车桥耦合残余动力响应分析

发布时间：2018-07-31 05:05

【摘要】：近年来我国高速铁路的建设如火如荼,由于高速列车对轨道的平直度有非常高的要求,使得桥梁在高速铁路中被大量运用。我国在运行和在建的高铁项目中,桥梁所占的比重非常大,平均值在50%以上。当列车组通过铁路桥梁时,车轮与桥上铁轨接触产生复杂的作用力,从而使得铁轨下的桥梁结构产生振动,桥梁的振动又会反过来影响列车的运行。若车桥之间的耦合振动过大,可能会对列车的舒适甚至安全产生不利的影响。本文通过ANSYS有限元平台建立了一个简单易算的点线接触模型用于模拟车桥之间的耦合关系,并采用位移接触法来实现车在桥梁上的行走运行。采用该点线接触模型对几个车桥耦合响应问题进行有限元分析计算,将计算结果与对应的解析解、半解析解对比来验证模型可行性。本文还对对二维平面下车桥耦合振动展开研究,采用10自由度的平面半车模型模拟列车车厢,详细分析了在平顺与不平顺条件下,多跨连续梁桥和斜拉桥在高速列车通过时的各个车桥响应量的变化过程及规律。在列车与连续梁桥、斜拉桥的耦合分析中发现,桥梁发生共振与列车速度、车厢长度、桥梁跨长存在一定的关系。为进一步明确导致桥梁共振的各因素间的关系,本文将作用在桥梁上的列车简化为移动力组,探究了简支梁桥在车载作用下发生共振响应的机理以及规避共振的可行性方案。最后本文还结合共振与消振条件对箱形梁最佳跨长的选择展开了分析。
[Abstract]:In recent years, the construction of high-speed railway in our country is in full swing, because of the high speed train has a very high demand for the flatness of the track, so the bridge is widely used in the high-speed railway. Bridges account for a large proportion of the high-speed projects in operation and under construction in China, with an average of more than 50%. When the train group passes through the railway bridge, the contact between the wheel and the rail on the bridge produces complex force, which makes the bridge structure under the rail produce vibration, and the vibration of the bridge will affect the train operation in turn. If the coupling vibration between the vehicle and bridge is too large, it may have a negative impact on the comfort and even safety of the train. In this paper, a simple point-line contact model based on ANSYS finite element platform is established to simulate the coupling relationship between vehicle and bridge, and the displacement contact method is used to realize the running of the vehicle on the bridge. The point line contact model is used to analyze and calculate the coupling response of several vehicle-bridge models. The results are compared with the corresponding analytical solutions and semi-analytical solutions to verify the feasibility of the model. In this paper, the coupling vibration of two-dimensional plane alighting bridge is studied. The plane half-car model with 10 degrees of freedom is used to simulate the train carriage, and the conditions of ride comfort and irregularity are analyzed in detail. The variation process and regularity of each bridge response of multi-span continuous girder bridge and cable-stayed bridge when the high-speed train passes. In the coupling analysis of train and continuous girder bridge and cable-stayed bridge, it is found that the resonance of the bridge is related to the train speed, the length of the carriage and the span of the bridge. In order to further clarify the relationship between the factors leading to bridge resonance, this paper simplifies the train acting on the bridge into a moving force group, and probes into the mechanism of resonance response of the simply supported beam bridge under the action of the vehicle and the feasible scheme of avoiding the resonance. Finally, the selection of optimum span length of box beam is analyzed in combination with resonance and vibration suppression conditions.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3

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