2005 Fiscal Year Final Research Report Summary
A Study of Seismic Design Methods for Steel Structures installed Scarifying Members with functions
| Project/Area Number |
15360236
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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 | Nagoya University |
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Principal Investigator |
USAMI Tsutomu Nagoya Univ., Grad. School of Eng., Professor, 大学院・工学研究科, 教授 (50021796)
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| Co-Investigator(Kenkyū-buntansha) |
ITOH Yoshito Nagoya Univ., Grad. School of Eng., Professor, 大学院・工学研究科, 教授 (30111826)
GE Hanbin Nagoya Univ., Grad. School of Eng., Assoc. Professor, 大学院・工学研究科, 助教授 (90262873)
KASAI Akira Nagoya Univ., Grad. School of Eng., Asst. Professor, 大学院・工学研究科, 講師 (20303670)
AOKI Tetsuhiko Aichi Institute of Technology, Grad. School of Eng., Professor, 工学部, 教授 (70064946)
SUZUKI Moriaki Aichi Institute of Technology, Grad. School of Eng., Assoc. Professor, 工学部, 助教授 (90273276)
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| Project Period (FY) |
2003 – 2005
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| Keywords | Steel Structure / local buckling / seismic control / seismic performance / elasto-plastic analysis / buckling-restrained brace / seismic response analysis / earthauake-resistant design |
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| Research Abstract |
In this study the employment of buckling-restrained braces (BRBs) as energy dissipation dampers is attempted for seismic performance upgrading of steel arch bridges and the effectiveness of BRBs to protect structures against strong earthquakes is numerically studied. With buckling restrained, BRB members can provide stable energy dissipation capacity and thus damage of the whole structure under major earthquakes can be mitigated. Cyclic behavior of such members is addressd with a numerical simulation model, and a strength design method for BRBs is proposed. BRBs are then placed at certain locations on the example steel arch bridge to replace some normal members with two schemes, and the effect of the two installation schemes of BRBs for seismic upgrading is investigated by non-linear time-history analysis under various ground motions representing major earthquake events. Compared with the seismic behavior of the original structure without BRBs, satisfactory seismic performance is seen in the upgraded models, which clarifies the effectiveness of the proposed upgrading method and it can serve as an efficient solution for earthquake-resistant new designs and retrofit of existing steel arch bridges.
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