斜拉桥一致激励和多点激励下的地震反应分析

摘要

The dynamic time-history analysis methodology is discussed.including the multiple-support seismic input problem for the three-dimensional linear earthquake-response analysis of cable-stayed bridges.And a comparative study is made between the response of the models under uniform earthquake and their response to multiple-support excitations.Analysis results show that multiple-support seismic excitations can have a significant effect and should be considered in the earthquake-response analysis of such long and complex three-dimensional structures.%讨论了斜拉桥的地震动力分析方法,包括三维斜拉桥线性地震分析的多点激励地震输入问题.对两典型跨径斜拉桥进行了一致激励和多点激励情况的比较分析.结果表明:多点激励对于长大跨径斜拉桥地震响应有很大影响,在进行地震响应分析必须予以考虑.