考虑黏结滑移RC框架结构抗倒塌性能分析  

Collapse-resistant Performance of RC Frame Structure Addressing Bond-slip Effect

作　　者：何庆锋[1] 邓颖婷 易伟建[1] HE Qingfeng;DENG Yingting;YI Weijian(College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院

出　　处：《湖南大学学报（自然科学版）》2019年第9期1-10,共10页Journal of Hunan University:Natural Sciences

基　　金：国家重点专项资助项目（2016YFC0701400）;国家自然科学基金资助项目（51108170）;中央高校基本科研业务专项资金资助项目（2012-16）~~

摘　　要：钢筋混凝土框架梁在倒塌过程中会经历大变形受力阶段,为研究钢筋黏结滑移效应对其抗倒塌性能的影响,特别是悬索阶段的受力特性,基于OpenSees非线性有限元分析平台以及一组钢筋黏结滑移模型参数,采用梁柱节点单元对约束梁子结构试验进行了数值验证,计算结果有效反映了结构的弹性与塑性变形、压拱效应以及悬索阶段的受力特性,且与试验结果吻合良好.基于计算结果,对一榀单层和一榀三层平面框架结构的试验结果进行了数值模拟,并分析了层数和跨数对平面框架结构抗倒塌性能的影响以及倒塌受力机理.Reinforced concrete(RC) frame beams will undergo large deformation stages in the process of collapse. In order to study the influence of bond-slip effect of reinforcing bars on the progressive collapse resistance of RC frame beams,especially in the suspension stage,the beam-column joint element was used to numerically validate the experimental results of a restrained beam substructure on the basis of OpenSees nonlinear finite element analysis platform and a set of parameters in the bond-slip model of reinforcing bars. The analysis results effectively reflect the elastic and plastic deformation,arch-compression effect and mechanical characteristics of the suspension stage of the structure,which are in good agreement with the experimental results. On the basis of the above analysis results,further simulations were conducted in a single-story plane RC frame structure and a three-story plane RC frame structure. In addition,the effects of number of stories and spans on the collapse-resistant performance of the plane frame structure were investigated. The force mechanism was also analyzed.

关 键 词：梁柱节点单元 黏结滑移 抗倒塌性能 梁柱子结构 钢筋混凝土框架 数值模拟 

分 类 号：TU311.41[建筑科学—结构工程]