落地墙厚度对框支剪力墙结构抗震性能的影响研究

高层框支剪力墙结构中,结构的抗侧刚度往往在转换层附近发生突变,易引起应力集中,对结构抗震不利。为提高结构的抗震性能,通常将部分剪力墙贯通落地,落地墙厚度的变化对结构的抗震性能有着重要影响。以某商住楼为例,计算分析不同落地剪力墙厚度时相应结构的地震反应,探讨参数变化对转换楼层附近地震剪力发生突变的影响。分析结果表明:落地墙厚度对转换层下部框支结构的等效侧向刚度影响显著,对整体抗侧刚度影响有限,剪力突变在一定程度上得到改善。

STUDY ON EFFECT OF GROUND WALL THICKNESS ON SEISMIC PERFORMANCE OF FRAME-SUPPORTED SHEAR WALL STRUCTURES

In high-rise frame-supported shear wall structure,the lateral stiffness of structure nearby transfer storey is usually changed sharply,which easily causes stress concentration and is harmful to seismic performance.In order to improve the seismic performance of structure,parts of shear wall are usually linked with ground.The ground wall thickness has an important influence on seismic performance of structure.This paper is based on the engineering example about a commercial and residential building,calculates and analyses respectively the seismic response of different structure with different thickness,and focuses on the influence of different parameters on shear mutation between frame-supported wall and ground wall near conversion layers.The analysis results show that the change of shear wall thickness have an important influence on equivalent lateral stiffness of structure under transfer storey and a limited influence on the whole lateral stiffness,shear mutation to some extent can be abated.