基于性能的平面不规则结构地震易损性分析

摘要

A performance-based method to calculate fragility functions of plane irregular RC frame-shear-wall structures was proposed.Using the method of performance-based static elastoplastic pushover analysis,according to definition of the ultimate damage states of the structure,four performance level limits of threshold values of inter-story drift angles and inter-story torsion angle were proposed.Structural seismic response was obtained through nonlinear dynamic time history analysis.Concerning conception of the probability of exceedance,the analytical solutions were proposed with performance level limits.Combined with the peak ground acceleration and the probability of exceedance,the performance-based seismic fragility analysis was carried out using this method,and fragility curves were derived to assess and compare the seismic performances of the structure.The results show that torsion response should be considered for analyzing irregular RC frame-shear-wall structures.%针对平面不规则框剪结构,提出基于性能的结构整体地震易损性分析方法.基于性能分析静力弹塑性,根据结构极限损伤状态定义平面不规则框剪结构层间位移角和层间扭转角的4个性能水平限值.通过弹塑性动力时程分析获得结构地震响应.根据超越概率的定义,分别计算层间位移角和层间扭转角极限状态下超越概率.结合地震峰值加速度及超越概率对一平面不规则框剪结构进行基于性能的地震易损性分析,绘制结构的易损性曲线,比较2个指标的易损性曲线,评估结构的抗震性能.研究结果表明:对平面不规则结构进行易损性分析时,应考虑扭转响应对结构的影响,防止高估这类结构的抗震性能.