土-结构作用对任意曲面RFPS滚珠摩擦摆减震效果影响分析  

Research about SSI influence on seismic mitigation efficiency for rubber bearing isolation system

作　　者：富腾 王文卉 葛楠 王兴国 Fu Teng;Wang Wen-hui;Ge Nan;Wang Xing-guo(College of Architecture Engineering,North China University of Science and Technology,Tangshan 063009,China)

机构地区：[1]华北理工大学建筑工程学院,河北唐山063009

出　　处：《工程抗震与加固改造》2023年第1期17-23,共7页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(51378170);国家自然科学基金项目(51478162);河北省重点项目(149654061);河北省省级科技计划资助(20556104D);唐山市科技计划项目(19130229g)。

摘　　要：通过子结构的方法,建立考虑SSI(Soil Structure Interaction)下的RFPS滚珠支座隔震结构的地震动力反应计算模型来探讨SSI对RFPS减震效果的作用,通过有限元模拟软件计算。RFPS滚珠支座由上、下两个凹形圆弧曲线滑道和放置在2个滑道中间位置的滚珠组成,滚珠与滑道之间为非协调接触相当于一种滚珠摩擦摆。这种摩擦摆增加了结构的自振周期,即提供了一定的隔震能力。因此RFPS具备隔震装置必备的特征。该系统中上、下盘接触面与滚珠之间产生的摩擦力可抵消一定的地震能量,且依靠自身重力可以使其复位。在影响滚动摩擦力的所有要素里,均考虑了弹性滞后和接触面滑移的影响。计算结果表明:(1)在结构中设置RFPS可明显减小动力反应;(2)考虑SSI作用时,刚性基础的平移不大,转动角也很小,在较软弱场地可能不宜安装RFPS;在较坚硬场地设置RFPS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;楼层加速度受到基础重心高度的作用,使结构顶部产生轻微鞭梢效应。By using the substructure method,the seismic dynamic response calculation model of the RFPS considering the Soil Structure Interaction(SSI)is established to discuss the influence of SSI on the damping effect of the RFPS bearing,and the finite element simulation software is used to solve the problem.This system consists of a roller which is placed in the vicinity of two arbitrary concave curve slides.The non-coordinated contact between the ball and the slide can form a kind of ball type friction pendulum.This kind of friction pendulum prolongs the natural vibration period of the structure,it has a certain ability of isolation.Therefore,the RFPS has the necessary isolation ability of isolation system.In this system,the rolling friction forces at the contacting surface on the top and bottom plate respectively,provides the energy dissipation ability.and it can be reset by the structural gravity.Of all the factors affecting the rolling friction resistance,the micro-slip and the elastic hysteresis are taken into consideration.The results show that:(1)RFPS bearing could effectively decrease seismic response value;(2)as SSI is considered,translation displacement and swing angle of rigid might be rather small;RFPS 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;centroid depth of foundation also exerts some influence on storey acceleration,which exhibit a slight structural whipping effect.

关 键 词：土与结构相互作用 隔震结构 基础 地基土 层间位移 

分 类 号：TU241.4[建筑科学—建筑设计及理论]