地铁运行引起的建筑结构振动响应分析

发布时间：2018-04-04 06:38

本文选题：环境振动　切入点：振动实测　出处：《华南理工大学》2014年硕士论文

【摘要】：随着我国地铁轨道交通的迅速发展，人们在享受地铁轨道交通带来的快捷和便利的同时，也越来越重视地铁列车运行时引起的振动对地面上邻近建筑物的影响。本文依据广州地铁3号线地面振动的实测数据，通过数值模拟方法来研究地铁运行时引起的环境振动问题。主要研究内容如下：根据实测得到的振动加速度的时程曲线，分析了地铁运行引起的地面振动的特性及其传播规律；利用傅里叶变换，得到振动加速度的傅里叶幅值谱，该频谱可以表示出地铁运行振动的频率组成以及振动在各频率段内的分布情况，进而为地铁沿线隔振减振提供数据支持；最后将按照相关公式计算出的振级与相关规范的限值进行对比，得到地铁沿线区域的振动水平。利用结构分析软件ANSYS，建立六层钢筋混凝土框架结构的有限元模型，将实测的振动波作为激励，按照一致输入和多点输入的方式进行加载，另外又考虑了结构距地铁隧道中心线距离的四种不同情况，通过计算得到结构的振动响应，对这些计算结果进行对比分析，得到了地铁运行引起周围建筑物的振动响应的特点。在对地铁周围建筑物的振动控制分析中，假定在建筑物基础处设置了橡胶隔振支座，对有隔振与无隔振时的结构振动响应分析结果进行对比分析。
[Abstract]:With the rapid development of subway rail transit in our country, people not only enjoy the speed and convenience brought by subway rail transit, but also pay more and more attention to the influence of vibration caused by subway train operation on the adjacent buildings on the ground.Based on the measured data of ground vibration of Guangzhou Metro Line 3, the environmental vibration caused by subway operation is studied by means of numerical simulation.The main contents of the study are as follows:According to the time-history curve of vibration acceleration, the characteristics and propagation law of ground vibration caused by subway operation are analyzed, and the Fourier amplitude spectrum of vibration acceleration is obtained by using Fourier transform.The frequency spectrum can indicate the frequency composition of the subway vibration and the distribution of the vibration in each frequency section, and then provide data support for the vibration isolation along the subway line.Finally, the vibration level along the subway line is obtained by comparing the vibration level calculated according to the relevant formula with the limit value of the relevant code.The finite element model of a six-story reinforced concrete frame structure is established by using the structure analysis software ANSYS.The vibration waves measured are taken as excitation and loaded according to uniform input and multi-point input.In addition, four different cases of the distance between the structure and the center line of the subway tunnel are considered. The vibration response of the structure is obtained by calculating the vibration response of the structure, and the characteristics of the vibration response of the surrounding buildings caused by the subway operation are obtained by comparing and analyzing the calculated results.In the vibration control analysis of the buildings around the subway, it is assumed that the rubber vibration isolation support is installed at the base of the building, and the results of vibration response analysis of the structure with and without vibration isolation are compared and analyzed.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U211.3;TU311.3

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