Updated on 2026/04/14

写真a

 
KONO SUSUMU
 
Organization
Institute of Integrated Research Multidisciplinary Resilience Research Center Professor
Title
Professor
Other name(s)
Sam
External link

Degree

  • Master of Engineering ( Kyoto University )

  • Doctor of Philosophy ( University of Illinois (USA) )

Research Interests

  • Structural engineering, Seismic engineering, Reinforced concrete structures

  • Performance based design

  • Reinforced Concrete Structures

  • 耐震工学

  • 鉄筋コンクリ-ト構造学

  • 土木及び建築構造学

  • Seismic design

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Structure engineering and earthquake engineering

Education

  • Univ. of Illinois   Graduate School, Division of Engineering   Civil Engineering

    - 1995

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    Country： United States

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  • イリノイ大学大学院   工学研究科   建設工学科

    - 1995

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    Country： United States

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  • Kyoto University   Faculty of Engineering

    - 1987

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  • Kyoto University   Faculty of Engineering   School of Architecture

    - 1987

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    Country： Japan

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Research History

  • Kyoto University   Graduate School of Engineering   Associate Professor

    2002 - 2007

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  • Kyoto University   Graduate School of Engineering   Assistant Professor

    1998 - 2002

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  • Toyohashi University of Technology   Assistant Professor

    1996 - 1998

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  • University of Illinois

    1991 - 1995

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  • University of Washington

    1989 - 1991

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

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Professional Memberships

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Papers

  • 座談会 AI等の先進技術をこれからどう生かせるか—特集 創立60周年記念特集号 ; 座談会

    田附 伸一, 中田 清史, 松原 由典, 安武 祐太, 河野 進, 渡邊 秀和

    コンクリート工学   63 ( 9 )   783 - 788   2025.9

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    Language：Japanese   Publisher：東京 : 日本コンクリート工学会  

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    Other Link： https://ndlsearch.ndl.go.jp/books/R000000004-I034352707

  • プレキャストコンクリート杭(3)プレキャストコンクリート杭の構造性能評価

    河野 進, 小林 勝已

    コンクリート工学   63 ( 8 )   624 - 629   2025.8

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    Language：Japanese   Publisher：東京 : 日本コンクリート工学会  

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    Other Link： https://ndlsearch.ndl.go.jp/books/R000000004-I034320077

  • Strain-based performance evaluation of planar flexural reinforced concrete walls Reviewed

    Priyana Rajbhandari, Trevor Zhiqing Yeow, David Mukai, Susumu Kono

    Engineering Structures   327   119643 - 119643   2025.3

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    Authorship：Last author   Language：English   Publisher：Elsevier BV  

    DOI： 10.1016/j.engstruct.2025.119643

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  • Quantitative crack evaluation in slender reinforced concrete walls with rectangular section Reviewed

    Priyana Rajbhandari, Chanipa Netrattana, Taku Obara, Kono Susumu

    Resilient Cities and Structures   3 ( 4 )   1 - 20   2024.12

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    Authorship：Last author   Language：English   Publisher：Elsevier BV  

    DOI： 10.1016/j.rcns.2024.07.001

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  • How healthy are Japanese piles and foundation members? Reviewed

    Kono S., Thusoo S., Jasinda C., Obara T., Subedi N., Mukai D.

    FIB Symposium   2024.11

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    Authorship：Lead author   Language：English  

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  • Evaluation method of shear capacity at slab-web interface in hybrid beam system Reviewed

    Singh R., Sato Y., Sasaki H., Kono S.

    Fib Symposium   2024.11

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  • Experimental study on the flexural behavior of steel-tubed reinforced ultra-high strength concrete columns Reviewed

    Hirata N., Kono S.

    FIB Symposium   2024.11

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  • Damage states and fragility curves for lightly reinforced concrete walls Reviewed

    Rajbhandari P., Obara T., Mukai D., Kono S.

    FIB Symposium   2024.11

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  • Experimental and Numerical Investigation on Uniaxial Compressive Performance of Hollow Circular High-strength Precast CFST Piles Reviewed

    Jasinda C., Kono S., Obara T., Mukai D., Yamaji M.

    FIB Symposium   2024.11

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  • Revision of shear force versus residual shear crack width relationships for damage control design of RC beams

    Onodera K., Hishikawa Y., Rajbhandari P., Yeow Y., Kono S., Nakano H.

    The 25th Taiwan-Korea-Japan Joint Seminar on Earthquake Engineering on Building Structures SEEBUS   289 - 297   2024.10

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  • Improved shear capacity estimation of steel encased concrete piles considering shear contribution of concrete

    Watanabe Y., Jasinda1 C., Kobayashi K., Kono S., Yeow T.

    The 25th Taiwan-Korea-Japan Joint Seminar on Earthquake Engineering on Building Structures SEEBUS   255 - 261   2024.10

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  • EVALUATION METHOD OF SHEAR CAPACITY OF RC REGION IN HYBRID BEAMS WHERE STEEL IS EMBEDDED IN RC REGION AT BEAM ENDS Reviewed

    Ravi SINGH, Yukihiro SATO, Hitoshi SASAKI, Susumu KONO

    Journal of Structural and Construction Engineering (Transactions of AIJ)   89 ( 821 )   798 - 806   2024.7

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    Authorship：Last author   Language：Japanese   Publisher：Architectural Institute of Japan  

    In recent years with the fabrication cost of steel soaring, there is a concerted effort to reduce the cost in order to construct large span buildings such as logistic terminals, shopping malls and medical facilities. Research investigations are being carried out and one of the methods is using a composite structure with reinforced concrete columns and hybrid beams. Since a greater shear force is transferred to the RC region, a precise method to estimate the shear capacity is necessary. Therefore, in this study hybrid beams under shear failure were examined and a method to the evaluate shear capacity is proposed.

    DOI： 10.3130/aijs.89.798

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  • FLEXURAL BEHAVIOR OF STEEL-TUBED REINFORCED ULTRA-HIGH STRENGTH CONCRETE COLUMNS UNDER CONSTANT AXIAL LOAD AND CYCLIC LATERAL LOAD Reviewed

    Nobuaki HIRATA, Susumu KONO

    Journal of Structural and Construction Engineering (Transactions of AIJ)   89 ( 821 )   751 - 762   2024.7

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    Authorship：Last author   Language：English   Publisher：Architectural Institute of Japan  

    Loading tests were conducted on three steel-tubed reinforced ultra-high-strength concrete columns to study the effect of the amount and strength of transverse reinforcement on their flexural behavior using these three specimens and four previously tested specimens by authors. Test results showed that the shear reinforcement had a significant influence on the ultimate deformation. A motion capture system was used to investigate the stress condition of the concrete. A fiber-based analysis was also carried out to find the proper stress-strain relation for concrete to simulate the moment-curvature relations.

