采用牺牲耗能支撑的钢框架-支撑结构抗震性能分析  

Supports seismic performance analysis of steel frame brace structure with sacrificial-energy dissipation

作　　者：孙志娟 陈侣宏 初明进[1] 陆新征[2] Sun Zhi-juan;Chen Lv-hong;Chu Ming-jin;Lu Xin-zheng(Beijing Advanced Innovation Center for Future Urban Design,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]北京建筑大学北京未来城市设计高精尖创新中心,北京100044 [2]清华大学土木工程系土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《工程抗震与加固改造》2023年第4期14-23,共10页Earthquake Resistant Engineering and Retrofitting

基　　金：国家重点研发计划(2019YFC1509305);国家自然科学基金(51778034);北京市自然科学基金(8222012)。

摘　　要：钢支撑是钢框架-支撑结构中重要的抗侧力构件,研发新型支撑对改进结构的抗震性能具有重要意义。本文以15层钢支撑框架结构为研究对象,采用屈曲约束支撑(BRB)和牺牲-耗能支撑(SED)对比分析结构的抗震性能。弹塑性分析结果表明,BRB始终保持着较高的屈服后强度,结构中与支撑相连的梁、柱在后期承受了附加的轴力,增加了主要结构构件耗能的比例。牺牲-耗能(SED)支撑在达到峰值荷载后,其牺牲元件退出工作,承载力得到有控制的降低,减少了相连框架柱后期所受轴力,使得主结构中的塑性铰得到了一定程度的减少,进而主动吸引更多地震能量消耗在支撑中,达到了在强震作用下更好保护主体结构的目的。Steel brace is an important lateral force resisting member in steel braced frames.The research and development of new braces is of great significance to improve its seismic performance.This work takes a 15 stories steel braced frame as the research object.Buckling restrained brace(BRB)and SED brace are used to compare the seismic performance of the structure.The results of elasticplastic analysis show that because the BRB brace always maintains high post yield strength,the beams and columns in the structure bear additional axial force,which increases the proportion of energy dissipation of main structural members.However,after sacrificial energy dissipation(SED)brace reaching the peak load,the sacrificial elements fails,the bearing capacity is controlled to reduce,and the post-axial force on connected frame columns is reduced.This mechanism results in a certain reduction of plastic hinges in the main structure,and then actively attracts more seismic energy to be dissipated in the brace,so as to protect the main structure.

关 键 词：消能减震 抗震分析 牺牲-耗能型支撑 BRB支撑 钢框架-支撑结构 

分 类 号：TU391[建筑科学—结构工程]