考虑高阶振型影响的改进的多模态推覆分析方法  

An Improved Multi-mode Pushover Analysis Method Considering the Effects of High Modes

作　　者：宋怀金[1] 

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《工程抗震与加固改造》2010年第2期25-30,共6页Earthquake Resistant Engineering and Retrofitting

摘　　要：将结构静力弹塑性分析与地震反应谱结合起来的Pushover方法是一种简单有效的结构抗震能力评定方法,本文简要介绍了这种方法的原理,并在多模态pushover分析方法的基础上,提出了改进的多模态pushover分析方法,用以建立钢框架结构的能力谱曲线。求解结构在性能点处的响应时,为了考虑高阶振型对结构抗震性能的影响,首次把振型质量参与系数应用到模态推覆分析结果的组合中。通过与弹塑性时程分析的比较,表明本文提出的改进的多模态推覆分析方法是可行的和准确的。Pushover method as a combination of nonlinear static analysis and seismic response spectrum is employed as a simple but effective tool for the assessment of structural seismic capacity. In this paper, a brief introduction of pushover analysis is presented. Based on multi-mode pushover analysis method, an improved multi-mode pushover analysis method is proposed, which can be used to establish the capacity spectrum curve of steel frame structures. In order to compute the response of a structure at performance point, the mass participation factor is introduced into the result combination of multi-mode pushover analysis for considering the effects of high modes for the first time. The result of comparison between improved multi-mode pushover analysis method and elastoplastic time-history analysis method indicates the improved multi-mode pushover analysis method is feasible and accurate.

关 键 词：结构抗震性能 改进的多模态pushover分析方法 质量参与系数 弹塑性时程分析 

分 类 号：TU352.11[建筑科学—结构工程]