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强震作用下钢框架结构的残余侧移研究

DOI: 10.13197/j.eeev.2015.01.126.zhangq.015, PP. 126-134

Keywords: 钢框架结构,残余侧移,推覆分析,弹塑性时程分析,峰值侧移

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Abstract:

根据现行规范设计的钢框架结构在强震作用下会产生较大的不可恢复的塑性变形,震后残余变形过大的结构往往无法修复到正常使用状态,最终只能被拆除,造成了严重的直接以及间接经济损失,因而准确分析结构的残余变形对于震后结构性能的评估与控制具有重要意义。为了研究钢框架结构在强震作用下的残余侧移,本文根据现行抗震设计规范和钢结构设计规范设计了2至10层的5个钢框架结构,分别采用静力非线性和动力时程分析方法对所设计结构进行了数值分析,得到了结构在中震和大震作用下的峰值侧移、残余侧移和侧移集中系数。结果表明,所得的残余侧移具有较大的离散性。基于分析结果,提出了预测钢框架结构残余侧移的计算公式,该公式为峰值侧移、弹性侧移以及侧移集中系数的函数。

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