考虑瞬时脱离的列车作用下桥梁振动分析

发布时间：2018-05-06 06:45

本文选题：桥梁工程 + 车-桥耦合单元　；参考：《重庆交通大学学报(自然科学版)》2014年02期

【摘要】：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。
[Abstract]:Based on the nonlinear Hertz contact theory and linearization, the vehicle-bridge coupling analysis unit considering the instantaneous wheel detachment is derived, which solves the deficiency of the "wheel tightness" hypothesis in the traditional analysis. In this paper, the dynamic equations of coupled system are established by using the law of "entering seat" to form the matrix, and the assembly and solution ideas are given, and the corresponding calculation program is worked out, and the existing railway bridges are analyzed. The results show that the dynamic response of the bridge increases significantly when the vehicle-bridge resonates, but the result of the moving dynamic model is more safety. The pulse-type irregularity will arouse the strong high-frequency vibration and make the acceleration response of the bridge increase significantly, but when the bridge does not break away, Considering the same results as those obtained without considering the detaching model, when the breakaway occurs, the latter result will not be accurate, and the former can accurately simulate the breakaway phenomenon, and the model considering the wheel breakaway should be used to analyze the vehicle-bridge coupling vibration. At the same time, attention should be paid to line maintenance and bridge deformation control.
【作者单位】：华中科技大学土木工程与力学学院;中铁大桥局集团武汉桥梁科学研究院有限公司;
【基金】：国家自然科学基金项目(51078164) 湖北省自然科学基金项目(2013CFA135)
【分类号】：U441.3

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