    DOI： 10.3130/aijs.89.751

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  • 鋼管補強した超高強度鉄筋コンクリート造柱の曲げ挙動に関するFEM解析 Reviewed

    濱田夏帆, 黄学純, 平田延明, 河野進

    コンクリート工学年次論文報告集   46 ( 2 )   577 - 582   2024.7

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    Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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  • 高圧縮軸力下におけるSC杭の曲げ変形性能に関する研究 Reviewed

    江崎宏哉, 河野進, Jasinda C., 長尾圭人

    コンクリート工学年次論文報告集   46 ( 2 )   409 - 414   2024.7

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  • ボンドありPCaPC造壁部材の骨格曲線評価に関する実験的研究 Reviewed

    秋田悠揮, 小原拓, 河野進, 谷昌典

    コンクリート工学年次論文報告集   46 ( 2 )   457 - 462   2024.7

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  • アンボンドPCaPC造壁の骨格曲線評価のための解析的研究 Reviewed

    松沢隼斗, 秋田悠揮, 河野進, 谷昌典

    コンクリート工学年次論文報告集   46 ( 2 )   43 - 48   2024.7

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  • 1275MPa級のせん断補強筋を有するＲＣ梁部材の構造性能に関する実験的研究 Reviewed

    岡﨑奏大, 菱川善就, 河野進, 中野洋之

    コンクリート工学年次論文報告集   46 ( 2 )   331 - 336   2024.7

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  • 鋼管コンクリート杭のせん断耐力評価に関する実験的研究 Reviewed

    渡邊祐太, 河野進, 小林勝已, 山路麻未

    コンクリート工学年次論文報告集   46 ( 2 )   415 - 420   2024.7

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  • Interface Shear Capacity and Flexural Performance of Hybrid Beams Reviewed

    Singh R., Sato Y., Sasaki H., Mukai D., Kono S.

    ACI Structural Journal   121 ( 3 )   109 - 118   2024.5

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Concrete Institute  

    DOI： 10.14359/51740482

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  • アンボンドPC構造の損傷制御性能評価に向けて : 履歴復元力特性の高精度数値モデルの開発—特集 建築特集

    河野 進, 谷 昌典, 小原 拓

    プレストレストコンクリート = Journal of prestressed concrete, Japan   65 ( 4 )   16 - 21   2023

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    Language：Japanese   Publisher：東京 : プレストレストコンクリート工学会  

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    Other Link： https://ndlsearch.ndl.go.jp/books/R000000004-I033005211

  • NUMERICAL ANALYSIS OF PRECAST REINFORCED HIGH-STRENGTH CONCRETE PILES FOCUSING ON ULTIMATE CONDITION UNDER HIGH AXIAL COMPRESSION FORCE AND BENDING MOMENT

    OBARA Taku, NARUSE Shunsuke, KONO Susumu, KOBAYASHI Katsumi, ASAI Yoichi, KIYA Yoshinobu, GOAN Mitsumaru

    Journal of Structural and Construction Engineering (Transactions of AIJ)   87 ( 800 )   966 - 975   2022.10

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    Language：Japanese   Publisher：Architectural Institute of Japan  

    In the precast reinforced high-strength spun concrete piles, (PRC piles), a numerical model on ultimate flexural condition has not been established when PRC piles have high axial force. The numerical analysis using a multi-spring model was conducted to reproduce the experimental results of six PRC pile specimens with axial force ratio ranging 0~0.313 in compression. The backbone curves of lateral load−drift angle relations were well simulated with this numerical model until ultimate condition. Furthermore, the scale effect was also investigated to see the moment capacity and post peak behavior from parametric study.

    DOI： 10.3130/aijs.87.966

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  • Experiment on Concrete Piles Using Large Scale Loading Apparatus

    Kono S., Tosauchi Y., Fukuda T., Hayakawa T., Watanabe H., Obara T.

    Concrete Journal   60 ( 9 )   821 - 826   2022.9

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  • Experimental fragility analysis of non-structural rc walls

    Rajbhandar P., Obara T., Kono S.

    Proceedings of the Japan Concrete Institute   44 ( No. 2 )   187 - 192   2022.7

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

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MISC

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Presentations

  • Numerical Analysis of Flexural Performance of Hollow Precast CFST Piles under Varied High Axial Loads

    Nagao K., Esaki H., Jasinda C., Yeow T., Kono S., Mukai D.

    14th International Symposium on Architectural Interchanges in Asia (14 ISAIA)  2024.9 

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    Event date： 2024.9

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  • Numerical Study on Flexural Performance of CFST Piles

    日本建築学会大会学術講演梗概集構造系  2024.9 

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    Event date： 2024.9

    Language：Japanese  

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  • Finite Element Analysis on Flexural Behavior of Square Steel-Tubed Reinforced Ultra-High-Strength Concrete Columns

    日本建築学会大会学術講演梗概集構造系  2024.9 

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    Event date： 2024.9

    Language：Japanese  

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  • Bending Performance of SC Piles under Varying High Axial Force

    日本建築学会大会学術講演梗概集構造系  2024.9 

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    Event date： 2024.9

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  • Evaluation for Shear Capacity of CFST and hollow CFST Piles

    日本建築学会大会学術講演梗概集構造系  2024.9 

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    Event date： 2024.9

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  • Evaluation of yield point using concrete compression fiber strain for unbonded post-tensioned precast concrete walls

    日本建築学会大会学術講演梗概集構造系  2024.9 

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    Event date： 2024.9

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  • Evaluation of Shear force corresponding to arbitrary residual crack width for RC beams, Part1 Verification of assumptions

    日本建築学会大会学術講演梗概集構造系  2024.9 

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    Event date： 2024.9

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  • Evaluation of Shear Force Corresponding to Arbitrary Residual Shear Crack Width in RC Beams

    Onodera K., Hishikawa Y., Rajbhandari P., Yeow T., Kono S., Nakano H.

    14th International Symposium on Architectural Interchanges in Asia (14 ISAIA)  2024.9 

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    Event date： 2024.9

    Language：English  

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  • Evaluation of Shear Capacity of Steel Encased Concrete Piles

    Watanabe Y., Jasinda C., Kono S., Kobayashi K., Yeow T.

