地铁引起建筑物振动评价研究

因为不能直接量测地铁环境中拟建建筑物的振动,介绍基于理论计算分析对地铁运行引起建筑物振动的评价方法。由于地铁隧道底面振动记录资料缺乏,量测困难;列车-轨道-地基系统的模拟不尽完善。针对上海地铁隧道正上方某拟建建筑物的振动问题,建立上部结构的刚性地基有限元模型,输入场地实测地面振动加速度激励,计算结构振动在时域内的响应。利用傅里叶变换,对结构时域内的响应进行频域分析,根据国家标准对地铁引起建筑物的振动做出评价,从而为地铁环境中建筑物防振设计提供依据。

Evaluation of Buildings' Vibration Induced by Underground Trains

The method, based on theoretical calculation, of evaluating building's vibration induced by underground trains is introduced. Because of the lack of vibration acceleration data recorded in tunnel invert, the difficulty of their measurement, and the imperfect simulation of train-track-soil system, a dynamic analysis model of a structure on a rigid foundation is established. Building's time-domain vibration acceleration response is obtained by the dynamic elastic finite element calculation of the model with the input acceleration which can be conveniently measured on the site ground. Furthermore, by Fourier transform, frequency-domain vibration acceleration response is achieved. The evaluation method is proposed according to the Chinese national standard of limit and measurement method of vibration in the room of residential buildings.