非线性静力分析需求谱建立方法的两点改进

非线性静力分析是对结构在罕遇地震作用下进行弹塑性变形分析的一种方法,目前广泛应用于结构的抗震性能评估中.非线性静力分析的研究目前有若干分析方法,这些方法在结构能力曲线建立的方法上是相同的,即首先建立力-位移曲线,然后转化为承载力谱,但是在需求曲线的建立上各有不同.通过介绍几种典型的非线性静力分析需求谱建立方法,指出其和原有的需求谱建立方法的不同和改进之处.

Two Improvements on Method of Nonlinear Static Analysis Demand Spectrum

Nonlinear static analysis,as a widely used seismic perlormance assessment method,is used in elastic-plastic deformation analysis of structures under rare event of earthquake.Nonlinear static analysis has a number of current analytical methods,which are the same in the establishment of structural capacity curve,namely,transfer the force-displacement curve into a capacity spectrum,but different in the establishment of the demand curve.This paper introduces several typical nonlinear static analysis of establishing demand spectra methods,and reveals the difference and improvement between it and original method for establishing demand spectra.