BRB与结构刚度比对不规则结构抗震的影响分析  

Influence of Stiffness Ratio of BRB to Structure on Seismic Resistance of Irregular Structures

作　　者：王颖 陈克伟 潘福婷[1] WANG Ying;CHEN Ke-wei;PAN Fu-ting(Key Laboratory of Building Structure of Anhui Higher Education Institutes,Anhui Xinhua University,Hefei,Anhui 230088,China)

机构地区：[1]建筑结构安徽省普通高校重点实验室(安徽新华学院),安徽合肥230088

出　　处：《河北北方学院学报（自然科学版）》2020年第3期13-17,共5页Journal of Hebei North University:Natural Science Edition

基　　金：2018年国家级大学生创新训练项目(201812216047);安徽新华学院自然科学研究重点项目(2016zr004)。

摘　　要：通常纯框架结构的抗侧移刚度较小,地震作用下的抗震能力有限,特别是不规则框架结构,其扭转效应将加剧地震破坏,而传统的抗扭方法就是通过增大构件截面尺寸来提高结构的抗侧移刚度,这种方法具有较大的局限性。具备多重抗侧力体系的支撑框架结构被人们所重视,这种结构体系具备多道抗震防线,提高了结构安全储备,同时支撑也成为约束不规则结构扭转的一种有效方法。研究防屈曲支撑(BRB)与结构不同刚度比对地震作用下不规则钢框架的周期、层间位移角、底层剪力等地震响应的影响。通过对比在不同抗侧刚度比、不同BRB布置方式下不规则框架结构的多遇地震响应,分析刚度比对结构抗震性能的影响。得出BRB有效控制不规则结构抗震性能的合理刚度比,为实际工程应用提供参考。Usually the pure frame structure has less lateral displacement stiffness,and the seismic capacity under earthquake is limited.Especially as to the irregular frame structure,its torsional effect will aggravate the earthquake damage.The traditional anti-torsion method of the structure is to increase the cross-sectional size of the member to improve the lateral stiffness of the structure,but this method has greater limitations.At present,attention has been paid to the brace-frame structure with multiple anti-side force system.This structure system has multiple anti-seismic defense lines,which improves the structural safety reserve.The brace also becomes an effective method to restrain the irregular structure from twisting.This project mainly studied the influence of the different stiffness ratios of the buckling-restrained brace(BRB)to the structure on the seismic response of the irregular steel frame under the action of the earthquake,such as the period,inter-layer displacement angle and bottom layer shear force.The effects of the stiffness ratio on the seismic performance of the structure were analyzed by comparing frequent earthquake response of irregular frame structure with different lateral stiffness ratios and different BRB arrangements.The reasonable stiffness ratio of BRB to effectively control the seismic performance of irregular structures was obtained,which provides a reference for practical engineering applications.

关 键 词：防屈曲耗能支撑 不规则钢框架 扭转效应 刚度比 

分 类 号：TU352.1[建筑科学—结构工程]