基于动态子结构法探讨地铁列车运行引起建筑物的振动

Application for Dynamic Sub-structuring Method in the Analysis of Building Vibration Caused by Metro Train

运用动态子结构固定界面模态综合法,结合Ansys有限元分析软件建立隧道-土层-建筑物系统动力学分析模型,通过与有限元整体建模分析法进行比较,验证了动态子结构法的准确性,对比分析系统的振动特性,分析隧道埋深、桩基深度对建筑物振动的影响。分析结果表明:隧道上方的建筑物桩基不利于建筑物减振,增加隧道埋深、增加隧道与建筑物桩尖的距离,可以有效降低建筑物振动。固定界面模态综合法具有较高的精度,计算效率高,在地铁列车引起建筑物振动分析中具有较好的适用性。

A dynamic model for the tunnel-ground-building coupling system is established by using the fixed-interface component mode synthesis,a dynamic substructure method,combining with the Ansys software.The accuracy of the dynamic substructure method is validated and the vibration characteristic of the coupling system is analyzed by comparing with the whole finite element analysis model.Influences of the tunnel buried depth and the depth of pile foundation on the building vibration are investigated.The computation show that the building pile foundation at the top of the tunnel is not conducive to reduce the building vibration,and increasing the tunnel buried depth and increasing the spacing between the tunnel and the pile tip can effectively reduce the vibration of the building.The fixed interface modal synthesis method has high precision and calculation efficiency,is suitable to analyze the building vibration caused by metro train.