三维远场长周期地震下考虑SSI层间隔震结构地震响应分析  

Seismic response analysis of inter-story isolation structures considering SSI under three-dimensional far-field long-period ground motions

作　　者：周旺旺 刘德稳 赵洁[1] 陈李昊 刘阳 万锋[1] ZHOU Wangwang;LIU Dewen;ZHAO Jie;CHEN Lihao;LIU Yang;WAN Feng(College of Civil Engineering,Southwest Forestry University,Kunming 650000,Yunnan,China;Postdoctoral Research Station,Southwest Forestry University,Kunming 650000,Yunnan,China;College of Civil Engineering,Tongji University,Shanghai 200123,China)

机构地区：[1]西南林业大学土木工程学院,云南昆明650000 [2]西南林业大学博士后流动站,云南昆明650000 [3]同济大学土木工程学院,上海200123

出　　处：《地震工程学报》2023年第2期362-371,共10页China Earthquake Engineering Journal

基　　金：国家自然科学基金(52168072,51808467);云南省教育厅科学研究基金项目(2021Y226);云南省“万人计划”高层次人才支持项目(2020)。

摘　　要：实际地震具有多维特性,只考虑水平向作用往往不够真实全面,而且远场长周期地震动不同于普通地震动,具有周期长、持时长、低频成份丰富等特征,对周期较大的隔震类结构会产生不利影响,在考虑SSI效应(soil-structure interaction,SSI)中尤为复杂,需深入探讨。基于此,建立大底盘层间隔震结构,在三维地震动激励下,探讨普通地震与远场长周期地震对层间隔震结构的不同影响,并分析考虑SSI效应对结构的不同程度影响。结果表明:三维地震下,远场长周期对层间隔震结构产生的地震响应远大于普通地震;考虑SSI效应时,随着土体变软,结构响应增大;针对传统水平隔震支座,在三维远场长周期地震下出现层间位移角和支座位移超限问题,设置三维隔震支座,解决了超限问题,分析结果表明其隔减震效果明显优于传统水平隔震支座。Earthquake excitation is a kind of complicated multi-dimensional motion,so it is not safe and accurate enough to only consider horizontal earthquake excitation.Unlike ordinary ground motions,far-field long-period ground motions have characteristics such as long period,long duration,and rich low-frequency components.They will have adverse effects on structures with large isolation periods.The soil-structure interaction(SSI)is particularly complicated and needs further discussion.Therefore,a large chassis inter-story isolation structure was established in this paper.Under the excitation of three-dimensional ground motion,the different effects of ordinary earthquakes and far-field long-period earthquakes on the inter-story isolation structure were discussed,and the different effects of SSI on the structure were analyzed.The results show that the seismic response of three-dimensional long-period far-field ground motion on the inter-story isolated structure is far greater than that of ordinary ground motion.When the SSI effect is considered,the structural response increases with increasing soil softness.Three-dimensional isolation bearings were set to solve the problems of traditional horizontal isolation bearing under three-dimensional far-field long-period ground motion,i.e.,story drift ratio and bearing displacement beyond limits.The analysis results show that the isolation effect of three-dimensional isolation bearings is better than that of traditional horizontal isolation bearings.

关 键 词：层间隔震 三维地震动 远场长周期 SSI效应 隔震支座 地震响应 

分 类 号：TU352.1[建筑科学—结构工程]