地铁引起某砖混结构振动的数值分析

The Numerical Analysis of Brick Structure Vibration by Subway

摘要: 为了更好地提升地铁邻近居民的居住环境质量，针对地铁运行带来的结构振动问题，本文以西安某建筑物为研究对象，在有限元软件ANSYS中建立轨道–隧道–土体–建筑物三维仿真有限元耦合模型，研究建筑物在不同车速、不同车型、不同层高下的振动规律，为类似的地铁沿线建筑物结构振动预测提供一定参考。得到的结论有：在车速、车型的变化下，地铁列车运行引起的建筑物结构振动峰值位置未改变，都主要集中在63 Hz和80 Hz；结构振动随着车速的变大而变大，随着地铁车型由B变为A而变大，但其中车型变化对振动的影响并不大，VL_zmax仅相差2 dB左右；建筑物各层振动随着楼层的增加，先减小后增大，故减振降噪时需要特别注意其对底层和顶层的作用。

Abstract: For the structural vibration problem brought by metro operation, the paper takes a building in Xi’an as the research object and establishes a three-dimensional simulation coupling model of track-tunnel-soil-buildings in the finite element software ANSYS to study the vibration law of buildings under different vehicle speeds, different vehicle types and different floor heights. It can provide some reference for the structural vibration prediction of similar buildings along the subway, so as to make the living environment quality better for the residents adjacent to the subway. With the change of speed and model, it shows that the peak vibration of the building structure caused by the operation of subway trains is mainly concentrated at 63 Hz and 80 Hz. When the speed of the subway operation becomes greater or when the model changes from B to A, structural vibration of the building becomes greater. However, the change of metro vehicle type has little impact on vibration, and the difference in VL_zmax is only about 2 dB. With the increase of floors, the vibration of each floor of the building first decreases and then increases. Therefore, when taking vibration and noise reduction measures, we need to pay special attention to their effect on the ground floor and the top floor.