基于IDA方法的框架结构震害风险评估

Seismic Risk Assessment of Frame Structures Based on IDA Method

为了评估不同抗震设防烈度区建筑结构震害风险,即场地地震危险性与结构地震易损性的卷积,本文以典型框架结构为例,对其震害风险进行研究。依据抗震设计规范,分别按照6度、7度和8度设计3个3跨10层框架结构模型,采用动力增量分析方法(Incremental Dynamic Analysis,IDA)对其进行地震易损性分析。同时,基于我国地震烈度概率分布特点,应用MATLAB软件生成符合极值Ⅲ型分布的地震烈度,并将其转化为地震加速度峰值,联合地震易损性结果评估模型震害风险。通过划分震害风险等级,为建筑结构抗震防灾对策的制定提供借鉴。

In order to evaluate the seismic risk of buildings in different seismic fortification intensities,that is,the convolution of site seismic hazard and structural seismic fragility,a typical frame structure was taken as an example in this paper.According to the aseismic design code,three three-span ten-story frame structure models were designed with seismic precautionary intensities of 6,7,and 8 respectively.Their seismic fragility was analyzed by Incremental Dynamic Analysis(IDA).Based on the probability distribution of seismic intensities in China,seismic intensities of the extreme valueⅢdistribution were generated by MATLAB software and were converted into peak ground acceleration.Combined with the seismic fragility results,the seismic risk of three models were evaluated and the seismic risk grades were divided.It provides reference for the formulation of building seismic resistance and hazardous prevention countermeasures.