高速火车移动荷载作用下铁路桥的实时振动

Vibrations of Railway Bridges for High Speed Trains Under Moving Loads Varying in Time

试验测量显示火车轮传递的荷载不仅包括常量成分,而且在0～6Hz范围有更大的交互成分。采用随时间变化的简支梁模型,分析了在组合荷载作用下,中小跨桥产生的挠度。第一个案例是分析单轴荷载传递,常量与变量交互作用下组合荷载的挠度。第二个案例是分析等距离多轴荷载传递,不同组合荷载作用下的综合效果。对速度、频率的影响以及交互成分状态进行细节分析,确定通过几个轴传递力的情况下,共振及抵消可能发生的条件。

Experimental measurements show that the loads transmitted from train axles contain not only a constant component, but also significant alternating components in the range 0 - 6 Hz. Using the model of a simply supported beam transited by moving loads varying in time, the authors analyse the deflections produced in small and medium span bridges under the action of combined loads. A first case is the deflection under the combined load owing to a constant component together with an alternating component and transmitted by a single axle,