地震动持时对冷成型钢结构地震响应的影响  

Influence of ground motion duration on seismic responses of cold-formed steel structures

作　　者：费浩杰 王星星[1] 张健 FEI Haojie;WANG Xingxing;ZHANG Jian(School of Architecture and Civil Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]江苏科技大学土木工程与建筑学院,镇江212100

出　　处：《江苏科技大学学报（自然科学版）》2022年第5期95-101,共7页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金资助项目(51708258);江苏科技大学人才引进项目(1122931702)。

摘　　要：为了研究地震动持时对冷成型钢结构地震响应的影响,从美国太平洋地震工程研究中心(PEER)地震动数据库中选取能概括大部分地震动特性的60条地震动记录,并依据5%~95%重要持时将其划分为长、短持时两组各30条.利用OpenSees分析软件建立两种冷成型钢结构分析模型,计算结构在60条地震动作用下的地震响应,得到结构在不同加速度峰值下的最大层间位移角和抗剪墙体屈服数量,进而分析长、短持时地震动对冷成型钢结构地震响应的影响.分析结果表明:长持时对冷成型钢结构地震响应的影响更大.长持时地震动下结构在开洞率较大方向的最大层间位移角平均是短持时地震动下的6倍,在开洞率较小方向平均是短持时地震动下的2倍;抗剪墙体的屈服数量平均是短持时地震动下的2倍.加强节点连接使结构在长持时地震动作用下沿开洞率较小方向的最大层间位移角平均下降85%左右,沿开洞率较大方向平均下降30%左右;抗剪墙体屈服的数量平均下降70%左右.To study the influence of ground motion duration on seismic responses of cold-formed steel structures,60 ground motion records which could summarize most of the ground motion characteristics were selected from PEER ground motion databases,and categorized as 30 long-and 30 short-duration records according to 5%~95%significant duration.Two kinds of cold-formed steel structures analysis models were built by using OpenSees software.Seismic responses of the structures under 60 ground motions were calculated,and maximum storey drifts and the number of yield shear walls under different PGA were obtained.Furthermore,the influence of long-and short-duration ground motions on seismic responses of cold-formed steel structures was analyzed.The analysis results show that long-duration has a greater impact on seismic responses of cold-formed steel structures.Maximum storey drifts of the structures in the direction of larger opening ratio under long-duration ground motions is on average 6 times that under short-duration ground motions and in the direction of smaller opening ratio is on average 2 times that under short-duration ground motions;the number of yield shear walls under long-duration ground motions is on average 2 times that under short-duration ground motions.Strengthening joint connections can reduce maximum storey drifts of the structures under long-duration ground motions in the direction of smaller opening ratio by an average of about 85%and in the direction of larger opening ratio by an average of about 30%;the number of yield shear walls has also dropped by about 70%on average.

关 键 词：地震动持时 冷成型钢结构 地震响应 最大层间位移角 抗剪墙体屈服数量 

分 类 号：TU391[建筑科学—结构工程]