滚轴基础隔震的动力分析  

Dynamic analysis of base isolation by free rolling rods

作　　者：张新中[1] 韩爱红[1] 邓子辰[1] 

机构地区：[1]西北工业大学工程力学系,西安710072

出　　处：《沈阳工业大学学报》2007年第3期241-246,共6页Journal of Shenyang University of Technology

基　　金：河南省科技攻关计划资助项目(496450009);西北工业大学研究生创业种子基金资助项目(Z200624)

摘　　要：为了分析滚轴隔震结构在地震作用下的动力响应,在滑移隔震研究的基础上,针对滚轴纯滚动运动特点,推导出了滚轴隔震结构的动力方程.对某一工程实例采用滚轴隔震的方法,进行了在El-Centro地震波作用下的数值模拟仿真,并分析了隔震结构的峰值加速度、相对位移、基底位移和基底残余位移等.结果表明:滚轴隔震能有效地减缓上部结构在强震时的响应.当滚动摩阻系数大于0.15 cm时可以不施加限位装置,滚动摩阻系数越小,上部结构的加速度和层间位移越小,进一步减缓上部结构“鞭梢效应”的效果越明显.The seismic responses of multi-storey shear type buildings isolated by roiling rods were studied. Through taking the characteristics of pure rolling into account based on the sliding isolation, the equation of rolling isolation was proposed. The responses of the roiling isolation structure were compared with the corresponding fixed base structure in order to investigate the effectiveness of the rolling rods. The results demonstrate that the method of rolling rods is effective in reducing the response of the super-structure against strong earthquake excitation. When the rolling friction coefficient is great than 0.15 cm, the limited device can be cancelled. The effectiveness of the rolling rods in reducing the seismic response of the structure decreases with an increase in the rolling friction coefficient. In addition, the storey-shift and whip-tip effect of the upper-structure become unremarkable with decreasing the rolling friction coefficient.

关 键 词：滚轴隔震 滚动摩阻系数 纯滚动 层间剪切模型 数值模拟 鞭梢效应 

分 类 号：TH133.332[机械工程—机械制造及自动化]