三维多功能隔振支座设计及其在地铁建筑减振中的应用

Design of a three dimensional isolation bearing and its application in building vibration control induced by underground train

为了减小地铁运行引起的建筑振动,采用三维多功能隔振支座提高地铁沿线建筑物的舒适度。所用三维多功能隔振支座为铅芯橡胶支座和碟形弹簧组合而成,设置位置为建筑物底部。采用时程分析法研究结构在地铁振动荷载作用下的响应,对三维多功能隔振支座的隔振效果进行对比分析。研究表明,设置有三维多功能隔振支座的结构在地铁振动荷载作用下,楼板的竖向振动加速度明显减小,短跨及长跨方向的水平振动均有较好的隔振效果。三维多功能隔振支座能有效提高地铁沿线建筑物的舒适度。

In order to control the buildingvibration induced by underground train, and to improve the floor comfort degree of buildings, a three dimensional isolation beating is designed. The isolation beating consists of lead rubber bearing and disc springs. The new bearings are installed at the bottom of a structure. Time history method is used to study the responses of a common frame structure and an isolated frame structure under the vibration induced by underground train. The study shows that the vertical vibration of the structure with the three dimensional isolation bearings is smaller than that of the common frame structure; the horizontal vibration control of short span and long span are also obvious. The three dimensional isolation bearing is useful in building vibration control.