高强钢管混凝土柱-铝合金屈曲约束支撑结构的地震易损性分析  

Seismic Fragility Analysis of High-Strength Concrete Filled Steel Tube Column-Aluminum Alloy Buckling Restrained Braces Structure System

作　　者：李帼昌[1] 魏骊蓉 邱增美 刘旭 Guochang Li;Lirong Wei;Zengmei Qiu;Xu Liu(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China;Shenzhen Special Zone Construction Steel Structure Co.,Shenzhen 518053,China)

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110168 [2]深圳市特区建工钢构有限公司,广东深圳518053

出　　处：《钢结构（中英文）》2024年第7期1-9,共9页Steel Construction（Chinese & English）

基　　金：国家自然科学基金重点项目(51938009)。

摘　　要：为研究高强钢管混凝土柱-铝合金屈曲约束支撑结构体系(HSC-SB-ALAB)在不同强度地震动作用下的失效概率,基于增量动力分析(IDA)方法,选取近场脉冲型地震动、远场地震动、近场非脉冲型地震动和综合地震动四组共45条强震记录对一个10层HSC-SB-ALAB结构体系进行了地震易损性分析,得到了结构在4种地震类型作用下的易损性曲线,给出了结构在多遇地震、设防地震和罕遇地震时达到各个极限状态的概率,计算并评价了结构的倒塌储备系数。研究结果表明:近场脉冲型地震动作用下结构达到各极限状态的概率最大,远场地震动作用下的超越概率最小;结构在各种类型地震动的作用下,倒塌概率仅为1%左右,满足“小震不坏、中震可修、大震不倒”的抗震设防目标,倒塌储备系数均大于FEMA P695中要求的最小值2.47,是其他类型钢管混凝土结构的1.34~1.43倍。In order to study the failure probability of the high-strength CFST-aluminum alloy core assembled buckling-restrained braces(HSC-SB-ALAB)under different intensity of ground motion,based on the incremental dynamic analysis(IDA)method,the near-field pulse ground motion,far-field ground motion,near-field ground motion and integrated ground motion were selected.The seismic fragility of a 10 story HSC-SB-ALAB is analyzed by using four groups of 45 strong motion records.The fragility curves of the structure under four earthquake types are obtained;the probability of reaching each limit state of the structure under frequent earthquake,fortified earthquake and rare earthquake is given;and the collapse margin ratio of the structure is calculated and evaluated.The results show that the probability of reaching each limit state is the largest under the action of near-field impulse ground motion,and the exceeding probability is the smallest under the action of far-field earthquake.Under the action of various types of ground motions,the collapse probability of the structure is only about 1%,which meets the seismic fortification goal of"no damage in small earthquake,repairable in medium earthquake and no collapse in large earthquake".The collapse reserve coefficient is greater than the minimum value of 2.47 required in FEMA P695,which is 1.34-1.43 times that of other types of concrete-filled steel tubular structures.

关 键 词：高强材料 钢管混凝土 屈曲约束支撑 增量动力分析 易损性分析 

分 类 号：TU398.9[建筑科学—结构工程] TU312.3