Coupling behavior of shear deformation and end rotation of elastomeric seismic isolation bearings
Coupling behavior of shear deformation and end rotation of elastomeric seismic isolation bearings
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DOI：
10.1002/eqe.2809
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发表时间：
2017-04
影响因子：
4.5
通讯作者：
K. Ishii;M. Kikuchi;T. Nishimura;C. Black
中科院分区：
文献类型：
--
作者：
K. Ishii;M. Kikuchi;T. Nishimura;C. Black
本文提出了一个机械模型，用于预测弹性体隔震轴承在端部旋转和剪切变形联合作用下的行为。机械模型由位于轴承顶部、中间高度和底部的一系列轴向弹簧组成，用于垂直重现轴承中的不对称弯矩分布。该模型可以考虑轴承的端部旋转，整体旋转刚度包括轴承上垂直载荷变化和施加的剪切变形的影响。在垂直载荷和剪切变形的各种组合下进行静态弯曲试验，以确定轴承的机械特性。试验结果表明，轴承旋转刚度随着垂直载荷的增加而增加，但随着剪切变形的增加而减少。进行仿真分析以验证新的机械模型。使用新模型的分析结果与实验观察结果非常吻合。进行了一系列地震响应分析，以证明柱顶隔震结构的动态行为，在这种配置中，隔震支座的端部旋转通常预计会更大。结果表明，实际柱顶隔震结构中使用的弹性轴承的端部旋转不会降低隔震系统的稳定性极限。版权所有 © 2016 约翰·威利父子有限公司
This paper presents a mechanical model for predicting the behavior of elastomeric seismic isolation bearings subject to combined end rotations and shear deformation. The mechanical model consists of a series of axial springs at the top, mid‐height and bottom of the bearing to vertically reproduce asymmetric bending moment distribution in the bearings. The model can take into account end rotations of the bearing, and the overall rotational stiffness includes the effect of the variation of vertical load on the bearing and the imposed shear deformation. Static bending tests under various combinations of vertical load and shear deformation were performed to identify the mechanical characteristics of bearings. The test results indicate that bearing rotational stiffness increases with increasing vertical load but decreases with increasing shear deformation. Simulation analyses were conducted to validate the new mechanical model. The results of analyses using the new model show very good agreement with experimental observations. A series of seismic response analyses were performed to demonstrate the dynamic behavior of top‐of‐column isolated structures, a configuration where the end rotations of isolation bearings are typically expected to be larger. The results suggest that the end rotations of elastomeric bearings used in practical top‐of‐column isolated structures do not reduce the stability limit of isolation system. Copyright © 2016 John Wiley & Sons, Ltd.