    14th International Symposium on Architectural Interchanges in Asia (14 ISAIA)  2024.9 

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    Event date： 2024.9

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  • Drift capacity of RC beams with curtailed longitudinal reinforcement and 1275MPa-class shear reinforcement

    Okazaki S., Hishikawa Y., Rajbhandari P., Yeow T., Kono S., Mukai D., Nakano H.

    14th International Symposium on Architectural Interchanges in Asia (14 ISAIA)  2024.9 

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    Event date： 2024.9

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  • 3D-FEM Simulation of Flexural Behavior of Square Steel-Tubed Reinforced Ultra-High-Strength Concrete Columns under Constant Axial Compressive Load

    Hamada N., Hirata N., Jasinda C., Kono S., Mukai D., Yeow T.

    14th International Symposium on Architectural Interchanges in Asia (14 ISAIA)  2024.9 

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    Event date： 2024.9

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  • Numerical Simulation of Flexural Performance of CFST Piles

    Kuroda R., Bhusal S., Jasinda C., Yeow T., Kono S., Mukai D., Imai Y.

    14th International Symposium on Architectural Interchanges in Asia (14 ISAIA)  2024.9 

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    Event date： 2024.9

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  • Backbone curves evaluation for unbonded post-tensioned precast concrete walls using multi-spring model

    Matsuzawa H., Akita Y., Rajbhandari P., Yeow T., Tani M., Kono S.

    14th International Symposium on Architectural Interchanges in Asia (14 ISAIA)  2024.9 

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    Event date： 2024.9

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  • Structural performance of concentrically loaded hollow high-strength precast CFST piles

    Jasinda C., Kono S., Obara T., Mukai D., Yamaji M.

    Eighteenth World Conference on Earthquake Engineering (18 WCEE)  2024.7 

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    Event date： 2024.7

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  • Flexural strength-calculation methods for concrete-filled steel tubes with large D/t

    Subedi N., Bhusal S., Kono S.

    Eighteenth World Conference on Earthquake Engineering (18 WCEE)  2024.7 

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    Event date： 2024.7

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  • Fragility analysis of non-structural reinforced concrete walls

    Rajbhandari P., Obara T., Kono S.

    Eighteenth World Conference on Earthquake Engineering (18 WCEE)  2024.7 

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    Event date： 2024.7

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  • Flexural performance of hybrid;beam system with;slab-web interface

    Singh R., Sato Y., Sasaki H., Kono S.

    Eighteenth World Conference on Earthquake Engineering (18 WCEE)  2024.7 

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    Event date： 2024.7

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  • Nonlinear behavior of concrete piles and reinforced concrete foundation members

    Kono S., Obara T., Subedi N., Oktiovan Y., Thusoo S., Mukai D.

    Eighteenth World Conference on Earthquake Engineering (18 WCEE)  2024.7 

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    Event date： 2024.7

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  • Flexural performance of hollow precast cfst piles under varied high axial loads

    Nagao K., Esaki H., Jasinda C., Kono S.

    The 8th Tongji-TIT Joint Workshop on Building and Civil Engineering between Tongji and Tokyo Tech  2024.6 

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    Event date： 2024.6

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  • Estimation of allowable shear force considering residual shear crack width limits in RC beams

    Okazaki S., Onodera K., Yeow T., Kono S.

    The 8th Tongji-TIT Joint Workshop on Building and Civil Engineering between Tongji and Tokyo Tech  2024.6 

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    Event date： 2024.6

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  • Analytical Limit State Prediction of Lightly Reinforced Concrete Walls

    Rajbhandari P., Kono S., Obara T., Mukai D.

    The 16th Japan Earthquake Engineering Symposium  2023.11 

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    Event date： 2023.11

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  • NUMERICAL SIMULATION OF CONCRETE FLEXURAL DAMAGE OF A FULL SCALE FIVE STORY REINFORCED CONCRETE BUILDING WITH WING WALLS

    OBARA Taku, KONO Susumu, MUKAI Tomohisa

    Journal of Structural and Construction Engineering (Transactions of AIJ)  2023.1  Architectural Institute of Japan

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    Event date： 2023.1

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    The social demands on the building performance are not only to secure human lives but also to keep the original functions during and after hazards. Engineers have been developing resilient building structural systems and design methods that explicitly quantify damage levels of members, that is, limit states of members. In this study, numerical analysis using a multi-spring model is conducted to predict the damage level of a real scale five-story reinforced concrete building tested in BRI in 2014 so that the obtained information may be used to evaluate the cost of repair after earthquakes.

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  • PC梁柱接合部の力学的性状に及ぼす鋼材種別の影響

    岳 偉, 足立 将人, 西山 峰広, 河野 進

    コンクリート工学年次論文報告集  2002  日本コンクリート工学協会

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    Event date： 2002

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    丸鋼,異形PC鋼棒およびストランドをそれぞれ用いたPC梁・外柱接合部試験体を作製し,静的漸増繰返し載荷実験を行い,これらの鋼材種別がせん断抵抗,破壊性状などの接合部の性状に及ぼす影響を実験的に把握した。また,これらの鋼材を用いて引き抜き試験を行い,付着一すべり関係を得た。これらの実験結果から,普通強度鉄筋量が多いRCに近いPC梁柱接合部では鋼材種別の影響はほとんど見られなかった。

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    Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10637644

  • 軸力と2方向曲げを受ける実大RC柱の損傷評価，,

    河野 進, Hakim Bechtoula, 角 徹三, 渡辺 史夫

    コンクリート工学年次論文報告集  2002  日本コンクリート工学協会

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    Event date： 2002

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    一辺600mmの正方形断面を持つ鉄筋コンクリート隅柱の柱脚部モデル試験体4体を用いて多軸載荷実験を行い,変動軸力及び水平2方向載荷が塑性ヒンジ部における損傷の進展状況に与える影響を確認した.実験で得られたモーメント及び軸歪と曲率の関係は,ファイバーモデルを用いてかなりの精度で予想することが可能であった.しかし,変動軸力を受ける柱の終局限界ヒンジ回転角や,ひび割れ・圧壊の進展予想には、実験結果をさらに集積する必要がある.

