增量动力弹塑性分析方法的改进及其应用  

Improved method for incremental dynamic analysis and its application

作　　者：汪梦甫[1] 汪帜辉[1] 刘飞飞[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《地震工程与工程振动》2012年第1期30-35,共6页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(50978091)

摘　　要：本文主要对增量动力弹塑性分析(IDA)方法的两个方面作了改进:(1)以增量动力弹塑性分析方法的基本原理为基础,以快速非线性时程分析(FNA)方法为计算工具,形成快速增量动力弹塑性分析(FIDA)方法。(2)仅以IDA分析结果为基础,建立地震易损性曲线及地震破坏概率计算的离散型式。为了校验本文方法的可行性与有效性,应用增量动力弹塑性分析、模态增量动力弹塑性分析与快速增量动力弹塑性分析计算一个14层筒中筒结构试验模型,比较了用上述三种方法的计算误差与计算效率,比较了传统方法与本文方法计算该模型结构的地震易损性曲线的差别。This paper describes the improvement of two key links of existing methods for Incremental Dynamic Analysis（IDA）.Firstly,an efficient method named Fast Incremental Dynamic Analysis（FIDA） is developed and evaluated.Secondly,based on the IDA results,a numerical calculation method of seismic fragility curves is developed by statistical estimation method.This calculation method can reduce the uncertainty of seismic fragility curves caused by the traditional calculation method of seismic fragility curves.Finally,a 14-story RC tube in tube structure is specified as the example model to verify the improved method.The IDA calculation of the example structure using FIDA,MIDA and IDA method,and the seismic fragility curves of the example structure using the proposed method are finished.Comparison among the results reveal that the FIDA is an efficient seismic performance evaluation method,and the proposed method for computing the seismic fragility curves is more reliable than the traditional method.

关 键 词：增量动力弹塑性分析方法 快速非线性时程分析 快速增量动力弹塑性分析方法 地震易损性曲线 筒中筒结构 

分 类 号：P315.95[天文地球—地震学] TU352.1[天文地球—固体地球物理学]