快速重载作用下浮桥位移波传播特性研究

On the displacement wave propagation of the floating bridge subjected to high-speed and heavy load

为研究快速重载作用下柔性浮桥位移波的传播特性,利用弹性基础梁理论,建立了浮桥的运动控制方程,并用振型叠加法进行求解。计算了浮桥位移波的传播速度、不同荷载速度下位移波最大振幅与浮桥最大位移的比值以及荷载处坡度随速度的变化曲线。结果表明:在重载快速通过时,柔性浮桥会激发位移波向两端传播,当荷载运动速度与位移波传播速度相当时,会有位移波堆积和荷载爬坡等新的现象出现,而且荷载运动速度越大,这种现象越明显。

To investigate the displacement wave propagating characteristics of the flexible floating bridge that is subjected to high-speed and heavy load, the dynamic equation of the floating bridge is presented and solved by means of superposition meth od and the theory of beam on elastic foundation is employed. The displacement wave propagation velocities, the ratio of the maximum wave amplitude to the maximum displacement of floating bridge and the time history of the slope at the load place with respect to load velocity are gained. The numerical results show that the displacement wave will propagate towards both sides of the floating bridge subjected to high-speed and heavy load. New phenomena including the displacement wave accumula- tion and load-climbing-slopes will occur when the velocity of moving load is faster than that of propagation of the displacement wave. And these phenomena will be more visible when the velocity of load is higher,/