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    Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10637579

  • PC鋼より線の付着応力－すべり－ひずみ関係に関する実験的研究

    足立 将人, 西山 峰広, 河野 進

    コンクリート工学年次論文報告集  2002  日本コンクリート工学協会

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    Event date： 2002

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    7本よりPC鋼より線をコンクリートブロックに埋め込んだ試験体を作成し,単調引き抜き載荷実験を行い、PC鋼より線の基本的な付着性状を得た。実験変数はグラウト強度及び付着区間自由端の境界条件とした。実験結果より,引き抜き載荷時に発生するPC鋼より線の鋼材ひずみの大きさが,付着降伏点以降の付着性状に影響を与えることが分かった。また,付着降伏応力度とグラウト強度との相関性について既往のモデルとの比較検討を行った。

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    Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10637650

  • Stress-strain relation of confined concrete under dynamic loading

    S Kono, F Watanabe, A Kajitani

    FRACTURE MECHANICS OF CONCRETE STRUCTURES, VOLS 1 AND 2  2001 

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    Event date： 2001

    Language：English  

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Works

  • Seismic performance of High Strength Concrete

    2005 - 2006

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  • 高強度ＲＣ柱の耐震安全性に関する研究

    2005 - 2006

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  • 2001年インド西部地震被害調査

    2001

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  • 1999年トルコ・コジャエリ地震被害調査

    1999

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  • 1999年台湾・集集地震被害調査

    1999

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  • 1995年兵庫県南部地震被害調査

    1995

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Awards

  • 平成8年度（第20回）斎藤記念プレストレスト･コンクリート 技術研究奨励基金研究助成

    1996  

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    Country：Japan

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Research Projects

  • Development and Verification of Advanced Concrete Pile Systems with Axial Load Retention as a Fundamental Design Premise

    Grant number：25H00765  2025.4 - 2028.3

    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：\46800000 （ Direct Cost: \36000000 、 Indirect Cost：\10800000 ）

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  • Design Method of RC Beam with Openings, Cut-off Longitudinal Bars, and Lap Splice by Considering Combined Failure Mode

    Grant number：19H02282  2019.4 - 2022.3

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

    Nishimura Koshiro

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    Grant amount：\17160000 （ Direct Cost: \13200000 、 Indirect Cost：\3960000 ）

    Openings for plumbing are often constructed in the reinforced concrete beam, and the beam may suffer damages when the building is subjected to a strong earthquake. We conducted the experimental tests to investigate the influences of the number and location of the openings, cut-off longitudinal bars, and lap splices on the structural performance of the RC beam. The measurement method using MEMS accelerators were also verified in the tests. The numerical model of the RC beam was analyzed by the Finite Element Method to discuss the compressive stress transfer in concrete. We proposed the design method for the portions with the opening and without the opening of the RC beam based on the experiment and the numerical results.

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  • Seismic performance of concrete piles and pile caps under large earthquakes

    Grant number：19H00789  2019.4 - 2022.3

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

    Kono Susumu

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    Grant amount：\45890000 （ Direct Cost: \35300000 、 Indirect Cost：\10590000 ）

    The purpose of the study is the seismic performance of concrete piles and pile caps under large earthquakes and the proposal of a design method for large earthquakes.
    The flexural performance of different types of concrete piles was studied from a series of tests. It was confirmed that a proposed multi-spring model is able to simulate the hysteresis relations with good accuracy.
    The flexural behavior of a pile in a pile cap was studied from the experiment by changing pile-cap size, amount of shear reinforcement, and type of transverse reinforced above the pile top interface. The study clarified the contribution to the bending capacity from two actions: the plying action of the embedded pile and the bending action from anchored steel reinforcement.

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  • Elucidation of dynamic punching shear strength improvement mechanism of RC plates by confining pressure effects and its resistance evaluation model

    Grant number：17K06549  2017.4 - 2020.3

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

    FUJIKAKE KAZUNORI

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

    The aim of this study was to find out the punching shear failure mechanism of RC slabs subjected to in-plane confining pressures and to develop an evaluation model for estimating the punching shear resistance through experimental investigation and nonlinear finite element analysis. As a result, it was found that triaxial compression region was formed in the vicinity of the loading plate, and the compression failure of concrete in this region caused punching shear failure of the RC slab. Therefore, a pyramid shell model was newly developed based on the load bearing mechanism formed around the vicinity of the loading plate.

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  • Failure process of pile foundation considering axial load variation during strong earthquakes and evaluation of ultimate limit state

    Grant number：16H02374  2016.4 - 2020.3

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

    TAMURA Shuji

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    Grant amount：\44330000 （ Direct Cost: \34100000 、 Indirect Cost：\10230000 ）

    To establish a seismic design method of pile foundations for strong earthquakes, pile behavior in ultimate limit state was investigated by both geotechnical engineering and structural engineering. For this purpose, geotechnical centrifuge tests, static loading tests and numerical analysis were performed. The shaft resistance along a pile under combined horizontal and vertical loadings, effects of bending stiffness of a footing beam and pile tip’s support condition on pile stress in a group, pile settlement under cyclic loading, moment-curvature relations and shear capacities of precast and cast-in-site concrete piles, the ultimate strength of steel piles considering the M-N interaction curve according to design criteria and elasto-plastic buckling strength and pile behavior in ultimate limit state were investigated.

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  • Developement of damage controlling reinforced concrete walls

    Grant number：16H02373  2016.4 - 2019.3

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

    Kono Susumu

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    Grant amount：\45110000 （ Direct Cost: \34700000 、 Indirect Cost：\10410000 ）

    Resiliency of buildings has been becoming an important design issue in addition to safety. Rocking system using post-tensioned precast concrete walls is considered suitable to provide resiliency to buildings in seismic area. Reinforced concrete rocking wall system was tested to prove its enhanced performance in damage controlling ability. The numerical modelling scheme was developed to simulate damage of concrete and reinforcement in addition to load-displacement relations. The new structural system is expected to perform well to achieve quick recovery and continuity of building functions in addition to safety.

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  • Development of seismic upgrade techniques for building with post-earthquake functional use

    Grant number：26242035  2014.4 - 2017.3

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

    Mukai Tomohisa, FUKUYAMA Hiroshi, KONO Susumu, HASEGAWA Takashi, MATSUMOTO Yuka, IIBA Masanori, HIRADE Tsutomu, HIJIKATA Katsuichirou, KISHIDA Shinji

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    Grant amount：\42380000 （ Direct Cost: \32600000 、 Indirect Cost：\9780000 ）

    The objective of study is to develop the seismic upgrade technique for existing crucial RC buildings such as governmental office and gymnasium and following items is carried out;
    (1) propose of damage evaluation method and seismic upgrade techniques to mitigate severe damage for vulnerable elements, (2) evaluation of seismic upgrade effect for frame level, (3) application of seismic upgrade method for building with post-earthquake functional use
    As a result of these investigations, each technique to mitigate severe damage under severe earthquake for RC non-structural walls, joints between RC column and steel roof and concrete piles is developed and the effectiveness of each technique is confirmed. Moreover seismic upgrade method to guarantee the post-earthquake functional use of existing crucial building is proposed and some evaluation examples to verify the method are shown.

