高层钢结构抗震pushover分析的侧向力分布模式及其影响

Lateral action patterns and their effects on pushover seismic analysis of steel tall buildings

本文针对高层钢结构抗震Pushover分析的适用性和侧向力分布模式的选取等问题,首先,介绍和分析了Pushover分析常用的五种侧向力分布模式及其本质特征;然后,给出了判断侧向力分布模式合理性的准则;最后,通过对比一座15层的平面钢框架结构在Ⅳ类场地的典型地震动下的非线性时程分析和五种侧向力分布下的Pushover分析中的破坏形式和弹塑性反应,研究了高层钢结构抗震Pushover分析的适用性和各侧向力分布模式的合理性;在此基础上,本文给出了高层钢结构Pushover分析时侧向力分布模式的选取建议。

This paper mainly studies the applicability of pushover seismic analysis of steel tall buildings and the selection of reasonable lateral action patterns. Firstly, five usual lateral action patterns and their essential characteristics for pushover analysis are introduced and analyzed. Secondly, the criterion of the reasonable lateral action pat.terns is given. By employing a 15-story steel plane frame for nonlinear time history analysis under typical earthquake ground motion on Ⅳ soil site and pushover analysis under four lateral action patterns and comparing the structural relevant failure modes and elastic-plastic response, the applicability of pushover seismic analysis of steel tall buildings and rationality of various lateral action patterns are studied. At last the selection of the lateral action patterns is suggested for pushover seismic analysis of steel tall buildings.