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本文将列车-桥梁视为一整体系统,由势能驻值原理及形成矩阵的“对号入座”法则,建立系统横向振动方程,以机车车辆轮对及构架的实测蛇行时程曲线为激振源,算出了货物列车以5种车速通过4座不同跨度钢桁梁桥时的车辆及桥梁振动响应过程(从机车进桥至车尾离桥)波形图、列车横向摇摆力和侧倾力的波形图。分析这些波形图,可以得出一些具有一定规律的现象。
In this paper, the train-bridge is regarded as a whole system. Based on the principle of potential energy and principle of “condemnation” forming a matrix, a horizontal vibration equation of the system is established. The measured meandering curve of wheelset and frame of locomotive is used as excitation source. The waveforms of the vehicle and bridge vibration responses (from the bridge of the locomotive to the rear of the bridge), the wave train of the lateral swing force and the roll force of the train when the freight train passes the four different span steel truss girders at five kinds of speeds. Analysis of these waveforms, we can draw some have a certain law of the phenomenon.