地铁运行列车引起建筑物低频振动的数值分析

采用施加在轨道上的一系列移动轴荷载模拟列车作用,利用轨道结构连续弹性双层梁模型,计算出某城市地铁列车运行产生的轨枕与隧道之间的作用力。在此基础上,建立隧道-土层-建筑物有限元模型分析了不同车速下不同距离建筑物中不同楼层的振动规律。分析结果表明:移动列车轴荷载引起建筑物低频振动;车速越高,建筑物的竖向振动水平越高;随着到轨道中心线距离的增加,建筑物竖向振动水平逐渐减小;不同楼层竖向振动水平基本接近。

Numerical analysis of building under low- frequency vibrations induced by subway running train

The train was simulated by a series of moving axle load applied on the track.Using the continuous elastic double layers beam model of track structure,the forces between the sleepers and the tunnel inlay produced by the running of certain subway train were calculated.On the basis of the model,numerical model of tunnel-soil-building was established.The vibration characteristics of different floors of the building with different distances to the railway track and at different train speeds were obtained.The results show that the moving train axle load induces building low-frequency vibrations.Higher train speed induces larger structural vertical vibrations.The longer the distance between a building and the track,the smaller the structural vertical vibrations would be.The vertical vibration levels of different floors are basically the same.