Koetaka

    Journal of Structural and Construction Engineering   77 ( 682 )   1959 - 1968   2012.12

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    DOI： 10.3130/aijs.77.1959

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  • 鋼構造骨組の地震応答に及ぼす地震動の入力方向と部材の復元力特性の影響 Reviewed

    聲高 裕治, 金田 学

    鋼構造論文集   18 ( 69 )   17 - 32   2011.3

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  • Potential of superelastic Cu-Al-Mn alloy bars for seismic applications Reviewed

    Y. Araki, T. Endo, T. Omori, Y. Sutou, Y. Koetaka, R. Kainuma, K. Ishida

    EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS   40 ( 1 )   107 - 115   2011.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/eqe.1029

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  • 鋼構造柱梁接合部の塑性変形能力比較のための実験的研究，－通しダイアフラム形式と高力ボルト接合形式の比較－ Reviewed

    山崎 雅弘, 聲高 裕治, 松尾 真太朗

    鋼構造論文集   17 ( 68 )   101 - 112   2010.12

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  • Maximum in-plane shear force acting on floor slab of single-story steel structure Reviewed

    Journal of structural and construction engineering   75 ( 653 )   1377 - 1384   2010.7

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    CiNii Books

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  • Design criteria of buckling-restrained brace to prevent out-of-plane buckling Reviewed

    Journal of structural and construction engineering   74 ( 641 )   1371 - 1378   2009.7

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  • 細長比の大きい座屈拘束ブレースの性能確認実験とその設計法 Reviewed

    尾立 圭巳, 聲高 裕治, 井上 一朗, 金治 英貞

    鋼構造論文集   16 ( 61 )   1 - 10   2009.3

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  • OUT-OF-PLANE STIFFNESS AND YIELD STRENGTH OF CRUCIFORM CONNECTION FOR BUCKLING-RESTRAINED BRACE Reviewed

    KINOSHITA Tomohiro, KOETAKA Yuji, INOUE Kazuo, IITANI Kunihiro

    Journal of structural and construction engineering   73 ( 632 )   1865 - 1873   2008.10

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Architectural Institute of Japan  

    In order to prevent out-of-plane buckling of buckling-restrained brace, its connections must have enough out-of-plane stiffness and be kept elastic. This paper deals with out-of-plane stiffness and yield strength of buckling-restrained brace's connection whose section is cruciform. Firstly, methods of calculating both out-of-plane stiffness and yield strength of connection are proposed by means of RBSM. And secondly, experimental verifications to load connection specimens were conducted. As a result, it is clarified that out-of-plane stiffness is very small if finstiffener is not connected to beam-flange. Therefore, it is recommended that fin-stiffener should be welded to beam-flange to satisfy required out-of-plane stiffness and yield strength.

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    Other Link： http://www.aij.or.jp/paper/detail.html?productId=183668

  • 建築用ダンパー材料としてのCu-Al-Mn超弾性合金の機械的性質 Reviewed

    荒木 慶一, 木村 寛之, 聲高 裕治, 大森 俊洋, 須藤 祐司

    銅と銅合金   47 ( 1 )   73 - 77   2008.8

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  • 接合部を含む座屈拘束ブレースの構面外座屈防止条件， Reviewed

    木下 智裕, 聲高 裕治, 井上 一朗, 飯谷 邦祐

    日本建築学会構造系論文集   ( 621 )   141 - 148   2007.11

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  • FULL-SCALE TEST OF WELD-FREE STEEL STRUCTURE WITH KNEE BRACE DAMPERS Reviewed

    KOETAKA Yuji, ANDO Masakazu, BYAKUNO Yasuki, SUITA Keiichiro, INOUE Kazuo

    Journal of Structural and Construction Engineering (Transactions of AIJ)   70 ( 595 )   109 - 116   2005.9

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    This paper presents the results of an experimental verification on a full-scale three story 'weld-free' structure, which is proposed as an innovative steel frame adopting mechanical joints equipped with buckling-restrained type knee brace dampers for wide-flange moment frames. Major findings are as follows: (1) The weld-free structure exhibits stable hysteresis behavior under 0.04 radian drift angle in-plane, (2) The yield mechanism by plastification of dampers and column bases meet the target mechanism, (3) The structure collapses by overall buckling of dampers and lateral-torsional buckling of beams but the maximum drift angle attained 0.10 radian preserving sufficient lateral resistance.

