摘要
为探讨FPS支座中考虑SSI(Soil Structure Interaction)对其减震效果所带来的影响,采用子结构方法,建立了FPS支座隔震结构考虑SSI的地震动力反应计算模型,并通过Matlab求解。结果表明(1)设计结构时可通过设置FPS使其动力反应大幅减小。当滑道接触面摩擦系数较大时,可能会对层间位移没有减震效果,(2)考虑SSI作用时,刚性基础的平移及摆动角度很小。在较软弱场地可能不宜采用FPS支座。在较坚硬场地设置FPS隔震支座时,只有对较小的摩擦系数(0.05),不考虑SSI的结果才是偏于安全的。(3)选择滑道半径时,应考虑减震效果及体系复位两方面的需求。楼层的加速度会受结构基础重心高度的影响,使其顶部出现轻微的鞭梢效应。
In order to investigate SSI influence upon seismic mitigation efficiency for FPS isolation bearings, a numerical model is presented for a base isolation structure, including soil structure interaction(SSI), with substructure method in soil dynamics. The solution software also prepared with Matlab language. The results show that:(1)FPS bearing could effectively decrease seismic response value, but a relatively large friction coefficient on slide surface might exhibit non mitigation efficiency for structural inter-story displacement;(2) As SSI is considered, translation displacement and swing angle of rigid might be rather small. FPS bearings might be inappropriate on soft ground site, while on hard ground site, the security of its seismic mitigation efficiency is ensured only for rather small friction coefficient(0.05);(3)slide radius should meet demand for structural system restore and seismic mitigation efficiency, and centroid depth of foundation also exerts some influence on storey acceleration, which exhibit a slight structural whipping effect.
作者
富腾
韩流涛
葛楠
王兴国
Fu Teng;Han Liu-tao;Ge Nan;Wang Xing-guo(College of Architecture Engineering,North China University of Science and Technology,Tangshan 063009,China)
出处
《工程抗震与加固改造》
北大核心
2022年第2期121-129,104,共10页
Earthquake Resistant Engineering and Retrofitting
关键词
土与结构相互作用
隔震结构
基础
地基土
层间位移
soil structure interaction
seismic isolation structure
foundation
foundation soil
inter-storey displacement
