地震动选取方法对超高层结构抗震性能的影响

The effect of ground-motion selections on seismic performance of a super-tall structure

我国时程分析中地震动的选取常用两种方法:规范法和最不利地震动法。为了研究不同方法对超高层结构抗震性能的影响,以某超高层结构为例,采用这两种方法分别选择地震动,用ABAQUS软件对结构进行了罕遇地震下的弹塑性时程分析,将计算得到的结构反应进行了对比分析。结果表明:最不利地震动法中台湾组地震动的结构反应最大,国外组次之,大陆组最小;台湾组和国外组地震动的结构反应比规范法地震动大很多,而大陆组的结果刚好相反。

In China, there are two main methods of choosing proper ground motion records for the time history anal- ysis： the method specified in design codes and the most unfavorable ground motion method. To investigate the influ- ence of the two earthquake ground-motion selection methods on the seismic performance of super-tall structures, a case of a super-tall structure is studied. The earthquake ground motions are first chosen for the structure in the two selection methods respectively, and then the elasto-plastic dynamic analysis under major earthquakes is carried out by ABAQUS program. Finally, the numerical results of the structure responses are compared. The results indicate that the responses caused by the most unfavorable ground motions in Taiwan （China） group is the largest, the for- eign group takes the second place, and the China mainland group is the least. The responses caused by the ground motions in Taiwan （China） and foreign group are much greater than that of the design codes＇ method, while the contrary result is obtained in the China mainland group.