RC框架结构地震倒塌易损性分析的实用方法

基于增量动力分析(IDA)的倒塌易损性分析方法是评估建筑结构抗地震倒塌能力的精细方法,但分析过程比较繁杂且非常费时。为了较快地评估建筑结构的抗地震倒塌能力,首先利用静力非线性(pushover)分析,获得结构倒塌能力的初步估计值aS*,然后将每个地面运动记录调整到aS*,对结构进行动力时程分析,记录结构的动力时程反应,利用IDA的思想得到结构的中值数倒塌谱强度?CTS。该方法与传统的增量动力分析方法相比较,可提高计算效率,计算精度也满足要求。

The Practical Method of Collapse Fragility Analysis of RC Frame Structure

Collapse fragility analysis method based on the incremental dynamic analysis (IDA) is a fine algorithm of estimating structural resistance to earthquake-induced collapse. However, the analysis process is complicated and very time-consuming. In order to assess earthquake-induced collapse of structural resistance ability quickly, we suggest firstly utilizing nonlinear static (pushover) analysis to obtain an initial estimate( ) of collapse resistance, then adjust each intensity of ground motions records to , perform the dynamic time-history analysis and record the dynamic time-history response of the structure to receive the average spectrum intensity by the thinking of IDA. The proposed algorithm is more computationally efficient than a standard incremental dynamic analysis approach. The accuracy of the proposed approach also meets requirements.