成都东客站钢结构多点地震输入响应分析

目的为了计算多点输入效应对成都东客站结构地震响应的影响程度，统计多点输入下结构层间位移的变化情况，响应增大的构件数量以及此类构件的分布规律，判断考虑多点输入后结构安全性．方法通过有限元软件SAP2000建立了成都东客站模型，并对结构进行多遇地震下的多点输入和一致输入的时程分析，选择合理的视波速对行波效应的影响，采用地震作用响应比和设计响应比两种评价参数，统计分析多点输入下结构层间位移、构件应力比和构件内力等参数的变化情况，将多点地震输入响应分析与一致输入进行了比较．结果波速为250m／s时，站厅层的层间位移是一致输入情况的1．5倍，站厅层楼盖设计响应比最大值达到了2．433，超载单元比例达到了31．0％，而站台层和站厅层的柱轴力超载比例分别达到了95．3％和87．5％．结论多点输入效应对下部结构的影响远大于对上部结构的影响，考虑多点输入后的结构的层间位移满足设计要求，上部钢构件均满足强度设计要求，而下部混凝土构件，特别是混凝土柱受多点输入效应的影响较大．

Time-History Analysis of Seismic Response of Chengdu East Railway Station Subjected to Non-Uniform Ground Motions

This paper is aimed at calculating the influence of seismic response of Chengdu East Railway Sta- tion under multi-support excitations ,judging the structural security and proposing corresponding design sug- gestion. The model of Chengdu East Railway Station is established by SAP2000 to make the time-history a- nalysis under multi-support and uniform excitations. Reasonable wave velocity is selected to consider the wave-passage effect. For comparing the difference between multi-support and uniform excitation response, two assessment parameters of seismic response ratio and design response ratio are used to statistically analy- sis the changing of story drift, component stress ratio and component internal force. When wave velocity is 250 m/s ,the story drift Qf station hall under multi-support excitation is 1.5 times that under uniform excitation, the maximum of design response ratio of station hall floor reaches 2. 433 with 31% overloaded compo- nents, the column axial force overloaded of platform layer and station hall corresponding reaches 95.3 % and 87.5%. It can be seen from the result,the influence under multi-support excitations of substructure is obvi- ously larger than superstructure. Considering the multi-support effect, both story drift and superstructure steel members of this structure satisfy the design requirements, but the substructure concrete members, especially concrete column, are deeply influenced by multi-support excitations which should be paid more attention.