Pushover方法的准确性和适用性研究-LuXinzheng.PDF

第 30 卷第 1 期 工程抗震与加固改造 Vol30 ,No1 　 2008 年 2 月 Earthquake Resistant Engineering and Retrofitting Feb. 2008 　 ( ) [文章编号] 2008 Pushover 方法的准确性和适用性研究 缪志伟 ,马千里 ,叶列平 ,陆新征 (教育部工程结构与振动重点实验室 ,清华大学土木工程系 ,北京 100084) [摘 　要] 　Pushover 方法作为一种建筑结构弹塑性地震响应的简化近似计算方法和抗震性能评价方法已得到广泛应用 。但 由于其理论基础不严密 ,其准确性需要给予必要确认 , 同时其适用性也应受到一定的限制 。本文以逐步增量弹塑性时程方法 的结果为基准 ,分别以一个普通 6 层 RC 框架结构和一个 18 层 RC 框架 - 剪力墙结构为例 ,对 Pushover 方法的准确性和适用性 进行了分析研究 。结果表明 ,Pushover 方法仅适用于以第一振型为主的高度不大的结构 ,且应采用两种以上的侧力模式 ;对于 高阶振型影响较大的结构 ,该方法的准确性较差 ,承载力预测显著偏低 。 [ 关键词] 　Pushover 分析 ;框架结构 ;框架 - 剪力墙结构 ;逐步增量弹塑性时程分析 [ 中图分类号] 　TU3114 　　　[文献标识码] 　A Study on the Accuracy and Applicability of the Pushover Analysis Miao Zhiwei , Ma Qianli , Ye Lieping , Lu Xinzheng ( MOE Key Lab of Structural Engineering and Vibration , Department of Civil Engineering , Tsinghua University , Beijing 100084 , China) Abstract :The nonlinear static pushover analysis procedure is now widely used as a simple method to estimate the inelastic seismic response for building structures. However , the accuracy of the method still needs to be validated because of the inherent limitations in its theory. Besides , there are some limitations on the application of this method. In this paper , the accuracy and the applicability of the pushover analysis procedure are verified based on the incremental dynamical analysis method with a 6storey RC frame and an 18storey RC framewall structure. The comparison between the results of the two methods shows that the pushover method can be used only for lowrise building structures that their responses are controlled by the first modal. It is also shown that for the highrise building structures which are much influenced by the higher modal , pushover analysis always gives the much lower capacity results. Keywords :pu