考虑SSI和填充墙刚度效应的RC框架结构抗震性能研究  

Seismic Performance of RC Frames Considering SSI Effect and Stiffness of Infill Wall

作　　者：王海东[1] 刘举 WANG Haidong;LIU Ju(College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2019年第3期41-49,共9页Journal of Hunan University:Natural Sciences

基　　金：新世纪优秀人才支持计划资助项目(NCET-13-0190)~~

摘　　要：以满足现行设计规范要求的某一10层填充墙竖向布置不规则的钢筋混凝土框架结构为研究对象,运用SAP2000模拟计算不同场地条件下该结构在地震作用下的响应规律.分别对在刚性地基假定上不考虑填充墙的刚度效应、在土-结构相互作用(SSI)基础上不考虑填充墙的刚度效应、在刚性地基假定上考虑填充墙的刚度效应以及同时考虑SSI和填充墙的刚度效应4种不同情况进行动力时程分析,对比研究该结构的抗震性能.对比结果表明:1)在大震作用下,在SSI效应的基础上考虑填充墙的刚度效应会使SSI效应更加显著,对RC框架结构的层间位移角响应存在不利影响,采用刚性地基假定、忽略填充墙的刚度效应对结构是偏于不安全的.2)对结构进行倒塌分析,在SSI效应基础上考虑填充墙的刚度效应使结构的塑性变形向楼层底层集中更加明显,结构倒塌的峰值明显降低,且随着场地土变软,结构的倒塌峰值越低.因此,建议设计人员在该类钢筋混凝土框架结构的设计中增加底层柱的延性确保结构在地震作用下的变形需求.In this paper, a 10-story RC frame structure satisfying the current design codes was taken as a study example, and the structural response regulation under different site condition subjected to earthquake actions was simulated and calculated by SAP2000. Four kinds of cases namely considering the rigid foundation assumption without the influence of stiffness effects of the infill walls, soil-structure interaction without the influence of the stiffness effects of the infill walls, rigid foundation assumption together with the influence of the stiffness effects of the infill walls, and soil-structure interaction together with the influence of the stiffness effects of the infill walls, were examined in the dynamic time history analysis, respectively, and the seismic performance of this structure was studied comparatively. The comparison of the results showed that:(1)For the RC frame structure under rare earthquakes,considering the SSI effect with the stiffness of infill walls has negative influence on the structural response of the inter layer drift ratio. The structure with the rigid foundation assumption is not safe when the stiffness effect of the infill walls is not considered.(2)For structural collapse analysis, considering the stiffness effect of the infill walls with the SSI effect obviously generates the structural plastic deformation concentrated on the bottom story and decreases the peak values of the collapsed structure. The softer site soil results in the lower peak values of the collapse. It is suggested that designers should increase the ductility of columns to ensure the deformation demands under seismic action.

关 键 词：土-结构相互作用 填充墙 RC 框架结构 

分 类 号：TU375.4[建筑科学—结构工程] P315.92[天文地球—地震学]