层间隔震结构摩擦摆控制系统参数影响分析  

Analysis of parameter influence on friction pendulum control system of interstory isolation structure

作　　者：段存坤 张春巍[1,2] DUAN Cunkun;ZHANG Chunwei(College of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Multidisciplinary Center for Infrastructure Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]沈阳工业大学多学科基础设施工程研究中心,辽宁沈阳110870

出　　处：《自然灾害学报》2022年第5期90-103,共14页Journal of Natural Disasters

基　　金：国家重点研发计划项目(2019YFE0112400)。

摘　　要：文中研究了基于摩擦摆支座的结构层间隔震控制问题,分别建立了摩擦摆支座及层间隔震结构的有限元模型,对基于摩擦摆支座的结构层间隔震控制系统进行了参数影响分析以掌握其规律。以摩擦摆支座的摩擦系数和滑道半径为变量,研究了该控制系统参数对结构顶层加速度和隔震层变形的影响,探讨了隔震层位置的影响规律。以结构控制第三阶段Benchmark模型为背景,建立并制作了结构和隔震支座的有限元模型和实验模型。有限元分析结果表明,增大摩擦系数改变了摩擦摆支座初始刚度,顶层加速度衰减率随着摩擦系数的增大而增大,摩擦摆支座上下板之间相对位移随之减小,隔震层变形得到有效控制;滑道半径的增加降低了摩擦摆支座的摆动刚度,顶层加速度衰减率随着滑道半径的增大而增大,摩擦摆支座相对位移也随之增大;隔震层位置的变化影响结构整体动力特性,体现在振型模态参与质量系数的比例发生变化,摩擦摆层间隔震控制通过调整每个振型的贡献率来降低高阶振型的影响。In this paper,the control problem of inter-story isolation based on friction pendulum system(FPS)is studied,and the finite element models of FPS and inter-story isolation structure are established respectively.The influence of parameters on the control system of inter-story isolation based on FPS is analyzed to grasp its laws.Taking friction coefficient and slideway radius of FPS as variables,the influence of the parameters of the control system on the acceleration and deformation of isolation layer on the top of the structure is studied,and the influence law of isolation floor position is discussed.Based on the third stage 9-layer benchmark model,the finite element model and experimental model of the structure and isolation bearing are established and manufactured.The finite element analysis results show that increasing the friction coefficient changes the initial stiffness of the FPS,the top acceleration attenuation rate increases with the increase of the friction coefficient,and the FPS displacement decreases.The deformation of the isolation layer is effectively controlled.The increase of the slideway radius reduces the restoring stiffness of the FPS;the attenuation rate of the top acceleration increases with the increase of the slideway radius,and the FPS displacement increases.The change of the position of the isolation layer affects the overall dynamic characteristics of the structure,which is reflected in the change of the proportion of the mode participation mass coefficient.The FPS inter-story isolation technology reduces the influence of the high-order mode by adjusting the contribution rate of each mode.

关 键 词：摩擦摆支座 摩擦系数 初始刚度 摆动刚度 层间隔震控制 

分 类 号：TU355[建筑科学—结构工程]