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  • Ultimate drift capacity and damage evaluation of RC walls

    Grant number：25289180  2013.4 - 2016.3

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

    Kono Susumu, SHINOHARA Yasuji, WATANABE Hidekazu, MUKAI Tomohisa, TANI Masanori, MARUTA Makoto, SAKASHITA Masanobu

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    Grant amount：\18070000 （ Direct Cost: \13900000 、 Indirect Cost：\4170000 ）

    In order to simulate compression controlled flexural failure, a fiber based model was constructed and calibrated using series of experimental studies conducted on reinforced concrete walls last several years in Japan. Then a parametric study was carried out with the fiber based model to simulate the hysteresis curves of walls to see effects of three variables on the load and drift level of characteristic points of a backbone curve. Three variables were concrete compressive strength (30MPa,45MPa, 60MPa), confining reinforcement ratio in boundary regions (1.1% - 3.2%) and axial load ratio (0% - 50%). The parametric study showed that three variables have different degree of influences on the features of backbone curves and the axial load ratio is the most influential factor on the ultimate drift capacity.

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  • Evaluation and improvement of impact load resistance of reinforced concrete walls

    Grant number：25249079  2013.4 - 2016.3

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

    TANAKA HITOSHI, NISHIYAMA Minehiro, TANI Masanori, MARUYAMA Takashi, FUJIKAKE Kazunori, KONO Susumu, WATANABE Hidekazu, SUZUKI Norio

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    Grant amount：\45630000 （ Direct Cost: \35100000 、 Indirect Cost：\10530000 ）

    In order to design tsunami-resistant RC buildings, development of design methods for debris impact loads is necessary. In this study, impact tests were conducted using a lateral impact loading system to evaluate the performance of RC buildings. Thirty-six RC wall specimens were tested to investigate the effects of impact load on local damage. Damage of specimens was classified as penetration, scabbing, and perforation. The limit impact velocity for scabbing and perforation was evaluated by proposed equations which was modified from Hughes' equations. The proposed equations evaluated the limit impact velocity for scabbing and perforation with good accuracy.

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  • Development of Structural Design Procedure of Buildings Harmonizing Damage Control Seismic Design and Fire Design Based on Constitutive Laws of Materials and Deformation Analyses

    Grant number：23246101  2011.4 - 2014.3

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

    NISHIYAMA Minehiro, HIRASHIMA Takeo, KONO Susumu, HARADA Kazunori, SAKASHITA Masanobu, TANI Masanori

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    Grant amount：\31460000 （ Direct Cost: \24200000 、 Indirect Cost：\7260000 ）

    Steel and concrete as structural materials used for buildings were investigated at elevated temperatures, to design building structures not to collapse, and to predict damage on structural members during and after fire. Stress - strain relationships of these materials, and their bond - slip relationships were idealized on the basis of experiments and numerical analyses. Beam - column assemblages were tested at elevated temperatures. The results were compared with the numerical analysis ones. A new test method using a small furnace was developed for a beam-column subassemblage. Finally, an influence of crack on temperature distribution in reinforced concrete members was experimentally and analytically studied.

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  • Building structural system to maintain structural functions during earthquakes and rapid recovery afterward

    Grant number：20246090  2008 - 2011

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

    TANAKA Hitoshi, NISHIYAMA Minehiro, KONO Susumu, TAMURA Shuji, SAKASHITA Masanobu, SHIOHARA Hitoshi, TERAOKA Masaru

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    Grant amount：\47450000 （ Direct Cost: \36500000 、 Indirect Cost：\10950000 ）

    A high performance RC building structural system has been constructed in order to maintain structural functions based on experiments and numerical analyses. To conclude the works in the project, a real scale four story post-tensioned precast concrete building was tested on the E-defense shaking table as a part of the collaborative US-Japan project. The structure shows excellent performance for various intensity of simulated earthquakes. Interstory drifts were minimal during the shaking and residual displacements and cracks were almost zero to achieve a damage control system. Unfortunately, the stiffness decreased dramatically for a Level 2 earthquake since bases of columns and walls had spalling of cover concrete. However, it was confirmed that the stiffness degradation could have been prevented by supplying fiber reinforced concrete at bases of columns and walls.

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  • Damage-controlling prestressed precast concrete building system using high performance materials

    Grant number：20360252  2008 - 2010

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

    KONO Susumu, TANAKA Hitoshi, NISHIYAMA Minehiro, TAMURA Shuji, SAKASHITA Masanobu, SHIOHARA Hitoshi, TERAOKA Masaru

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    Grant amount：\19110000 （ Direct Cost: \14700000 、 Indirect Cost：\4410000 ）

    Sixteen column and eleven beam model specimens with high performance materials were tested to investigate their flexure and shear behaviors. Their failure mode and capacity can be simulated by combining proposed assessment procedures. Test results and numerical simulation of two post-tensioned precast portal frame model specimens proved the effectiveness of damage controlling prestressed precast building system using high performance materials.

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  • Comprehensive study of the damage caused by the 2008 Great Sichuan Earthquake

    Grant number：20900002  2008

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

    KONAGAI Kazuo, CHIGIRA Masahiro, SHIOHARA Hitoshi, HIRATA Naoshi, MORI James J., KUWAHARA Yasuto, FURUYA Masato, SUN Wenke, IKEDA Yasutaka, ATSUMI Tomohide, KAMAI Toshitaka, FUKUOKA Hiroshi, WANG Fawu, TAKAHASHI Yoshikazu, OHMACHI Tatsuo, KAWASHIMA Kazuhiko, KONO Susumu, KABEYASAWA Toshimi, NAKANO Yoshiaki, MIYAZAWA Masatoshi, TOBITA Mikio, SHIMADA Masanobu, KANO Kenichi, LIN Weiren, TATANO Hirokazu, YAMORI Katsuya, KAJITANI Yoshio

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  • Use of corrugated steel shear panel in reinforced concrete building structures as a main lateral force resisting component

    Grant number：18560549  2006 - 2007

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

    KONO Susumu, WATANABE Fumio, TANAKA Hitoshi, NISHIYAMA Minehiro, SATOH Yuichi, KANAO Iori

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    Grant amount：\3890000 （ Direct Cost: \3500000 、 Indirect Cost：\390000 ）