    DOI： 10.3130/aijs.70.109_2

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    Other Link： http://www.aij.or.jp/paper/detail.html?productId=182311

  • 塑性変形能力確保のための柱梁接合部設計法に関する日米比較 Reviewed

    聲高 裕治, 日高桃子, 吹田 啓一郎

    鋼構造論文集   12 ( 45 )   41 - 56   2005.3

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  • 方杖ダンパーの座屈拘束設計と性能確認実験 Reviewed

    百野 泰樹, 聲高 裕治, 井上 一朗, 諸岡 繁洋

    鋼構造論文集   12 ( 45 )   233 - 241   2005.3

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  • 偏心を有する鋼構造強柱立体骨組の等価 1 質点 3 自由度系への置換（弾塑性応答に関する諸量） Reviewed

    聲高 裕治, 岩崎 晃久

    鋼構造論文集   12 ( 45 )   217 - 232   2005.3

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  • 柱脚の地震被害，設計法，設計実務に関する日米比較 Reviewed

    日高桃子, 聲高 裕治, 吹田 啓一郎

    鋼構造論文集   12 ( 45 )   57 - 69   2005.3

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  • Mechanical property of beam-to-column moment connection with hysteretic dampers for column weak axis Reviewed

    Y Koetaka, P Chusilp, ZJ Zhang, M Ando, K Suita, K Inoue, N Uno

    ENGINEERING STRUCTURES   27 ( 1 )   109 - 117   2005.1

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    DOI： 10.1016/j.engstruct.2004.09.002

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  • 方杖ダンパーを用いた柱梁高力ボルト接合骨組の地震応答解析 Reviewed

    百野 泰樹, 聲高 裕治, 井上 一朗

    日本建築学会構造系論文集   ( 586 )   219 - 226   2004.12

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  • 接合部を含む座屈拘束ブレースの構面外座屈荷重 Reviewed

    天畠 秀秋, 聲高 裕治, 井上 一朗

    日本建築学会構造系論文集   ( 581 )   127 - 134   2004.7

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  • 偏心を有する鋼構造強柱立体骨組の等価１質点３自由度系への置換（弾性応答に関する諸量） Reviewed

    聲高 裕治, 岩崎 晃久

    鋼構造論文集   11 ( 42 )   75 - 88   2004.6

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  • 方杖ダンパーを用いた柱梁高力ボルト接合骨組の設計と地震応答 Reviewed

    張 シシュン, 井上 一朗, 聲高 裕治, 百野 泰樹

    鋼構造論文集   11   63 - 74   2004.6

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  • 鋼構造強柱偏心立体骨組におけるエネルギー消費部材の必要塑性変形能力（１層１スパン耐力偏心骨組） Reviewed

    聲高 裕治, 井上 一朗

    日本建築学会構造系論文集   ( 524 )   125 - 132   1999.10

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Research Projects

  • Improvement of numerical analysis technique for three-dimensional behavior of steel structures under quite huge earthquakes

    Grant number：24K01027  2024.4 - 2027.3

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

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    Grant amount：\18590000 （ Direct Cost: \14300000 、 Indirect Cost：\4290000 ）

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  • Self-centering hybrid damper for improving life-cycle seismic resilience of building structures

    Grant number：23KF0046  2023.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

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    Grant amount：\1400000 （ Direct Cost: \1400000 ）

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  • Seismic performance of tall building with passive negative stiffness damped outrigger

    Grant number：23KF0043  2023.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

