| 钢框架抗震改造的支撑系统研究 |
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| 作者姓名： | L. Di Sarno A.S. Elnashai |
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| 摘 要： | 评估了不同支撑系统改造的抗弯钢框架的抗震性能。采用3种结构形式:中心支撑框架、防屈曲支撑框架和巨型支撑框架。设计了一横向刚度不足的9层钢框架,满足规范对高地震灾害区域结构的侧移要求。用中心支撑、防屈曲支撑和巨型支撑改造框架,进行非弹性时程分析,评估地震作用下的结构性能。以局部变形(杆件转角)和整体变形(层间及屋顶侧移)为参数,比较改造框架非弹性性能的不同。结果表明:巨型支撑框架是最有效率的支撑系统,其最大层间侧移比抗弯框架低70%,比中心支撑框架低50%。侧移的减小量与地震特性有关,尤其是频率。防屈曲支撑的抗震性能仅稍优于巨型支撑框架,但其总质量更大。巨型支撑框架的杆件和节点用钢量比中心支撑框架低20%,既降低了费用又体现了抗震优势。
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| 关 键 词： | 支撑 防屈曲支撑 钢框架 中心支撑框架 抗弯框架 韧性 抗震改造 性能评估 时程分析 |
Bracing Systems for Seismic Retrofitting of Steel Frames |
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| L. Di Sarno,A.S. Elnashai.Bracing Systems for Seismic Retrofitting of Steel Frames[J].Steel Construction,2011(2):82. |
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| Authors: | L Di Sarno AS Elnashai |
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| Affiliation: | L. Di Sarno and A.S. Elnashai |
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| Abstract: | The present study assesses the seismic performance of steel moment resisting frames(MRFs)retrofitted with different bracing systems.Three structural configurations were utilized:special concentrically braces(SCBFs),buckling-restrained braces(BRBFs) and mega-braces(MBFs).A 9-storey steel perimeter MRF was designed with lateral stiffness insufficient to satisfy code drift limitations in zones with high seismic hazard.The frame was then retrofitted with SCBFs,BRBFs and MBFs.Inelastic time-history analyses were... |
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| Keywords: | Bracing Buckling restrained braces Steel frames Concentrically braced frames Moment resisting frames Ductility Seismic retrofitting Performance assessment Time history analyses |
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