Effect of foundation rigidity on train-bridge coupling vibration response

Environmental Vibrations: Prediction, Monitoring, Mitigation and Evaluation (ISEV 2005) Pub Date : 2021-06-23 DOI:10.1201/9781003209379-37

M. Gao, J. Pan, Y.Q. Yang

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Abstract

Along with the escalation of train speed, effect of foundation on train-bridge coupling vibration response becomes more and more significant. As for a 24 m single-track double T beam on the 3-span bridge of an existing line, it is measured that 7.85 mm lateral amplitude at pier top and 8.21 mm at mid-span when a train passing through within speed of 50-70 km/h. Such violent vibration will endanger running safety. In order to find out main cause of such big displacement, a train-bridge-foundation coupling dynamic analysis model is built. In this model, the effect of foundation is simplified as the equivalent moveable and rotational spring stiffnesses at pier bottom. Result of simulation analysis shows that relative weak foundation rigidity is the major factor. On the basis of this result, several kinds of reinforcement plans are studied respectively, one is main beam reinforcement plan, another is pier reinforcement plan and the third is foundation reinforcement plan. Finally, suggestions are put forward according to dynamic simulation analyses.

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基础刚度对列车-桥梁耦合振动响应的影响

随着列车运行速度的提高，基础对列车-桥梁耦合振动响应的影响越来越显著。对某现有线路3跨桥梁上的24 m单轨双T梁，在列车以50-70 km/h的速度通过时，测得桥墩顶部横向幅值为7.85 mm，跨中横向幅值为8.21 mm。这种剧烈振动将危及运行安全。为了找出产生如此大位移的主要原因，建立了列车-桥梁-基础耦合动力分析模型。在该模型中，将基础效应简化为墩底动簧和转动簧等效刚度。仿真分析结果表明，相对较弱的基础刚度是主要影响因素。在此基础上，分别对主梁加固方案、桥墩加固方案和基础加固方案进行了研究。最后，根据动态仿真分析提出了建议。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Environmental Vibrations: Prediction, Monitoring, Mitigation and Evaluation (ISEV 2005)

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