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    Grant amount：\2400000 （ Direct Cost: \2400000 ）

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  • 負剛性を有するアウトリガー型ダンパーを適用した高層建物の耐震性能

    Grant number：22F22364  2022.11 - 2025.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    聲高 裕治, WANG MENG

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    Grant amount：\2300000 （ Direct Cost: \2300000 ）

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  • Establishment of technology to maintain the functionality of interior spaces during earthquakes by elucidating the interaction between ceilings, walls, and equipment

    Grant number：22H00232  2022.4 - 2027.3

    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：\41210000 （ Direct Cost: \31700000 、 Indirect Cost：\9510000 ）

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  • 来るべき巨大地震に対する鋼構造柱梁接合部の亀裂発生予防法と破断寿命診断法の開発

    Grant number：23K22903  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)

    中野 達也, 山田 哲, 聲高 裕治

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    Grant amount：\17550000 （ Direct Cost: \13500000 、 Indirect Cost：\4050000 ）

    本研究では，鋼構造柱梁接合部（梁端接合部および柱端接合部）の亀裂発生感度と累積損傷・変形性能の関係を体系的な実験・解析により定量化することを目的としている．研究２年目の令和５年度は，繰返し履歴を考慮できる有限要素法解析プログラムとして「MSC MARC」を新たに導入し，パラメトリック解析を実施するための各種の整備を行った．また，梁端接合部に関する構造実験の試験体を製作した．
    梁端接合部については，前年度の検討から，エンドタブ形式（固形／スチール）が歪集中係数に及ぼす影響は，スカラップの有無と組み合わせた複合的な評価が必要であることが判明した．そもそもエンドタブ形式の影響を受ける梁端フランジ幅端部には溶接部が存在し，形状不連続だけでなく材料不連続も有する評価が難しい部位である．そこで問題を明快にするために，材料不連続のないスカラップ底からの破断に焦点をあて，断面寸法および載荷履歴などをパラメータとした事前解析を実施し，構造実験のパラメータを確定させた上で計６体の試験体を製作した．また，最新の亀裂発生評価指標であるロード角パラメータの算定に必要となる様々な形状の機械試験を計画し，パラメータ同定のための解析モデルを構築した．
    柱端接合部については，パラメトリック解析に先立って解析モデルの簡略化に取り組んだ．せん断曲げを受ける角形鋼管角部の材端部における応力・歪状態を，２Ｄソリッド要素の軸対称モデルで再現できることを示し，ポアソン効果による変形拘束を考慮した解析モデルの構築に成功した．年度末には，溶接止端部の寸法および材料特性分布（母材と溶接金属の強度比）に関するパラメトリック解析に着手しており，解析結果が出揃えば，延性亀裂発生条件に基づく塑性変形性能と各影響因子の関係を定量的に評価できる見込みが得られた．

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  • 来るべき巨大地震に対する鋼構造柱梁接合部の亀裂発生予防法と破断寿命診断法の開発

    Grant number：22H01633  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)

    中野 達也, 山田 哲, 聲高 裕治

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    Grant amount：\17550000 （ Direct Cost: \13500000 、 Indirect Cost：\4050000 ）

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  • Application of Metabolism Structure to be able to Upgrade Structural Performance under Service Continuity

    Grant number：21H04574  2021.4 - 2025.3

    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：\42120000 （ Direct Cost: \32400000 、 Indirect Cost：\9720000 ）

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  • Seismic performance and design methodology of EDRCs under bidirectional earthquakes

    Grant number：20F20344  2020.11 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

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    Grant amount：\2200000 （ Direct Cost: \2200000 ）

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  • Seismic performance and design methodology of steel structures with LVEM-isolated floor

    Grant number：18F18052  2018.7 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

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    Grant amount：\2300000 （ Direct Cost: \2300000 ）

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  • Proposal of design methodology to prevent collapse of steel moment-resisting frames with seismic devices with ensuring seismic performance of the devices under bidirectional quite huge earthquakes

