有无脉冲近断层地震转动分量对不同高宽比结构动力响应影响  

Analysis of the impact of rotational components from near-fault earthquakes with and without pulses on the seismic response of steel frame structures with different heightwidth ratios

作　　者：韩淼[1] 张晨阳 杜红凯[1] 刘永波 杨杰川 Han Miao;Zhang Chen-yang;Du Hong-kai;Liu Yong-bo;Yang Jie-chuan(Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学,北京100044

出　　处：《工程抗震与加固改造》2024年第5期90-97,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：国家重点研发计划项目(2019YFC1509500);北京建筑大学高精尖创新中心项目(UDC2019032424)。

摘　　要：建立3个不同高宽比的钢框架结构模型,选取有、无速度脉冲近断层地震波各5条,利用频域法合成地震动摇摆分量和扭转分量,考虑地震动平动、平动耦合摇摆、平动耦合扭转3种工况输入,对结构地震响应分析。结果表明:(1)相比地震动平动分量单独作用,平动耦合摇摆、平动耦合扭转均会使结构响应增大;有脉冲地震动作用下的增幅高于无脉冲地震动;(2)平动耦合扭转分量对于结构角柱响应的影响最大,边柱次之,中柱较小;(3)随结构高宽比增加,平动分量耦合摇摆分量的中柱响应增幅大于平动分量耦合扭转分量。Three steel frame structure models with different height-width ratios were established,and five near-fault ground motions with and without velocity pulses were selected.The rocking component and torsional component were synthesized by frequency-domain method,and the response of the structure was analyzed considering the input of translational ground motion,translational coupled rocking motion and translational coupled torsional motion.The results show that:(1)Compared with the independent action of the translational component,both the translational coupled rocking motion and translational coupled torsional motion increase the structural response;The increase rate under pulsed ground motion is higher than that without pulsed ground motion.(2)The translational coupled with torsional component has the greatest effect on the response of the corner column,followed by the side column and the middle column.(3)With the increase of the height-width ratio of the structure,the increase of the middle column response of the translational component coupled with the rocking component is greater than that of the translational component coupled with the torsional component.

关 键 词：摇摆分量 扭转分量 速度脉冲 高宽比 

分 类 号：TU311.3[建筑科学—结构工程] TU391