| 横梁未加强型人字撑框架体系的抗侧性能 |
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| 引用本文： | 童根树,罗桂发,张磊.横梁未加强型人字撑框架体系的抗侧性能[J].工程力学,2011(8). |
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| 作者姓名： | 童根树 罗桂发 张磊 |
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| 作者单位： | 浙江大学土木系; |
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| 基金项目： | 国家自然科学基金项目(50908203,51078328) |
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| 摘 要： | 对7组横梁未加强的人字支撑框架进行弹塑性分析,支撑几何长细比从43变化至132,支撑又分承担和不承担竖向重力两种。研究表明重力荷载使支撑提前屈曲,降低了支撑抗侧力峰值,抗震设防烈度越低,其影响越大。通过对整体、支撑和框架的侧力-侧移曲线的分析,解释了设计人字撑横梁时不应考虑跨中支撑点作用的原因,对欧美日等将中等长细比的支撑框架列为抗震性能最差的框架支撑体系提供了解释。揭示了支撑与框架的极限抗侧力不同时出现的重要现象,提出了设计对策;提出了塑性破坏机构,推导了横梁跨中挠度和支撑出平面外位移与层侧移角的关系。
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| 关 键 词： | 人字撑框架体系 抗震性能 双重抗侧力体系 静力弹塑性分析 重力荷载 |
LATERAL RESISTANCE OF CHEVRON-BRACED FRAMES WITH WEAK BEAMS |
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| TONG Gen-shu,LUO Gui-fa,ZHANG Lei.LATERAL RESISTANCE OF CHEVRON-BRACED FRAMES WITH WEAK BEAMS[J].Engineering Mechanics,2011(8). |
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| Authors: | TONG Gen-shu LUO Gui-fa ZHANG Lei |
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| Affiliation: | TONG Gen-shu,LUO Gui-fa,ZHANG Lei(Department of Civil Engineering,Zhejiang University,Hangzhou 310058,China) |
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| Abstract: | The elastic-plastic analysis was performed for seven chevron-braced frames with weak beams,with the brace slenderness varying from 43 to 132.The braces are of two types: carrying and free of gravity load.The effect of gravitational axial force in braces on the lateral resistance of the braced frames was studied.The results showed that the gravity load caused the braces buckle(or yield) earlier;it weakened the peak strength of the chevron braces and the overall braced frames;and those effects were greater fo... |
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| Keywords: | chevron-braced frame seismic behaviour dual structural system pushover analysis gravity loads |
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