    Grant number：18H01585  2018.4 - 2022.3

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

    KOETAKA Yuji

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    Grant amount：\17420000 （ Direct Cost: \13400000 、 Indirect Cost：\4020000 ）

    We focused on a buckling-restrained brace (RBR) that is a kind of seismic device and verified the ultimate behavior under quite huge ground motion worried about the occurrence in the recent decade by cyclic loading test using innovative bidirectional loading equipment. Further, effects of various triggers of strength deterioration of members, including the ultimate behavior of BRB, in steel moment-resisting frames with BRBs were clarified by time history analysis.

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  • Three dimensional elasto-plastic behavior and structural performance of steel subframe with floor slab

    Grant number：18H01580  2018.4 - 2021.3

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

    Nakano Tatsuya

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    Grant amount：\17680000 （ Direct Cost: \13600000 、 Indirect Cost：\4080000 ）

    In this study, the elasto-plastic behavior of three-dimensional column-beam specimens with a floor slab was investigated for the seismic performance evaluation of the steel moment frame consisted from square hollow section columns and wide flange beams. The center or corner column-beam specimens with a floor slab were investigated by the bi-directional loading test. From test results, the effects of the frame shape, the loading direction and the strength ratio between members were clarified experimentally. In addition, the effect of the floor slab was clarified by comparison with the past test results of specimens without a floor slab. Moreover, the stress transfer mechanism around column- beam connection was investigated by a finite element analysis. From analysis results, the deformation capacity by the fracture of the beam-end connection limited were clarified analytically.

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  • 高層鋼構造建物の倒壊挙動における構造骨組と外装材の損傷過程解明と予測技術の構築

    Grant number：26249080  2014.4 - 2018.3

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    吹田 啓一郎, 林 康裕, 聲高 裕治, 高塚 康平

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    Grant amount：\32240000 （ Direct Cost: \24800000 、 Indirect Cost：\7440000 ）

    １）高層建物の平面骨組低層部3層を取り出した形の魚骨形骨組試験体による大変形載荷実験のために，魚骨梁端部をリンク材で結合することにより梁端の境界条件を実現し，上層の自重を模した鉛直力を柱頂部に載荷し，地震力を模した水平力を頂部の柱梁交点に加力することが可能な載荷装置を開発した。試験体は，柱梁耐力比、部材幅厚比、柱軸力比をパラメータとし，崩壊形が異なる3種類の魚骨形骨組を選定し，これを対象に大変形載荷実験を行い，梁端破断，柱・梁・柱脚の局部座屈，パネル降伏の損傷を経て倒壊に至る挙動を把握した。また，同一条件の数値解析を実施し，崩壊型を決定づける部材耐力劣化の怪異時期や劣化の進行を実験と比較・分析した。
    ２）柱梁部材の大変形繰返し載荷実験。魚骨形骨組試験体の構造要素の履歴特性を把握するための繰返し載荷実験は，１）の魚骨形骨組実験において柱，梁，接合部パネル，柱脚の全ての構造要素の弾塑性履歴挙動を取得可能な計測機器を配備することにより，必要なデータを取得した。
    ３）ロッキング方式PCa帳壁付架構の変位追従限界後の挙動を検討するために実施された、構面方向パネル，構面外方向パネル，2方向が直交するコーナー部の3種類の配置の異なる載荷実験結果を分析し，変位追従時とその限界を越えた後のパネルによる層せん断力―層間変形角の関係式を導出した。その結果，パネル水平力が地震時に骨組耐力に及ぼす影響を検討するためのモデルを構築することに成功した。
    ４）角形鋼管柱の載荷実験で観察された局部座屈と破断による劣化域を含む履歴挙動を再現できるようにMS要素を用いた解析モデルの構築を行い，部材端部にMS要素を配置した立体骨組解析プログラムを作成し，バイリニア型の履歴特性で地震応答解析を行った。その結果，柱の損傷を抑制して梁降伏先行型の安定した履歴挙動を確保するのに必要な柱梁耐力比を提示した。

