铁路曲线连续梁桥车桥耦合振动分析

将曲线通过车辆和曲线连续梁桥分为两个由非线性轮轨接触力联系的振动子系统。运用车桥耦合振动理论,建立铁路车辆曲线通过模型动力方程、曲线梁桥模型及其动力方程。基于激励非线性振动的数值算法,编制曲线梁桥车桥耦合振动分析软件VCBID,进行一座铁路曲线连续梁桥车桥耦合振动响应分析。结果表明:行驶速度对曲线连续梁桥竖向振幅的影响较大,但曲线连续梁桥的竖向振幅并不总是随行驶速度的增加而增加;曲线连续梁桥的横向位移随行驶速度的增大而增大,大致呈线性关系;车辆的横向加速度、竖向加速度、脱轨系数和轮重减轻率均随车辆行驶速度的增加而增加,且均满足我国现行规范的要求。

Analysis of Vehicle-Bridge Coupling Vibration on Railway Curve Continuous Beam Bridge

Take the curve negotiating vehicle and curve continuous beam bridge as two vibration subsystems connected by nonlinear contact force between wheel and track. By applying vehicle-bridge vibration theory, dynamical model and equation of railway curve negotiating vehicle as well as the model and equation of curve beam bridge are established. By using numerical algorithm based on excitation nonlinear vibration, the software VCBID is developed to analyze vehicle-bridge coupling vibration on curve beam bridge. Vehicle-bridge coupling vibration response of a certain railway curve continuous beam bridge is analyzed. The result indicates that the running speed has a greater impact on the vertical amplitude of curve continuous beam bridge. However, the vertical amplitude of curve continuous beam bridge doesn't increase at all time with the increase of the running speed. The lateral displacement of the curve continuous beam bridge increases with the increase of the running speed and their relation is approximately linear. The lateral acceleration, the vertical acceleration, the derailment coefficient and rate of wheel load reduction increase with the increase of the running speed and all meet the requirements of the current national criteria.