不规则高层隔震结构地震响应的影响分析  

Study on Seismic Responses of Irregular Isolated High-rise

作　　者：黄鑫东[1] 刘文光[1] 何文福[1] 

机构地区：[1]上海大学土木工程系,上海200072

出　　处：《工程抗震与加固改造》2010年第3期18-23,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(50878124)

摘　　要：以不规则且高宽比达6.1的三维隔震结构为分析模型,隔震层力学特性水平采用Bouc-Wen模型,竖向采用拉压不等双线性模型。根据PGA/PAV(地震加速度峰值比速度峰值),选取了10条地震波,分析了地震波频谱特性及隔震层偏心对不规则大高宽比隔震结构地震响应的影响。分析结果表明:采取隔震措施后,隔震层和结构顶层加速度均可减小69%,结构顶层扭转角减缓达67%;低频长周期地震波作用下隔震结构的地震响应较高频短周期地震波的大,结构响应大致随着PGA/PGV的增大而减小;当隔震后周期达某一程度后,隔震层偏心对上部结构影响不明显,可以适当放宽对支座布置的要求。本文分析结果对高层隔震结构设计具有一定参考价值。In this paper,the influence of spectrum characteristics of earthquake waves to the high isolated building is analyzed,whose floor plan is L-shaped,under the 10 different motions.From the results obtained by 3D nonlinear dynamic analysis,it can be found that the responses of structures under the lower frequency earthquake waves are greater than that under higher frequency earthquake waves.In general,the values of responses decrease with the incensement of PGA/PGV.Moreover,the isolators are not in tension under nominal combination.It is observed that the seismic responses of the isolated structure reduce significantly in comparison with the conventional structure＇s,Consequently,isolation technique is quite effective for asymmetry structures to reduce the reaction of earthquakes,using isolation technique to anti-seismic for irregular and high-rise structures has a great significant in actual application.

关 键 词：地震波频谱特性 隔震结构 地震响应 不规则结构 

分 类 号：TU973.31[建筑科学—结构工程]