建筑结构学报2018，Vol.39Issue(1)：35-42,8.DOI:10.14006/j.jzjgxb.2018.01.005
地震动速度脉冲对不同高宽比基础隔震结构抗震性能的影响
Effects of velocity pulse of ground motion on seismic capacity of base-isolated structures with different height-to-width ratios
摘要
Abstract
The influence of velocity pulse characteristics of near-fault ground motions on the seismic response of baseisolated structures was investigated in this paper.The analysis models of traditional seismic frame structures and corresponding base-isolated structures with different height-to-width ratios were established by using finite element software.Six ground motion records with forward directivity velocity pulse and fling step velocity pulse were selected as the seismic input at foundation of structures,and eight structures were analyzed by nonlinear dynamic time-history analysis.The comparative analysis is carried out on parameters of the structure responses such as the inter-story drifts,bearing displacement and base shear force.Under the velocity pulse-like ground motions,the inter-story drifts and the base shear of base-isolated structures gradually increase when the height-to-width ratio increases but the displacements tend to increase first and then decrease,and the displacement of isolation layer increases with the ratio of peak velocity to peak acceleration of the input ground motions.The base-isolated structures with the height-to-width ratio less than 3 have better vibration reduction capacity under velocity pulse-like ground motions.The smaller the height-to-width,the better the vibration reducing effect,and conversely,the seismic capacity of base-isolated structures is poor if the height-to-width ratio of the structure is 4.The adverse effect of velocity pulse of near-fault ground motion on the response of lower part of the base-isolated structure may even lead to collapse damage on the structure.关键词
RC框架结构/基础隔震/高宽比/速度脉冲/有限元分析/地震反应Key words
RC frame structure/base isolation/height-to-width ratio/velocity pulse/finite element analysis/seismic response分类
建筑与水利引用本文复制引用
李小军,贺秋梅,张慧颖,雷墉..地震动速度脉冲对不同高宽比基础隔震结构抗震性能的影响[J].建筑结构学报,2018,39(1):35-42,8.基金项目
国家自然科学基金青年项目(51408560),国家自然科学基金创新研究群体科学基金项目(51421005),中央级科研院所基本科研业务专项(DQJB17C06). （51408560）
