Experimental and analytical study on pounding reduction of base‐isolated highway bridges using MR dampers
Experimental and analytical study on pounding reduction of base‐isolated highway bridges using MR dampers
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DOI：
10.1002/eqe.903
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发表时间：
2009-09
影响因子：
4.5
通讯作者：
A. Guo;Zhongjun Li;Hui Li;J. Ou
中科院分区：
文献类型：
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作者：
A. Guo;Zhongjun Li;Hui Li;J. Ou
在过去的几次地震中，相邻上层建筑之间的撞击是公路桥损坏的主要原因。本文采用磁流变阻尼器对公路桥梁在地震地震动作用下的减振进行了试验和分析研究。建立了考虑结构冲击和MR阻尼的分析模型。在1:20比例的基础隔离桥模型上进行了一系列振动台试验，以研究相邻上部结构之间的冲击对结构动力学的影响。根据试验结果，确定了线性和非线性粘弹性冲击模型的参数。实验还研究了半主动系统减少结构冲击的性能，其中MR阻尼器与所提出的控制策略相结合，以验证MR阻尼器的有效性。利用所建立的解析模型对结构响应进行了模拟，并与振动台试验结果进行了比较。结果表明：相邻上部结构之间的碰撞会显著增加结构的加速度响应；对于这里考虑的基础隔离桥模型，带有MR阻尼器的半主动控制系统有效地防止了冲击。版权所有©2009 John Wiley & Sons， Ltd
Pounding between adjacent superstructures has been a major cause of highway bridge damage in the past several earthquakes. This paper presents an experimental and analytical study on pounding reduction of highway bridges subjected to earthquake ground motions by using magnetorheological (MR) dampers. An analytical model, which incorporates structural pounding and MR dampers, is developed. A series of shaking table tests on a 1:20 scaled base‐isolated bridge model are performed to investigate the effects of pounding between adjacent superstructures on the dynamics of the structures. Based on the test results, the parameters of the linear and the nonlinear viscoelastic impact models are identified. Performance of the semiactive system for reducing structural pounding is also investigated experimentally, in which the MR dampers are used in conjunction with the proposed control strategy, to verify the effectiveness of the MR dampers. Structural responses are also simulated by using the established analytical model and compared with the shaking table test results. The results show that pounding between adjacent superstructures of the highway bridge significantly increases the structural acceleration responses. For the base‐isolated bridge model considered here, the semiactive control system with MR dampers effectively precludes pounding. Copyright © 2009 John Wiley & Sons, Ltd.