主余震作用下屈曲约束支撑力学性能试验及其减震钢结构的易损性分析  

Mechanical performance test of buckling restrained brace and fragility analysis of energy dissipation steel structure subjected to main-aftershock earthquake

作　　者：宋军 詹伟 孙长昊 李朋亚 Song Jun;Zhan Wei;Sun Chang-hao;Li Peng-ya(Gansu Diantong Power Engineering Design Consulting Co.Ltd,Lanzhou 730046,China)

机构地区：[1]甘肃电通电力工程设计咨询有限公司,甘肃兰州730046

出　　处：《工程抗震与加固改造》2025年第2期36-46,104,共12页Earthquake Resistant Engineering and Retrofitting

基　　金：住房和城乡建设部课题(2019-K-078)。

摘　　要：为研究主余震序列作用下LYP160屈曲约束支撑的力学性能和其结构体系的损坏情况,设计加工了2根LYP160屈曲约束支撑,采用不同的加载制度进行了循环往复加载试验,并对滞回曲线、耗能性能参数等抗震性能进行了对比分析。基于增量动力分析方法,引入余震强度比例因子μ,构造110条主余震序列地震动,并利用OpenSees软件对8层LYP160屈曲约束支撑钢框架(LBRBF)和BRB构件进行了地震易损性分析,并给出了在不同余震强度下的易损性曲线和结构损坏状态概率直方图。结果表明:主余震序列作用下的LYP160屈曲约束支撑,随着位移幅值的增大,其耗能性能参数出现下降趋势;随着余震强度的增大,结构及BRB构件易损性曲线逐渐上移,结构超越各极限状态的概率越大。在主震强度1.0g下,当μ从0增加到1时,结构处于中等损坏状概率从5.1%增加到11.9%;当μ从0增加到1时,结构倒塌储备系数(CMR)下降了3%~20%,说明随着余震强度的增加,LBRBF结构更容易发生倒塌。To study the mechanical performance of LYP160 steel buckling restrained braces and the damages of there structural system under the main-aftershock earthquake sequences,two LYP160 steel buckling restrained braces were designed and processed,and cyclic reciprocal loading tests were conducted with different loading protocols,and comparative analyses of the seismic performance such as hysteresis curves and energy dissipation performance parameters were performed.Based on the incremental dynamic analysis method,the scaling factor of aftershock intensityμwas introduced to construct 110 main-aftershock earthquake sequences,and the analysis of the eight-story LYP160 steel buckling-restrained braced steel frame(LBRBF)and BRB components was carried out using software OpenSees,and the fragility curves under different aftershock intensities and the histograms of structural damage state probabilities were given.The results show that with the increase of displacement amplitude,the energy dissipation performance parameters of the LYP160 steel buckling restraint brace under the main-aftershock earthquake sequences show a decreasing trend;with the increase of aftershock intensity,the fragility curves of the structure and BRB components gradually shift upward,and the probability of the structure beyond each limit state is greater.Under the main shock intensity of 1.0g,the probability of the structure being in a moderate damage state increases from 5.1%to 11.9%asμincreases from 0 to 1;whenμincreases from 0 to 1.0,the collapse margin ratio(CMR)decreases by 3~20%,and the LBRBF structure is more likely to collapse with the increase of aftershock intensity.

关 键 词：屈曲约束支撑 力学性能 主余震序列 地震易损性分析 增量损伤 

分 类 号：TU391[建筑科学—结构工程]