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  • Comprehensive verifications on structural performance, environmental performance and productivity of seismic floor system for practical realization

    Grant number：25289184  2013.4 - 2016.3

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

    KOETAKA YUJI, SUITA Keiichiro, KURATA Masahiro

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    Grant amount：\15340000 （ Direct Cost: \11800000 、 Indirect Cost：\3540000 ）

    Comprehensive verifications as following for practical realization of seismic floor, which has the advantages that seismic performance and productivity under dismantlement are superior to that of the conventional floor slab, were conducted; (1) Selection of polymeric material for seismic floor, (2) Formulation of prediction method of maximum responses of building structure with seismic floor, (3) Experimental verification of multi-story elasto-plastic structures with seismic floor, (4) Verification of in-plane stiffness and in-plane strength of floor, (5) Verification of vertical vibration characteristics of seismic floor, and (6) Verification of productivity of seismic floor.
    As a result, useful technical data and knowledges were obtained from these verifications. In particular, for the purpose of the design of seismic floor, the evaluation methods were proposed and points to notice were revealed about tasks from (1) to (4).

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  • Development of new floor system to enhance the seismic performance as well as dismantlement

    Grant number：22686051  2010 - 2012

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

    KOETAKA Yuji

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    Grant amount：\12090000 （ Direct Cost: \9300000 、 Indirect Cost：\2790000 ）

    We have developed a new floor system, which is built up by installing visco容lastic materials (VEMs) between floor slab and beam upper flange, to enhance seismic performance of a building structure. Numerical analysis and shaking table test were conducted in order to verify seismic response of single耀tory steel moment frame equipped with the proposed floor system. From these investigations, effects of various parameters on seismic response were revealed, for instance, story drift decreases and shear deformation of VEM increases when shape factor of VEM becomes smaller. As a result, it is clarified that the shape factor of VEM should be defined appropriately.

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  • Improvement of Plastic Deformation Capacity of Steel High-rise Buildings against Various Strong Ground Motions

    Grant number：21246087  2009 - 2012

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

    SUITA Keiichiro, TANAKA Tsuyoshi, NAKASHIMA Masayoshi, HAYASHI Yasuhiro, SATO Atsushi, KOETAKA Yuji

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

    In order to evaluate deformation capacity of moment connections until fracture for steel high-rise buildings subjected to long-period long-duration ground motion, a series of constant and varying amplitude cyclic loading tests were conducted. The effect of strength of connection, welding details and floor slab on deformation capacity were quantitatively indicated and the prediction method to estimate propagation of cracks was proposed to evaluate deformation capacity until fracture of connection. A method to strengthen moment connections by thick flange is proposed and its effectiveness is experimentally indicated

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  • Plastic deformation demand of moment frame with hysteresis damper in consideration of eccentricity

    Grant number：19760387  2007 - 2008

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

    KOETAKA Yuji

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    Grant amount：\2970000 （ Direct Cost: \2700000 、 Indirect Cost：\270000 ）

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  • Development of integrated techniques for seismic retrofit of existing steel buildings using energy dissipation devices

    Grant number：17206058  2005 - 2008

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

    INOUE Kazuo, TAKEWAKI Izuru, TSUJI Masaaki, ARAKI Yoshikazu, YAMAKAWA Makoto, KUWAHARA Susumu, KOETAKA Yuuji, MOROOKA Shigehiro

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    Grant amount：\49140000 （ Direct Cost: \37800000 、 Indirect Cost：\11340000 ）

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  • 既存鉄骨造建物における柱脚現有性能の実証に基づく耐震性能再評価

    Grant number：17656176  2005 - 2006

    日本学術振興会  科学研究費助成事業  萌芽研究

    吹田 啓一郎, 金尾 伊織, 聲高 裕治

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    Grant amount：\3300000 （ Direct Cost: \3300000 ）

