Effect of train dynamics on seismic response of steel monorail bridges under moderate ground motion
Effect of train dynamics on seismic response of steel monorail bridges under moderate ground motion
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DOI：
10.1002/eqe.580
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发表时间：
2006-08
影响因子：
4.5
通讯作者：
Chul‐Woo Kim;M. Kawatani
中科院分区：
文献类型：
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作者：
Chul‐Woo Kim;M. Kawatani
本研究旨在利用三维动力反应分析方法，研究钢质单轨桥梁的地震反应。我们特别考虑了高概率地震动作用下的单轨桥梁-列车相互作用。假设单轨列车车辆由15个自由度的离散刚体多体系统充分描述，该转向架由两个充气轮系组成。桥梁被认为是梁单元的组合，每个节点有6个自由度。在中等地震作用下，采用振型分析方法进行动力响应分析。通过与常规桥梁地震反应的比较，研究了一座采用简化结构体系和组合梁的先进单轨桥梁的地震反应。计算了单轨列车的加速度响应，研究了桥梁结构型式对单轨列车地震动力响应的影响。结果表明，由于组合梁简化了结构体系，增加了梁体重量，使得先进桥梁的地震反应比传统单轨桥梁的地震反应大。此外，先进桥梁上的列车比常规桥梁上的列车具有更大的动力响应。观测表明，动力单轨列车系统对单轨桥梁起到了阻尼器的作用。这一事实表明，现有的将列车视为附加质量的设计产生了一个保守的结果。版权所有©2006 John Wiley&Sons，Ltd.
This study is intended to investigate the seismic response of steel monorail bridges using three‐dimensional dynamic response analysis. We particularly consider monorail bridge–train interaction when subjected to ground motion that occurs with high probability. A monorail train car with two bogies with pneumatic tires for running, steering and stabilizing wheels is assumed to be represented sufficiently by a discrete rigid multi‐body system with 15 degrees of freedom (DOFs). Bridges are considered as an assemblage of beam elements with 6 DOFs at each node. Modal analysis is used for dynamic response analysis under moderate earthquakes. The seismic response of an advanced monorail bridge that adopts a simplified structural system and composite girders is investigated through comparison with seismic responses of a conventional bridge. The acceleration response of a monorail train is also calculated to investigate the effect of structural types of bridges on the train's dynamic response during earthquakes. Results show that the seismic responses of the advanced bridges are greater than those of the conventional monorail bridge because of the simplified structural system and increased girder weight that is attributable to composite girders of the advanced bridge. Moreover, the train on the advanced bridge shows greater dynamic response than that on the conventional bridge. Observations reveal that the dynamic monorail train system acts as a damper on the monorail bridge. That fact shows that the existing design, which considers a train as additional mass, yields a conservative result. Copyright © 2006 John Wiley & Sons, Ltd.