| Project/Area Number |
16360224
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
KAWASHIMA Kazuhiko Tokyo Institute of Technology, Department of Civil Engineering, Professor, 大学院理工学研究科, 教授 (20272677)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Gakuho Tokyo Institute of Technology, Department of Civil Engineering, Research Associate, 大学院理工学研究科, 助手 (50334545)
MAEKAWA Koichi The University of Tokyo, Department of Civil Engineering, Professor, 大学院工学系研究科, 教授 (80157122)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥14,400,000 (Direct Cost: ¥14,400,000)
Fiscal Year 2006: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2005: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2004: ¥6,500,000 (Direct Cost: ¥6,500,000)
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| Keywords | Disaster prevention / Seismic Design / Seismic retrofit / C bent columns / Seismic Strengthening / Reinforced concrete structures / Seismic response analysis / 1995 Kobe, Japan earthquake |
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| Research Abstract |
C-bent columns are vulnerable under extreme ground motions due to eccentric axial force and bending moment. Once ground excitation becomes extensive, compression failure of column at the plastic hinge is initiated at the compression side resulting in a significant residual drift in this direction. In this study, peculiar seismic response of C-bent columns was clarified based on hybrid loading tests and analysis on reinforced concrete columns. Based on results of loading experiment, a nonlinear hysteretic model was developed to take account of combined bending and torsion under a constant axial force. Two seismic retrofit measures were proposed and developed. Through loading xperiment, effectiveness of those methods for mitigating residual drift in the compression side was verified. Application of finite element method to C-bent columns showed that finite element method predicts peculiar nonlinear hysteretic behavior of C-bent columns with reasonable accuracy. Strong nonlinear seismic response of bridges supported by C-bent columns was analyzed using a nonlinear hysteretic model for combined torsion and flexure which was developed in this study.
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