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考虑瞬时脱离的列车作用下桥梁振动分析

DOI: 10.3969/j.issn.1674-0696.2014.02.05, PP. 21-25

Keywords: 桥梁工程,车-桥耦合单元,车轮瞬时脱离,Hertz接触,车-桥共振,动力分析,bridgeengineering,vehicle-bridgeinteractionelement,transientjumpofwheel,Hertzelasticitycontact,vehicle-bridgeresonance,dynamicanalysis

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Abstract:

:?采用非线性Hertz接触理论,并将其线性化,推导了考虑车轮瞬时脱离的车-桥耦合分析单元,解决了传统分析中“车轮密贴”假设的不足;应用形成矩阵的“对号入座”法则建立了耦合系统动力方程,并给出了其组装和求解思路;编制了相应计算程序,对现有铁路桥梁进行了分析。结果表明:车桥共振时,桥梁动力响应会显著增大,而移动力模型结果更偏于安全,脉冲型不平顺会激起强烈的高频振动,使桥梁加速度响应显著增加;未发生脱离时,考虑和不考虑脱离模型所得结果一样,而发生脱离时,后者结果将不准确,而前者准确模拟出了脱离现象;应采用考虑车轮脱离的模型进行车-桥耦合振动分析,同时应重视线路养护维修和桥梁变形控制。

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