3DIB三维基础隔震模型振动台试验研究  

Shaking table tests of three-dimensional base-isolated model with 3DIB

作　　者：赵亚敏[1] 苏经宇[2] 陆鸣[1] 

机构地区：[1]中国地震局地壳应力研究所,北京100085 [2]北京工业大学建筑与城市规划学院,北京100124

出　　处：《建筑结构学报》2010年第S2期105-111,共7页Journal of Building Structures

基　　金：中国地震局地壳应力研究所中央级公益性科研院所基本科研业务专项资助项目(ZDJ2009-08);国家自然科学基金资助项目(50278093)

摘　　要：提出了一种组合式三维隔震支座(3DIB),由铅芯橡胶支座(LRB)和组合式碟形弹簧竖向隔震支座(DSB)组合而成。性能试验结果表明,3DIB的水平特性以LRB为主,竖向特性以DSB为主。为了验证3DIB的三维隔震效果,采用不同地震波进行了1/2比例的基础固定模型及3DIB三维隔震模型振动台试验。结果表明,3DIB具有明显的水平、竖向隔震效果。随着输入地震加速度幅值的增加,3DIB基础隔震模型的隔震层分别发生较大的水平及竖向变形,而上部结构的层间相对位移变化不大。输入加速度幅值为0.4g时,3DIB隔震模型x、y向的加速度反应降低了60%以上,z向的加速度反应降低了50%以上,三维隔震效果显著。Combined 3-dimensional isolation bearing(3DIB) for 3-dimensional base-isolated building is introduced in this paper.3DIB is combined with lead rubber bearing(LRB) and disk spring bearing(DSB).Performance test results of the 3DIB show that the horizontal properties and vertical properties of the 3DIB are determined by LRB and DSB,respectively.A series of shaking table tests of the 1/2 scale fixed-base model and the 3DIB base isolated system were carried out and compared to confirm the validity of the 3DIB.Results show that the 3DIB can isolate 3-dimensional earthquake energy remarkably.With the acceleration amplitude increased,larger displacement of the 3DIB base isolated system occurred on the isolation layer,and the inter-story deformation of the superstructure changed slightly.The horizontal acceleration responses of 3DIB model decreased more than 60% and the vertical acceleration responses decreased more than 50% under seldom earthquake input,which confirmed that 3DIB could reduce the 3-dimensional seismic responses obviously.

关 键 词：三维隔震 振动台试验 地震反应 

分 类 号：TU352.12[建筑科学—结构工程]