城市轨道交通高架线路轻型浮置板轨道系统隔振性能分析

On the Vibration Isolation Effectiveness of Light Floating Slab Track on Urban Rail Transit Viaduct

通过仿真计算分析了两种轻型浮置板轨道系统的隔振性能、不同荷载作用位置对力传递率的影响及传递给基础的力。结果表明,在高于固有频率约1. 4倍时,两种浮置板轨道系统才有隔振效果,且两者隔振效果相差不大;力传递率在低于浮置板系统固有频率的低频段,载荷位置处在中间时较小,在边缘时稍大。普通轨道系统力传递率随离开荷载作用位置在振动频率100 Hz以上衰减很快,而两种浮置板随距离在振动频率10 Hz以上衰减较快。两种浮置板轨道系统在相同位移激励的轮轨力作用下传递给基础的力相差不大,并且在中高频具有良好的隔振性能。

The vibration isolation performance,the effect of different loading locations on transmission ratio and the interaction force transmission to the infrastructure of two floating slab tracks are analyzed through simulative calculation.The result shows that the effectiveness of vibration isolation for two types of floating slab track is produced only when the frequency is higher than 1.4 times of the normal and the difference of vibration isolation in both cases is small.The transmission ratio to interaction force infrastructure at the edge of loading location is a little larger than that in the medium at lower frequency.The transmission ratio to interaction force infrastructure is decayed faster at the frequency lower than 100 Hz on the common track,and at the frequency lower than 10 Hz when the floating slab tracks with distance changes.And transmission ratio to the interaction force infrastructure for both of floating slab tracks is not very different on wheel/rail interaction force due to the same displacement excitation,both will show better ability to block vibration transmission from track to the infrastructure in medium and high frequencies.