基于多点输入的地铁引起房屋振动评价研究

建立结构二维有限元分析模型，利用现场实测地铁运行引起地面振动加速度时程记录，采用多点输入，计算刚性地基上一框架结构由于地铁运行引起的振动加速度值；在此基础上，利用傅里叶变换计算1／3倍频程1Hz～80Hz内各频段对应的振动加速度级。利用同样的计算模型，采用一致输入和行波输入计算结构的振动强度；比较三种激励方式的计算结果，从而考察行波效应等对结构振动的影响。对地铁引起房屋振动做出评价。

Quantitative Evaluation of Underground Train-induced Vibrations of a Frame Structure under Multi-supports Excitation

Uniform excitation was used in almost all the existing literatures to determinate the underground train-induced vibrations in buildings. In this paper, a methodology for the quantitative evaluation of underground train-induced vibrations in a frame structure with consideration of multi-support excitation is presented. Two-dimensional finite element model is developed, using the results of a ground vibration measurement campaing purposely performed at the site as input excitations. The vibration levels in the structure are obtained to multi-support excitation, and the levels for traveling wave excitation and uniform excitation are also, respectively, calculated so that the comparison of the vibration levels in the building to the three types of excitations can be made. Furthermore, the quantitative evaluation of the vibration levels in the building is made.