    In order to make an economical seismic response controlling system by securing a ductile failure mode of structural walls, a hybrid system using corrugated steel shear panel proposed by Mo and Perng in 2000 was revised to make it effective in dissipating seismic energy in practice. In this study, the hybrid system with corrugated shear panel was revised to prove that the shear capacity and the shear stiffness of corrugated steel shear panels were fully utilized with sufficient anchorage at the interface between surrounding RC members and shear panels. In an experimental phase, a stud-type anchorage often used in bridge box girders was employed in four half-scale specimens and static cyclic loading was applied. The behavior was stable if the number of studs satisfied the Japanese design guidelines. The behavior after buckling of the corrugated panel was ductile and degradation in lateral load carrying capacity was about 20% even at 5% drift angle. However, even specimens with half number of studs showed the similar behavior. All hybrid frames showed more than 30% increase in lateral load carrying capacity from the original RC frame. In an analytical phase, a nonlinear frame analysis was conducted to evaluate the effect of corrugated steel shear panel on the performance of the reinforced concrete frame. The analysis simulated the behavior of frames with different fixity of the shear panels well. Design method to optimize the amount of anchorage due to shear capacity of frames and corrugated steel shear panels is established with this analysis model.

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  • Development of precast prestressed concrete structures with damage controlling capability usingy energy dissipaters at the interface between members

    Grant number：16360276  2004 - 2007

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

    TANAKA Hitoshi, WATANABE Fumio, NISHIYAMA Minehiro, KONO Susumu, KURAMOTO Hiroshi, SHIOHARA Hitoshi

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    Grant amount：\15870000 （ Direct Cost: \15000000 、 Indirect Cost：\870000 ）

    Energy dissipating devices were placed at the interface between precast concrete members to take advantage of gap openings at the interfaces. Gap openings are ordinarily considered to be disadvantage of precast prestressed concrete structures but the damage control system utilizes this characteristics. The proposed precast prestressed structural system can minimize the response displacement during the seismic event and the residual displacement after that due to the self-centering characteristics of the system.
    A corrugated shear panel was used as an energy dissipating devices. The corrugated shear panel has large shear stiffness and negligible axial stiffness, and hence, it is easy to optimize its size and location in the structural system. The shear panels are placed between beams as intermediate columns. The experimental results and analytical model demonstrated that the shear panels efficiently dissipate seismic energy but does not inhibit the self-centering function of the precast prestressed concrete structures.
    A simple procedure was proposed to predict the seismic response of multistory building structures using capacity design spectra. The procedure considers the procedure to simplify the system, MAP analytical procedure, and the higher mode effects and multiple damping effects in a equivalent single degree of freedom system.
    A post-tenstioned connection system was proposed so that the precast concrete members can be reused in the future. Experiment was conducted to quantify the shear capacity, disassembling capability, and the reusability.
    An equation to predict the residual displacement was proposed for the prestressed concrete members and structures. The equation is based on the equilibrium and the plastic hinge length. The effect of prestressing tendons are also explicitly expressed in the equation.

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  • Seismic retrofit schemes for RC building structures using displacement controling devices without bolt anchorage

    Grant number：16560497  2004 - 2005

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

    KONO Susumu, WATANABE Fumio, TANAKA Hitoshi, NISHIYAMA Minehiro, SATO Yuichi, KANAO Iori

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    Grant amount：\3700000 （ Direct Cost: \3700000 ）

    After major earthquakes in big cities in 1990's, the seismic upgrading of existing buildings have been attracting more attention than ever. However, many existing buildings have not had seismic upgrading since construction cost is high due to intensive labor work and the buildings are out-of service during construction. This research aims to propose a simple seismic strengthening method which satisfies a) no wet concrete work, b) no rebar or bolt anchorage, c) short construction period, and d) low construction cost. For this purpose, a precast prestressed concrete brace system has been developed to demonstrate its efficiency experimentally and analytically.
    In an experimental phase, two identical half scale portal frames were constructed based on the old Japanese building standard and strengthened with propose bracing system with different section dimensions. Both frames showed more than 70% increase in lateral load carrying capacity and the efficiency of the bracing system was proved. Additional experiment was carried out on four 1/3 scale beam-column-brace joint models to evaluate the shear and bearing strength. In an analytical program, the nonlinear and dynamic frame analyses have been conducted to evaluate the effect of end fixity and out-of-plane deformation of braces on the performance of braced frames. It was shown that the failure mode of braced frames involved the tension failure of the first story column due to the cantilever action, buckling or crushing of concrete brace, axial tensile failure of beams, and the bearing failure at joints. Based on the experimental and analytical results, economical and simple strengthening procedure using concrete brace and its design method is proposed. The proposed system can be applied to new buildings instead of using shear walls. A few retrofitted and newly strengthened buildings using the proposed method are introduced.

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  • Economical seismic retrofit of rc building structures

    2004

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    Grant type：Competitive

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  • 既存不適格RC構造物の耐震補修

    2004

    科学研究費補助金 

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    Grant type：Competitive

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  • A study on the seismic force resisting mechanism of a multi-story shear wall system considering the interaction between wall, slab, foundation beam, and pile elements

    Grant number：14550567  2002 - 2003

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

    KONO Suzumu, SHIOHARA Hitoshi, MOROOKA Shigehiro, TANAKA Hitoshi, KURAMOTO Hiroshi, KAKU Tetsuzo

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    Grant amount：\4200000 （ Direct Cost: \4200000 ）

    In current design procedures, cantilever structural walls are normally assumed to stand on a solid foundation, and the foundation beams, slabs and piles are designed separately without considering their interactions. This is because their interactions have not been thoroughly studied for its complexity. Also neglected in the practical design is the fact that shear transfer mechanisms along the wall base vary depending on the crack patters and inelastic deformation levels. This study aims to experimentally clarify the variation of the lateral load resisting mechanisms considering the interaction between a shear wall, foundation beams, slabs and piles, and to establish more rational design procedures for each structural component.
    Four 20% scale specimens were designed and constructed as basic structural assemblage models extracted from a practical six-story shear wall system. Those specimens consisted of a bottom two-story part of the shear wall system, a foundation beam, slabs, and two piles. Static lateral load was applied with proportionally varying vertical load to simulate loading conditions of the prototype six-story shear wall system under earthquakes.
    It was found that contribution of dowel action and aggregate interlock to the shear transfer mechanism at the shear wall base varied as the inelastic deformation of the shear wall increased. Also, unexpectedly large shear-flexural deformation of the foundation beam was observed due to the axial tension force induced by the pile action which is controversial in a practical design. It was also found that significantly large area of the slab worked together with the foundation beam to equilibrate shear force in the piles. Based on the test results and accompanied theoretical analyses, a rational design method of a cantilever structural wall system is to be proposed.

