基于性能的基础隔震结构地震易损性分析  

Performance-based seismic vulnerability analysis of base isolation structures

作　　者：曲激婷[1] 房文琪 QU Ji-ting;FANG Wen-qi(School of Civil Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学土木工程学院,大连116024

出　　处：《计算力学学报》2018年第5期567-573,共7页Chinese Journal of Computational Mechanics

基　　金：国家重点研发计划(2016YFC0701108);中央高校基本科研业务费(DUT17LK29)资助项目

摘　　要：对基础隔震结构进行基于性能的易损性分析。首先,建立了基础隔震结构基于拟力法的能量方程,提出基于变形和隔震层塑性耗能的损伤指标,定义隔震结构的四个损伤性能状态;然后,对隔震结构进行动力非线性分析,计算得到两种损伤指标的损伤值;最后,对损伤值进行线性统计回归分析,推导出结构发生各级破坏的概率计算公式,从而分别得到隔震结构基于两种损伤指标的易损性曲线。研究表明,基于隔震层塑性耗能的损伤指标更能合理反映该结构的损伤程度,为基于性能的隔震结构易损性分析提供了新的思路和方法。The vulnerability analysis based on the performance of base isolation structures was performed.Firstly,the motion and energy equations of base isolation structures based on force analogy method were established,and damage indices based on deformation and plastic energy dissipation of isolation layers were put forward,and four damage performance status of isolation structures were defined.Then,the nonlinear dynamic analysis of an isolation structure was carried out,and values of the two kinds of damage indices were calculated.Finally,statistical regression analysis for the damage features was performed and the probability calculation formula for every damage states of structure was derived,thus structural vulnerability curves based on two kinds of damage indices were obtained respectively.Studies have shown that the damage index based on plastic energy dissipation of isolation layers could be a more reasonable indication of the damage severity.A new idea and method for vulnerability analysis of isolation structures based on performance is provided.

关 键 词：基础隔震结构 易损性分析 拟力法 动力非线性分析 隔震层塑性耗能 

分 类 号：TU352.12[建筑科学—结构工程] O322[理学—一般力学与力学基础]