罕遇地震下高层RC框架结构双地震动强度参数易损性分析

为研究高层RC框架结构罕遇地震下的易损性，设计了一个7度区典型11层RC框架结构。采用IDA方法进行时程分析，以地震动峰值地面加速度和结构第一自振周期对应的谱加速度为地震动强度指标，最大层间位移角为结构损伤指标，分别得到了单一地震动强度和双地震动强度参数下的IDA曲线和失效概率，绘制了双地震动强度参数下易损性曲面，并对单一地震动强度和双地震动强度参数下的易损性分析结果进行了对比。结果表明:罕遇地震下，采用双地震动强度参数结构失效概率明显低于采用单一地震动强度参数结构失效概率；对高层RC框架结构，采用双地震动强度参数进行易损性分析反映的地震动信息更全面；采用双地震动强度参数得到的结构失效概率公式更能真实量化不同强度地震作用下结构的失效概率。

Vulnerability analysis of multipleground motion intensity measure rectors for high-rise RC frame structure under rare earthquake

In order to study the vulnerability of high-rise RC frame structure to rare earthquake,a typical 11 story RC frame structure in 7 degree area is designed. IDA method is used for time history analysis. The peak ground acceleration and the spectral acceleration corresponding to the first natural vibration period of the structure are taken as the index of ground motion intensity,and the maximum interlayer displacement angle is taken as the index of structural damage. The IDA curve and failure probability under single and double ground motion intensity parameters are obtained respectively,the vulnerability surface under double seismic intensity parameters is drawn,and the vulnerability analysis results under single seismic intensity and double seismic intensity parameters are compared. The results show that under rare earthquake,the failure probability of structure with multiple seismic intensity measure rectors is significantly lower than that of structure with single seismic intensity measure rectors;for high-rise RC frame structure,the seismic information reflected by vulnerability analysis with multiple seismic intensity measure rectors is more comprehensive;the formula of structural failure probability obtained by using multiple seismic intensity measure rectors can more truly quantify the failure probability of structure under the different seismic strength.