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  • Interaction between upper structures and foundations under seismic forces

    2002

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    Grant type：Competitive

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  • 上部構造と下部構造の地震時相互作用を考慮したＲＣ構造物耐震設計法の確立

    2002

    科学研究費補助金 

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    Grant type：Competitive

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  • 梁・柱接合部内におけるPC緊張材の付着性状に関する研究

    Grant number：12750511  2000 - 2001

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    河野 進

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

    PC構造物のさらなる普及を図る為には様々な課題が残っているが、これらの課題に共通しているPC構造物の根本的な問題の一つは、PC鋼材の滑りと付着応力の関係(以下S-S関係)及び付着特性を明らかにすることである。特に、接合部におけるPC鋼材の付着性能は、部材の塑性回転量、接合部のせん断耐力、圧着梁端部のせん断耐力、大変形時の履歴復元力特性などに直接影響を与えるため、その定量化が早急に望まれる。そこで、本研究の目的は、地震力を想定した繰り返し載荷を受ける梁・柱接合部内におけるPC鋼材の付着特性を明らかにし、これをモデル化することである。
    そこで本年度は、7本よりPC鋼より線をコンクリートブロックに埋め込んだ試験体を作成し,単調引き抜き載荷実験を行い、PC鋼より線の基本的な付着性状を得た。実験変数はグラウト強度及び付着区間自由端の境界条件とした。実験結果より,(1)グラウト強度が高いほど,付着降伏応力度及び付着降伏点すべり量は大きくなったが,付着降伏点剛性には大きな違いは見られなかった。但し付着降伏応力度-グラウト強度関係を是永らの提案式と照合した結果,実験値は提案式の値を下回った。
    (2)PC鋼より線の付着応力-すべり関係では,付着降伏以降一旦付着応力は低下し,再び上昇するが,グラウト強度が高いほど,また自由端側の鋼材ひずみとすべりの比が小さいほど,その低下量及び再び上昇する剛性は大きくなる傾向が見られた。

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  • International Joint Research on Earthquake Disaster Mitigation of Buildings in Republic of Korea

    Grant number：12650571  2000 - 2001

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

    NISHIYAMA Minehiro, SUITA Keiichiro, KONO Susumu, WATANABE Fumio

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    Grant amount：\1000000 （ Direct Cost: \1000000 ）

    The Korean seismic design provision was developed in 1988. In present seismic design for building is compulsory in Korea. The seismicity of Korean peninsula is between low and moderate. Basically the Korean seismic provision was developed based on Uniform Building Code and ATC 3-06 provision. One of the objectives of this research is to investigate the relationship between the seismic design method in Korean seismic provision and ISO 3010. The major parameters included in both provisions were classified and compared. They are seismic intensity, importance factor, seismic hazard zone factor, strength reduction factor, and spectral ordinates. The vertical distribution of seismic force and shear of two provisions is also investigated and compared. Based on the investigation it is concluded that the most prominent difference between these two provisions is the limit states under consideration. In ISO 3010 two limit states are explicitly considered which are for serviceability and ultimate. In Korean provision one limit state is considered which is ultimate limit state. However, the provision in progress of revision considers two limit states for operation and collapse prevention.
    The Korea Ministry of Construction and Transportation and The Earthquake Engineering Society of Korea established a new guideline for performance-based seismic design in 1997. In the guideline the seismic coefficients for construction of the design spectrum were provided for double performance levels, functional and collapse prevention performance levels, and for earthquakes with various recurrence periods. In this study a steel framed structure was designed in accordance with the conventional single-level seismic design code, and was analyzed using capacity spectrum method to evaluate the nonlinear performance of the structure subjected to the strong earthquake load corresponding to the collapse prevention performance objective. The maximum inter-story drift was compared with the performance criteria specified in the new guideline to check whether the building structure designed in accordance with the conventional design code satisfy the performance criteria recommended by the new performance-based seismic design guideline. It was found that the model structure, although designed for the conventional single level earthquake load, retains enough margin for safety for the earthquake load of 2,400 year return period (earthquake level for collapse prevention performance objective). It was also found that for the given model structure the results from the capacity spectrum method generally coincide well with those obtained from the time history analysis.

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  • Prediction of the behavior and damage of RC members subjected to various loadings

    Grant number：11305039  1999 - 2002

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

    WATANABE Fumio, SATOU Yuichi, KONO Susumu, NISHIIYAMA Minehiro

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    Grant amount：\24670000 （ Direct Cost: \23200000 、 Indirect Cost：\1470000 ）

    Experiments were conducted on the post-tensioned external beam-column joints with different types of tendons to investigate the their effects on the shear behavior. The shear strength of the joint exceeded the value based on the equation on the AIJ design guidelines. Another experiments were conducted on the RC knee and T joints to investigate the effects of anchorage length and transverse reinforcement in joints on the shear strength. Corner beam-column joints were also tested to see the effect of bidirectional bending
    Cantilever columns was tested under triaxial stress state to clarify the performance of a plastic hinge of reinforced concrete columns in order to increase the accuracy of prediction procedure to evaluate damage when columns experience large axial force and cyclic reversal bilateral deformations. In an experimental program, eight half scale columns and eight full scale columns were tested under the reversal bilateral displacement with constant or variable axial force in order to study the effects of loading history and intensity on the damage progress. Damage was severe for specimens under bilateral displacement with high axial force. In an analytical program, a section analysis using a fiber model was employed and the effect of confinement on the behavior of core concrete was studied.
    Eight prestressed concrete beam-column joint assemblages were constructed. The experimental parameters for the first four test units were location of the anchorage plate and the diameter of the tendons. For the other four test units, three types of prestressing steel were used: round bars, strands and deformed bars. They were used for investigating the effect of bond characteristics on load-displacement curves of the test units. The test results indicated that the location of the anchorage plates had significant influence on maximum loading capacity and hysteretic loops. Effect of difference in the tendons was not noticeable.

