结合构件地震效应分项系数和逆向求解的RC框架倒塌分析  

RC frame collapse analysis using partial coefficients of components underseismic effects and an inverse solution strategy

作　　者：方圣恩[1,2] 张立森 FANG Shengen;ZHANG Lisen(School of Civil Engineering,Fuzhou University,Fuzhou 350108,China;National&Local Joint Engineering Research Center for Seismic and Disaster Informatization of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福州大学土木工程防震减灾信息化国家地方联合工程研究中心,福建福州350108

出　　处：《自然灾害学报》2020年第6期139-146,共8页Journal of Natural Disasters

基　　金：国家自然科学基金项目(51578158);福州大学“旗山学者”奖励支持计划(XRC-1688)。

摘　　要：为简化水平地震作用下多层RC框架结构的倒塌分析流程,增强实用性,结合底部剪力法提出了一种构件地震效应分项系数,用于体现地震作用对框架各构件的影响。接着以地震峰值加速度表征地震动强度,以底层柱的破坏来定义框架倒塌的界限,建立分项系数与峰值加速度间的函数关系。随后采用逆向求解策略,基于框架倒塌临界状态求得峰值加速度的临界值,进而构建单维和二维地震作用下框架的倒塌判别式,实现框架结构的地震倒塌分析。To simplify the collapse analysis of multi-story RC frame structures under horizontal seismic effects,a partial coefficient is firstly proposed using the equivalent base shear method to embody seismic effects on frame components.The strength of ground motion is represented by peak ground accelerations(PGA),and the critical boundaries of frame collapse are defined on the failure of bottom columns.Then the relationship between the partial coefficient and PGAs is formulized according to the critical boundaries.After that,an inverse solution strategy is developed to seek for the critical PGA corresponding to the collapse of a frame.Lastly,collapse discriminants are derived for frames under one or two dimensional seismic effects,and can be used for RC frame collapse analysis.

关 键 词：RC框架结构 构件地震效应分项系数 逆向求解策略 倒塌判别式 底部剪力法 

分 类 号：TU31[建筑科学—结构工程] TU375.4