    既往の研究や地震被害の特徴から,柱脚性能と鉄骨建物の間の関係に着目して既存建物の耐震性能を論じようとしたとき,柱脚の実態について明らかにすべき課題が多岐にわたり,さらに定量的な情報を与える設計・施工の現場の技術資料が不足しているなど,その解決が容易ではない課題であることが再認識される.本研究はこの課題に取り組む方法として,(1)既存建物から採取した柱脚の実性能を実験で検証し,(2)上部構造と総合して品質上の問題点を踏まえた実建物の耐震性能を明らかにする,という手順を考え,具体的な既存鉄骨建物にこれを適用してその手法の妥当性を検証したものである.
    具体的な検討対象は1969年建設の2階建鉄骨建物である.
    (1)既存鉄骨建物の柱脚性能検証:実在する建物の性能を,施工品質の影響も含めて実物の載荷実験により検証した.箱形断面柱にベースプレートを介してアンカーボルトにより露出形式により接合されている点は現在と共通するが,柱とベースプレートの溶接が片面隅肉溶接であり,耐力の不足をリブ・スチフナにより補う設計としている点が現在と異なる特徴である.アンカーボルトの降伏が先行した後,ベースプレートが降伏し,最大変形角0.1radまで露出柱脚固有の履歴特性を示した.その間,溶接形式の特徴は力学特性に影響を及ぼしていないが,最終破壊形式は隅肉溶接の破断によるもので,これが変形能力を限界付けている点が現在と異なる特徴である.
    (2)既存鉄骨建物の柱脚性能実験により明らかにされた柱脚の構造特性,履歴特性,塑性変形能力,破壊限界に関する情報を定量化し,その成果を既存鉄骨建物の数値解析モデルに適用することにより,鉄骨建物全体の地震時応答特性と耐震能力の評価を試みた.

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  • SEISMIC PERFORMANCE EVALUATION AND RETROFIT FOR STRUCTURAL CONNECTIONS OF EXISTING STEEL BUILDINGS

    Grant number：16360277  2004 - 2006

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

    SUITA Keiichiro, NAKASHIMA Masayoshi, MOROOKA Shigehiro, KANAO Iori, KOETAKA Yuji

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    Grant amount：\14900000 （ Direct Cost: \14900000 ）

    1.Seismic performance of an existing steel building constructed in 1969 was experimentally evaluated. The inspection was focused on strength and deformation capacity of moment connections and column base connections jointed by fillet welding. Based on hysteresis relations obtained from dynamic loading test, the seismic responses and performance of the overall building was analytically evaluated.
    2.Seismic performance of three existing steel buildings constructed in 1980s were experimentally evaluated. The research was focused on through diaphragm type moment connections composed of square tube columns and wide flange beams joined by complete joint penetration welding. Inspections on welding revealed characteristics of welding defects and the effect on deformation capacity of moment connections by dynamic loading tests.
    3.Full-scale dynamic tests on restrained brace type dampers subjected long-period ground motions were conducted to evaluate deformation capacity of hysteretic dampers. The test results revealed sufficient capacity of dampers to retrofit of existing tall buildings constructed in early period.
    4.Seismic performance of moment connections composed of large section members adopted for tall buildings was experimentally examined. Built-up Square tube columns fabricated by electro-slag welding and large depth beams (800mm and 1000mm) were used to reproduce the moment connections in 1970s. The deformation capacity of the beam-column subassemblies were experimentally investigated.

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  • 機械式接合システムを用いた鋼構造建築物の耐震性向上に関する研究

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    Grant type：Competitive

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  • 偏心を有する鋼構造立体骨組の必要塑性変形能力に関する研究

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    Grant type：Competitive

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  • 解体性を考慮した簡易免震床構造システムの開発

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    Grant type：Competitive

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  • 座屈拘束ブレースの構面外座屈の防止に関する研究

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    Grant type：Competitive

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