考虑支撑断裂的屈曲约束支撑-钢筋混凝土框架抗震性能分析  

SEISMIC PERFORMANCE ANALYSIS OF BUCKLING-RESTRAINED BRACED REINFORCED CONCRETE FRAMES CONSIDERING BRACE FRACTURE

作　　者：陈辉明 白久林 赵俊贤[3] 周云[4] CHEN Hui-ming;BAI Jiu-lin;ZHAO Jun-xian;ZHOU Yun(Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University),Chongqing 400045,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou,Guangdong 510641,China;School of Civil Engineering,Guangzhou University,Guangzhou,Guangdong 510006,China)

机构地区：[1]山地城镇建设与新技术教育部重点实验室(重庆大学),重庆400045 [2]重庆大学土木工程学院,重庆400045 [3]华南理工大学土木与交通学院,广东广州510641 [4]广州大学土木工程学院,广东广州510006

出　　处：《工程力学》2025年第5期197-206,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(51978109,52278482)。

摘　　要：屈曲约束支撑(Buckling-Restrained Brace, BRB)作为一种高性能金属阻尼器,在耗散地震能量的同时,内芯单元也因较大的塑性变形而产生疲劳损伤,导致BRB在强震作用下存在断裂失效的风险。该文重点探究BRB断裂行为对结构抗震性能的影响,揭示了BRB的损伤失效机理,并提出了BRB疲劳损伤的量化方法。对4个BRB-框架模型进行推覆分析和非线性时程分析,结果表明:BRB发生断裂后,结构的承载力、刚度和耗能能力大幅降低,层间位移角和残余变形响应显著增大。基于增量动力分析方法开展了结构抗震易损性分析,结果表明:不考虑BRB的断裂失效行为会高估结构的抗倒塌能力和震后可修复性。建议对结构进行抗震设计与性能评估时考虑BRB的断裂行为,以更准确地量化结构的抗震性能。As a kind of high-performance metal damper,buckling-restrained braces(BRBs)dissipate seismic energy while the inner core also suffers fatigue damage induced by significant plastic deformations,which leads to the risk of brace fracture under strong earthquakes.This study mainly investigates the effects of BRB fracture behavior on the structural seismic performance.The BRB fatigue failure mechanism is revealed and the damage quantification approach is proposed.The results of the pushover analysis and non-linear time history analysis of four BRB-frame models show that the structural load-carrying capacity,stiffness,and energy-dissipating capacity are substantially reduced after BRBs fracture,while the inter-story drift ratio and residual deformations are significantly increased.The incremental dynamic analysis method is employed to conduct the seismic fragility analysis of structures.The results show that the structural collapse probability and post-earthquake repairability will be overestimated without considering the BRB fatigue failure behavior.It is suggested that BRB fracture behavior should be taken into account in the structural seismic analysis to quantify the seismic performance of structures more accurately.

关 键 词：钢筋混凝土框架 屈曲约束支撑 疲劳损伤 抗震性能 增量动力分析 

分 类 号：TU375[建筑科学—结构工程]