基于IDA的型钢混凝土框架的地震易损性分析  

Seismic fragility analysis of SRC structures based on IDA method

作　　者：李磊[1] 郑山锁[1] 李谦[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《广西大学学报（自然科学版）》2011年第4期535-541,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金重大研究计划(90815005);国家自然科学基金面上项目(50978218);高等学校博士学科点专项科研基金(20106120110003);陕西省教育厅专项科研项目(2010K633)

摘　　要：基于增量动力分析(IDA)方法研究了型钢混凝土框架结构在地震作用下的易损性和抗倒塌能力。设计了4个具有不同柱梁抗弯承载力之比的结构,对其进行IDA分析,获得了各模型的抗震能力曲线。进行了场地地震危险性分析,获得了场地地震危险性概率模型。根据结构抗震能力曲线,分析了结构的地震易损性,得到了结构在地震作用下各性态点的超越概率及结构抗倒塌储备系数。根据结构地震易损性曲线和场地地震危险性概率模型,计算了结构各性态点的年平均超越概率。结果表明,柱梁抗弯承载力之比对计算结果有显著影响,柱梁抗弯承载力之比越大则结构的抗倒塌储备系数越大,结构在特定地震动作用下倒塌的概率越小。The seismic fragility and collapse capacity of SRC structures were investigated based on incremental dynamic analysis（IDA） method.Four structures with different ratios of column-to-beam strength were designed and calculated to obtain the structural seismic capacity curves.The probability models for ground seismic hazard are established through ground seismic hazard analysis.The structural seismic fragility was analyzed according to the calculated structural seismic capacity curves,and the exceeding probability of different state levels,as well as collapse margin ratio（CMR） were obtained.Based on the calculated fragility curves and probability models for ground seismic hazard,the annual exceeding probability of different states is derived.The results show that the ratio of column-to-beam strength has great influence on structural seismic fragility.For a certain earthquake,CMR is increased as ratio of column-to-beam increases,i.e.,an increase in the ratio of column-to-beam strength can effectively reduce the collapse possibility of the structure.

关 键 词：框架 增量动力分析 倒塌 易损性 超越概率 

分 类 号：TU375.4[建筑科学—结构工程]