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  • Mechanical Properties and Stress Transfer Characteristics of Reinforcement Materials for Concrete Demanded by Structural Performance of Frame and Members

    Grant number：11450208  1999 - 2001

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

    TASAI Akira, KONDO Goro, KONO Susumu, NAGATA Masayuki

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    Grant amount：\14100000 （ Direct Cost: \14100000 ）

    Experimental and analytical investigations were conducted on the mechanical characteristics of hybrid RC members reinforced by continuous fibers. The members consisted of different kinds of reinforcement with respect to strength, elastic modulus, hysteric response and ductility. The properties related to flexural, shear and bond characteristics were mainly discussed. Carbon fibers were more effective than aramid fibers to reinforce concrete members, because the high elastic modulus of carbon fibers performed to prevent expanding of cracks. Conventional formulas recommended in AIJ guidelines or formulas by modified compression field theories overestimated the shear strength of hybrid RC members. However, analysis based on truss analogy combined with sector truss mechanism considering bond stress distribution along main steel rebar well-predicted experimental results, Experimental and analytical investigations were also conducted to study development of damages in hinge zones of reinforced concrete columns. Sufficient confinement for hinge zones was significantly effective to control the deterioration of bending moment capacity to be small. Simple inelastic section analysis considering confinement for concrete predicted the observed moment vs. curvature and axial strain vs. curvature relationships precisely. Accurate formula to estimate anchorage strength of main rebar anchored mechanically into RC members was proposed in case of side-splitting failure of concrete around the rebar.

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  • 高強度材料を用いた接合面のせん断伝達性能に関する研究

    Grant number：10750430  1998 - 1999

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    河野 進

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    Grant amount：\2100000 （ Direct Cost: \2100000 ）

    本研究では、打設時期が異なるコンクリートが接合筋を介して接続された接合面におけるせん断力伝達性能を,部材モデルを用いた直接せん断実験により評価した。用いた材料はコンクリート圧縮強度が30MPa,鉄筋降伏強度が350MPaから1000MPaの範囲であり,3シリーズ・計52体の実験体を用いた直接せん断実験から特に高強度材料がせん断力伝達性能に与える影響について調べた。
    実験結果から、高強度材料を用いた場合の最大せん断耐力は,普通強度材料を対象とした既往の耐力式を用いても精度良く予想できないこと、接合筋の拘束によるコンクリートの摩擦項とコンクリートの粘性項にあたる定数項の和として表現すればよいことを確かめた。ただし、実験において800MPaを超える高強度の接合筋は最大耐力時に降伏しておらず、接合筋が与える拘束力は最大せん断耐力時の接合筋実応力を用いなければならない。これを基に、洗い出し,短形コッター,三角コッター,一体打ちの接合面仕上げに対して適用できる最大せん断耐力の予想式を提案した。また、接合面が正負繰り返し載荷を受ける場合には、載荷を繰り返すに従って処女載荷の時から徐々にせん断耐力は減少し、最終的にはコンクリートのかみ合い作用は磨耗により消滅してダウエル作用のみで外力に抵抗する。さらに、最大せん断耐力時の滑り量は接合筋の量や降状強度の増加に伴い数ミリ程度になる傾向があり、実際の部材接合部の設計に適用する際においては注意を要する。
    せん断耐力に占めるダウエル作用の寄与分は滑りとともに増加するが,滑りが4mmを越えた後は全体の約5割から8割の間で一定となる。高強度接合筋を用いた場合は,滑りの小さいときからダウエル作用の寄与が大きい傾向がある。ダウエル作用により伝達されるせん断力は,コンクリート強度に影響を受けないが、コンクリートのかみ合いにより伝達されるせん断力の大きさは接合面の凹凸が大きくなるに従い、コンクリート強度の影響を受ける。
    また、接合面の粗さを様々に変化させた実験から,接合面の粗さは滑りに伴って変化する開き量に影響を与え、開きは滑りと伴に伝達されるせん断力に大きく影響することが分かった。これは,ダウエル作用及びコンクリートのかみ合い作用により伝達される2種類のせん断力に共通する。但し,接合面の力学的挙動を説明する為に有用な接合面の粗さ指標は見つけられなかった。

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  • 鉄筋コンクリート構造物の損傷評価

    1998

    科学技術振興調整費による総合研究 

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    Grant type：Competitive

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  • Performance based design or reinforced concrete structures

    1998

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    Grant type：Competitive

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  • Experimental Study on Seismic Strengthening of Timber Beam-Column Joints by Lateral Confinement

    Grant number：09650624  1997 - 1998

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

    TANAKA Hitoshi, KONO Susumu

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    Grant amount：\2800000 （ Direct Cost: \2800000 ）

    The beam column joints of a timber structural frame are subjected to axial force, shear force and flexural moment during earthquakes. In this study, two methods have been proposed to strengthen the bolt joints subjected to axial tension force. One method is to laterally confine the joints using a square hoop made of GFRP (glass fiber reinforcedplastics) and the other is to restrain the splitting of the joints using a transverse bolt with two large square washers. The effectiveness of those methods have been investigated by conducting axial tension tests on the joints.
    For the tests, 91 cedar columns with 105mm square section were prepared with the bolt connectors, which was called super-joints as the trade name. As the experimental variables, the thickness and width of the GFRP square hoops were varied from 5 to 7mm and 20 to 120 mm, respectively. Also, the sizes of the square washers for the transverse bolts were variedas 20x20x3mm^3, 40x40x5mm^3, 60x60x8mm^3. The test results indicated that those GFRP square hoops and the transverse bolts could improve the deformation capability of the joints. In case of the GFRP hoops, not only deformability but also strength of the joints were significantly improved when the width of the hoops were more than 80mm. However, the effectiveness of the transverse bolts were not so appreciable from the view point of a practical use because they became effective only after large deformation of the joints.
    As additional tests, 8 of three-story timber frames with full scale were constructed and tested under horizontal static loads which were applied to each floor level simulating seismic forces. The behaviors of the frames were predicted by frame analyses with the joint models which were established based on the above axial tension tests, The predicted behaviors were well agreed with the observation of the frame tests.

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  • 鉄筋コンクリ-ト及びプレストレストコンクリ-ト構造物の接合部におけるせん断摩擦機構

    1996

    科学研究費補助金 

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    Grant type：Competitive

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  • Shear transfer mechanisms for reinforced concrete and prestressed concrete

    1996

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    Grant type：Competitive

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  • 既存不適格RC構造物の経済的な耐震補強方法の提案

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    Grant type：Competitive

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  • 鉄筋コンクリート構造物の損傷制御と性能評価型設計法の確立

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    Grant type：Competitive

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  • Seismic retrofit of rc building structures

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    Grant type：Competitive

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  • Interaction between upper structures and foundations under seismic forces

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    Grant type：Competitive

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  • RC造上部構造物と下部構造物の相互作用を考慮した水平力抵抗機構

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    Grant type：Competitive

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  • Damage control of reinforced concrete structures for the advanced performance based design method

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    Grant type：Competitive

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