考虑SSSI效应的城市区域建筑群地震响应分析

Seismic response analysis of urban building clusters on a regional scale considering structure-soil-structure interaction

城市区域尺度上建筑群的地震响应分析对城市震后灾害的损失估计具有重要意义。对于建筑密集的城市区域,结构-土-结构相互作用(structure-soil-structure interaction,SSSI)在以往分析中常被忽略,然而,最近的研究发现,SSSI效应在包含大量高层建筑的区域动力分析中不可忽略。因此,本文提出了一种考虑SSSI效应的城市区域建筑群地震反应分析的简化方法,并以四川大学望江校区的建筑物为例进行了研究。结果表明,SSSI效应可以降低一部分建筑物的地震响应,但也有一部分建筑物遭受更严重的破坏,这与输入的地震动特性、场地条件和建筑物特性有关。

Seismic response analysis of buildings on a city scale is important for loss estimation and disaster mitigation in cities.However,the structure-soil-structure interaction(SSSI)effect due to densely packed buildings is often neglected in most analyses.Yet,recent studies have shown that SSSI effects cannot be neglected,especially for site-city interaction analyses consisting of a large number of tall buildings.Therefore,this work proposed a simplified method for seismic response analysis of buildings on a regional scale considering SSSI effects.Then the Sichuan University campus in Chengdu is used as a case study.The results show that SSSI effects reduce the seismic response of most buildings,while some buildings suffer more severe damage,depending on the input seismic ground motions,site characteristics,and building configurations.