地铁运行引起建筑物振动的三维有限元分析

随着城市轨道交通的迅猛发展,大量建筑设施不可避免地受到周边铁路或地铁列车振动的影响。基于并行计算集群平台,建立了车辆-轨道-高架桥-基础-地基-建筑物耦合的大型三维有限元分析模型,得到了不同工况下列车运行引起地表及临近建筑结构的振动特征。主要结论如下:不同高度的建筑物在同一楼层的振级相差极小;随着车速的提高,建筑物各楼层的振级均呈逐渐增大趋势;此外,各楼层的振级随建筑物距高架桥距离的增大而逐渐减小。一般高度的建筑物各楼层的振级基本沿高度单调增加,顶层振级最大,而高层建筑物却有明显的拐点,在中间某层出现最大振级。建筑物各层楼板的竖直向振动峰值速度远大于水平向振动峰值。

3D FE Analysis on Building Vibration Induced by Train Running

Due to the rapid development of urban mass rail transit, plenty of adjacent buildings and infrastructures are unavoidably threatened by the vibration induced by train running. The present paper establishes a completely 3D finite element model of the train-track-viaduct-foundation-soil coupled system, based on a large-scale parallel computing cluster platform. The vibration behavior of the ground and the adjacent structures caused by trains running under different conditions are analyzed and the main conclusions can be drawn as follows: the floor vibration is not sensitive to the height of the building; with the increase of the train speed, the vibration level of each floor increases; with the increase of the distance from the building to the viaduct, the vibration level of each floor decreases; Generally, for low and moderate height multi-story buildings, especially for those of four stories or lower, there is a trend that the vibration level will increase with the floor elevation. Nevertheless, for high-rise buildings, the distribution of vibration versus the floors is different. The most significant vibration occurs on the floors at mid-span, depending on the height of the building. Furthermore, the maximum vibration velocity in the vertical direction is much higher than that in the horizontal direction.