考虑填充墙平面刚度分布的RC框架结构抗地震倒塌能力研究  

Study on the seismic collapse resistance of RC frame structure considering infill wall plane stiffness distribution

作　　者：祝岳 杨伟松[1] 张纪刚[1] 王向英 ZHU Yue;YANG Weisong;ZHANG Jigang;WANG Xiangying(School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266525

出　　处：《青岛理工大学学报》2024年第1期10-18,35,共10页Journal of Qingdao University of Technology

基　　金：山东省自然科学基金资助项目(ZR2022ME029,ZR2020ME246)。

摘　　要：为研究填充墙对RC框架结构抗震性能的影响,以汶川地震中发生倒塌的漩口中学教学楼A为原型,基于ABAQUS软件建立了有限元模型,对结构底层各柱的剪力进行分析,发现由于填充墙的布置使得结构平面刚度分布不均,造成地震剪力在各榀框架之间分布不均匀。为了定量地考虑平面各轴线刚度分布对结构抗震性能的影响,设计了4个沿轴线各榀填充墙框架不同刚度分布的结构模型,通过IDA(增量动力分析)分析对比评估4个模型的抗地震倒塌能力。结果表明:平面刚度均匀分布的结构模型倒塌概率最低,具有良好的地震韧性;当某轴线的刚度高于平面各轴线平均刚度的30%时,结构的倒塌概率大幅提高,抗倒塌安全储备不足,建议在设计中平面各轴线的刚度不应超过此限值。In order to study the influence of infill walls on the seismic performance of RC frame structure,the Teaching Building A of Xuankou Middle School which collapsed in the Wenchuan earthquake was taken as the prototype and a finite element model based on ABAQUS software was constructed for the shear analysis of each column at the ground floor.It was found that the arrangement of the infill walls made the structural plane stiffness unevenly distributed,resulting in the uneven distribution of seismic shear forces among the bays of frames.In order to quantitatively examine the influence of the stiffness distribution of each axis of the plane on the seismic performance of the structure,four structural models with different stiffness distribution of infill wall frames along each bay of the axis were designed,and the seismic collapse resistance of the four models were evaluated through IDA analysis.The results show that the structural model with uniformly distributed plane stiffness has the lowest collapse probability and good seismic toughness;when the stiffness of an axis is higher than 30%of the average stiffness of each axis of the plane,the collapse probability of the structure increases significantly and the collapse safety reserve is insufficient.It is recommended that the stiffness of each axis of the plane should not exceed the limit of 30%in the design.

关 键 词：填充墙RC框架结构 刚度效应 IDA分析 平面布置 抗地震倒塌 

分 类 号：TU375[建筑科学—结构工程]