考虑近场地震竖向效应的改进Pushover分析方法

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (20) : 143-149.

论文

尹犟1，周先雁1，易伟建2，陈伯望1，段绍伟1

作者信息 +

Improved Push-over analysis method with consideration of the vertical effect of near-fault earthquake

YIN Jiang1，ZHOU Xian-yan1，YI Wei-jian2，CHEN Bo-wang1，DUAN Shao-wei1

Author information +

文章历史 +

摘要

基于结构动力学理论推导两种考虑近场地震竖向效应的改进Pushover分析方法。按合理方式在结构的每个集中质量处施加竖向地震力，并据结构屈服后动力特性对其水平加载模式及形状向量进行修正。采用两种改进Pushover分析方法及两种传统Pushover分析方法，估计近场条件下两个框架结构顶点位移、楼层位移及层间位移。以算例结构在30组近场地震记录作用下的时程分析统计结果为基准,评估4种Pushover分析方法估计精度。结果表明，改进方法Ⅱ的精度最高，对算例框架最大顶点位移、最大楼层位移及最大层间位移估计结果均较准确，可用于近场条件下规则结构的地震反应分析及地震损伤评估。

Abstract

Based on theory of structural dynamics, two kinds of improved push-over analysis (POA) procedure are deduced to consider the vertical effect of near-fault earthquake. In improved methods, the vertical seismic force is loaded on every lumped mass before structural push-over analysis, and the lateral load distributions as well as the shape vector are modified according to the dynamical features of the structure after yielding. Applying two improved and two traditional POA procedures respectively, two frame structures on near-fault site, as numerical examples, are investigated for their important seismic response, such as the roof displacement, the floor displacement and the inter-story drift. According to the statistical results of structural dynamic time-history analysis based on 30 sets of near-fault ground motion records, the seismic response parameters estimated by different POA methods are testified for their precision. The results show that the modified methodⅡ possesses much higher precision compared with other methods, this method can simultaneously estimate the maximum roof-displacement, maximum floor-displacement and maximum inter-story drift of frame with high accuracy，hence can be applied to the seismic response analysis and seismic damage assessment of regular structures on the near-fault site.

导出引用

尹犟1，周先雁1，易伟建2，陈伯望1，段绍伟1. 考虑近场地震竖向效应的改进Pushover分析方法[J]. 振动与冲击, 2015, 34(20): 143-149

YIN Jiang1，ZHOU Xian-yan1，YI Wei-jian2，CHEN Bo-wang1，DUAN Shao-wei1 . Improved Push-over analysis method with consideration of the vertical effect of near-fault earthquake[J]. Journal of Vibration and Shock, 2015, 34(20): 143-149

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