双向地震激励下隔震结构抗倾覆特性的数值分析  

Numerical analysis on overturning resistant property of seismic isolated building subject to bi-directional earthquake excitation

作　　者：杜永峰[1,2] 李慧[2] 

机构地区：[1]兰州理工大学防震减灾研究所,兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州730050

出　　处：《计算机辅助工程》2011年第1期42-46,共5页Computer Aided Engineering

基　　金：国家自然科学基金(50978130);甘肃省研究生导师基金(0903-01)

摘　　要：为研究叠层橡胶支座隔震建筑的抗倾覆性能,建立隔震结构在双向地震激励下倾覆力矩时域响应动力分析模型.在对该模型进行简化的基础上,利用结构设计反应谱探讨结构高宽比和结构基本周期等因素对隔震结构抗倾覆力矩与倾覆力矩比值的影响.给出多层和小高层隔震结构在双向地震作用下的抗倾覆安全因数随地震烈度、场地土类别的变化规律.利用本课题组承担设计的实际隔震工程,对"5.12"汶川地震陇南地震波的倾覆力矩响应进行数值分析.结果表明结构高宽比对隔震结构的抗倾覆性能的影响比结构基本周期更大,竖向振动产生的附加应力对隔震建筑抗倾覆性能总是不利的,并且设置隔震结构高宽比限值时应考虑工程所在地的设防烈度和场地土类别.To study the overturning resistant property of seismic isolated building with laminated rubber bearing,the dynamic analysis model for time domain response of overturning moment is established which is subjected to bi-directional earthquake excitation.Based on a simplified model,the effect of the factors including height-to-width ratio and the fundamental period of isolated building on the ratio of anti-overturning moment to overturning moment is analyzed by using structure design response spectrum.The effect of seismic intensity and site soil type on anti-overturning safety factor of seismic isolated multi-story buildings and small high-rise buildings is analyzed under bi-directional earthquake excitation.Taken the seismic wave of Longnan from＂5.12＂Wenchuan earthquake as input signal,the overturning moment responses of several real isolated buildings are analyzed.The numerical analysis result indicates that height-to-width ratio has stronger effect on the anti-overturning property than the fundamental period,andvertical earthquake excitation always has negative effect on the anti-overturning property of isolated structures.The seismic fortification intensity and the site soil type should be considered to determine the limit value of height-to-width ratio.

关 键 词：结构减震控制 隔震 倾覆力矩 高宽比限值 竖向地震动 

分 类 号：TU352.12[建筑科学—结构工程]