初始条件对列车-桥梁耦合振动的影响研究

Influence of the Initial Condition on the Vehicle-Bridge Coupling Vibration

针对列车上桥前位移、速度及加速度等初始条件对桥梁结构振动产生的影响,本文以单跨简支梁为例,采用10个自由度的列车垂向振动模型,通过Ansys和Matlab编程,从时域和频域两方面研究初始条件对列车-桥梁耦合振动的影响。研究结果表明,列车的初始条件对桥梁结构位移及速度的影响比较小,对加速度的影响非常大;列车初始条件主要对桥梁结构的高阶振型产生影响;桥梁结构加速度时程曲线的稳定速度低于位移和速度。该分析为车桥耦合振动方面的研究提供了一定参考依据。

The initial condition of train, such as displacement, velocity, acceleration and so on, before get- ting on the bridge, has a certain influence on the bridge vibration. In this paper, a single-span simple-sup- ported-beam bridge is taken as an example. A ten-degree of freedom vertical modal is adopted to simulate the train. The analysis is carried on separately in the time domain and frequency domain by Ansys and Matlab. The results show that the initial condition of train has little influence on displacement and velocity of the bridge but it has significant influence on the acceleration; the initial train condition mainly affects the high frequency of the bridge structure; the acceleration time-history curve of the bridge structure is stabili- zing slower than the displacement and the velocity. The research can provide a reference for the study on Vehicle-Bridge Coupling Vibration.