中文摘要：

如何选取合适的地震动仍是时程分析的一大难题。考虑结构弹塑性周期延长的特点，提出了主要周期点附近1．5倍谱面积选波法；分别按主要周期点规范选波法（简称周期点法）、主要周期点附近谱面积选波法（简称面积法）和主要周期点附近1．5倍谱面积选波法（简称1．5T 面积法）选取地震动，对建立的两个 ETABS 结构模型进行了多遇地震和罕遇地震下的时程分析；对比了三种选波法的特点，提出了各自的适用范围。

英文摘要：

How to choose the most suitable records as earthquake inputs to the design structure is a great con-cern in the application of time-history analysis.This paper considers the characteristics of structural elasto-plastic extending period and proposes the method based on the 1.5 times of spectrum area near the main period point.“Period-point method”which controls the deviation of the spectral values at main period points to the design response spectrum is recognized in the method specified in design codes.This paper studies and propo-ses “Area method”and “1.5 T Area method”,compared with “Period-point method”.Through ETABS to establish two trial models,a velocity sensitive section,another in the displacement sensitive section.Then the elastic dynamic analysis under frequently occurred earthquake and the dynamic analysis under rarely occurred earthquake are carried out.This paper contrasts the characteristics of the three methods and proposes their limits.