A parametric study of seismic behavior of roller seismic isolation bearings for highway bridges
A parametric study of seismic behavior of roller seismic isolation bearings for highway bridges
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DOI：
10.1002/eqe.958
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发表时间：
2009-09
影响因子：
4.5
通讯作者：
Y. Ou;Jianwei Song;George C. Lee
中科院分区：
文献类型：
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作者：
Y. Ou;Jianwei Song;George C. Lee
建议在公路桥梁中使用滚轮隔震支座。该轴承利用滚动机构实现隔震，在水平地面运动下具有零后弹性刚度、自定心能力以及独特的摩擦装置用于补充能量耗散。本研究的目的是根据 AASHTO 指南规范，使用参数研究 (1) 非线性响应历史分析和 (2) 等效线性分析来研究拟议轴承的地震行为，并通过比较两种分析方法 (3) 的结果来评估 AASHTO 等效线性方法预测地震期间拟议轴承峰值位移的准确性。研究中使用了二十八种地面运动。检查的参数包括支座中间板的倾斜角度、补充能量耗散的摩擦力大小以及地面运动的峰值地面加速度水平。计算轴承的峰值位移和基础剪力。研究结果表明，对于大多数没有摩擦装置的参数组合来说，较大的倾斜角不会降低峰值位移。然而，对于与摩擦装置的参数组合，它允许使用更高的摩擦力，从而有效地降低峰值位移，同时保持自定心能力。 AASHTO 等效线性方法可能会低估峰值位移达 40%。垂直地面运动对峰值位移影响不大，但显着增加峰值基础剪力。版权所有 © 2009 约翰·威利父子有限公司
A roller seismic isolation bearing is proposed for use in highway bridges. The bearing utilizes a rolling mechanism to achieve seismic isolation and has a zero post‐elastic stiffness under horizontal ground motions, a self‐centering capability, and unique friction devices for supplemental energy dissipation. The objectives of this research are to investigate the seismic behavior of the proposed bearing using parametric studies (1) with nonlinear response history analysis and (2) with equivalent linear analysis according to the AASHTO guide specifications, and by comparing the results from both analysis methods (3) to evaluate the accuracy of the AASHTO equivalent linear method for predicting the peak displacement of the proposed bearing during an earthquake. Twenty‐eight ground motions are used in the studies. The parameters examined are the sloping angle of the intermediate plate of the bearing, the amount of friction force for supplemental energy dissipation, and the peak ground acceleration levels of the ground motions. The peak displacement and base shear of the bearing are calculated. Results of the studies show that a larger sloping angle does not reduce the peak displacement for most of the parametric combinations without friction devices. However, for parametric combinations with friction devices, it allows for the use of a higher friction force, which effectively reduces the peak displacement, while keeping a self‐centering capability. The AASHTO equivalent linear method may underestimate the peak displacement by as much as 40%. Vertical ground motions have little effect on the peak displacement, but significantly increase the peak base shear. Copyright © 2009 John Wiley & Sons, Ltd.