拱桁组合体系桥横向刚度分析

将列车-拱桁组合体系桥视为一整体振动系统,由势能驻值原理及形成结构矩阵的对号入座法则,导出此系统横向振动的矩阵方程,以车辆构架在桥上的实测蛇形波和车辆轮对在线路上的实测蛇形波为激振源.计算了41号桥的横向全振幅,计算值与实测值接近.通过九江长江大桥舒适度指标的计算,表明该大桥具有良好的横向刚度.

Lateral Rigidity Analysis of Bridge Composed of Arch and Truss Structural System

The train and bridge composed of arch and truss structures are considered as a whole vibrating system.The lateral vibration equations in matrix form of the system are derived by application of the variational principle of the stationary potential energy and the "set-in-right position" rule of forming structural matrices.Taking the hunting curves of the underframe of the railway car on bridge and the hunting curves of the wheelsets on track obtained from test as the vibrating source,the paper calculates the double amplitude of Bridge 41.The results are close to the test values.Through the calculation of the comfortableness of Jiujiang Yangtse River Bridge,the conclusion is obtained that it has sufficient lateral rigidity.