三维隔震钢框架结构及内部非结构构件地震易损性研究  

SEISMIC FRAGILITY STUDY OF THREE-DIMENSIONAL ISOLATED STEEL FRAME STRUCTURE AND NON-STRUCTURAL COMPONENTS

作　　者：石运东 卫旺旺 丁阳[1,2] 李忠献[1,2] SHI Yun-dong;WEI Wang-wang;DING Yang;LI Zhong-xian(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety of China Ministry of Education,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]滨海土木工程结构与安全教育部重点实验室(天津大学),天津300350

出　　处：《工程力学》2024年第1期149-159,共11页Engineering Mechanics

基　　金：土木工程防灾国家重点实验室开放基金项目(SLDRCE18-03);国家自然科学基金项目(51978463,51427901)。

摘　　要：该文以三维隔震钢框架结构为研究对象,提出上部结构、隔震支座与滑移型设备、倾覆型设备、吊顶三类非结构构件的抗震性能量化指标,基于增量动力分析,从结构与非结构2个方面研究三维隔震结构地震易损性。基于研究案例,结果表明:三维隔震结构与水平隔震结构的结构易损性接近,两者在远场地震时结构易损性低于非隔震结构,但高强度近场地震作用时由于过大的支座位移则可能高于非隔震结构。如9度罕遇地震作用时,三维隔震结构与非隔震结构对应立即使用状态的超越概率分别为90%、80%。三维隔震结构中滑移型设备的易损性低于非隔震结构,略高于水平隔震结构。三维隔震结构与水平隔震结构均可有效降低倾覆型设备的倾覆概率,在PGA为0.8 g时倾覆概率仅为7%,且前者相比后者可显著降低倾覆型设备的摇摆角。非隔震结构与水平隔震结构中吊顶地震易损性均较高,而三维隔震结构可显著降低吊顶的易损性,近场8度罕遇地震作用下吊顶对应充分运行的超越概率仅为1%。Quantitative indices to evaluate the seismic performances of the superstructure,isolator and three types of non-structural components,i.e.,sliding and overturning type equipment and suspended ceilings,are proposed for a three-dimensional(3D)isolated steel frame structure.Based on incremental dynamic analysis(IDA),the seismic fragility of the 3D isolated structure is studied by considering the structural and nonstructural behaviors.Based on a case study,the results show that the fragility of the 3D isolated structure is similar to that of the horizontally isolated structure.Their fragility is lower than that of fixed-base structure under far-fault ground motions but may become higher under high-strength near-fault ground motions due to excessive isolator displacement.For example,when a 9-degree rare earthquake occurs,the exceedance probability of immediate service state of the three-dimensional isolated structure and the fixed-base structure is 90%and 80%,respectively.The fragility of the sliding type equipment in the 3D isolated structure is lower than that in the fixed-base structure,and slightly higher than that in the horizontally isolated structure.The 3D isolated structure and horizontally isolated structure can effectively reduce the overturning probability of the overturning type equipment;when the PGA is 0.8 g,the overturning probability is only 7%,and the 3D isolated structure can significantly reduce the rocking angle of overturning equipment compared with the horizontally isolated structure.The fragility of ceiling is high for the fixed-base and the horizontally isolated structures,while it is effectively mitigated in the 3D isolated structure.The exceeding probability of ceiling corresponding to full operation under a near-fault 8-degree rare earthquake is only 1%.

关 键 词：三维隔震结构 非结构构件 增量动力分析 地震易损性 抗震性能 

分 类 号：TU352.12[建筑科学—结构工程]