磁悬浮隔震支座竖向及水平刚度数值研究  

Numerical research on vertical and horizontal stiffness of electromagnetic levitation isolation bearing

作　　者：夏昌 傅大宝 刘少克[2] 龙志强[2] 

机构地区：[1]福州市规划设计研究院,福建福州350003 [2]国防科技大学磁浮技术工程研究中心,湖南长沙410073

出　　处：《地震工程与工程振动》2015年第5期181-188,共8页Earthquake Engineering and Engineering Dynamics

基　　金：福州市科技计划项目

摘　　要：基于电磁学原理,开发一种新型隔震支座——磁悬浮隔震支座。该支座在地震发生时能够利用电磁吸力使上部结构与基础脱离接触,从而避免地震动向上部结构传递。推导电磁悬浮隔震系统运动方程,采用ANSYS建立磁悬浮隔震支座有限元模型,数值分析支座的竖向及水平刚度随线圈安匝数、悬浮间隙和水平位移的变化规律。结果表明:磁悬浮隔震系统是一种主动变刚度隔震系统,竖向及水平刚度与安匝数、悬浮间隙和水平位移存在非线性关系。此外,竖向刚度可以通过调整电流达到"零刚度"状态,从而使上部结构在竖直方向上不发生振动。This paper develops a new type of isolation bearing-： electromagnetic levitation isolation bearing （ELIB）. It has the ability to make upper structure loss connection with foundation with the aid of electromagnetic force under seismic action. The equation of motion of electromagnetic levitation isolation system is established. The finite element model of ELIB is made. A numerical study is conducted to investigate the effects of ampere turns, levitation gap and horizontal displacement on vertical and horizontal stiffness. The results show that： （1） electromagnetic levitation isolation system is an active variable-stiffness isolation system, and there exists nonlinear relationship between vertical and horizontal stiffness and ampere turns, levitation gap and horizontal displacement. （2） By real-time controlling current, the vertical stiffness could reach to ＂zero-stiffness＂ state, which indicates that the upper structure avoids vibrating in the vertical direction.

关 键 词：磁悬浮隔震支座 竖向刚度 水平刚度 有限元分析 

分 类 号：TU352.1[建筑科学—结构工程]