直线电机列车作用下桥梁动力系数研究

【作者】 李鹏；

【导师】 何旭辉；

【作者基本信息】 中南大学 ， 桥梁与隧道工程， 2009， 硕士

【摘要】 国内很多城市已经采用了轨道交通系统,但针对城市轨道交通桥梁的专门规范还没有建立。本文以广州市轨道交通四号线高架结构为工程背景,通过建立直线电机(LIM)列车-桥梁体系动力分析模型,对直线电机作用下桥梁的动力响应进行了分析,结合动力系数现场测试结果,提出了直线电机(LIM)列车作用下桥梁动力系数建议公式。具体研究工作及研究成果如下:1.较系统的介绍了城市轨道交通的发展现状,直线电机轨道交通的发展历史及特点。2.研究了各国铁路桥梁设计规范中相应的计算公式,以及我国城市轨道交通动力系数的研究历史与现状。3.视列车、桥梁为一个整体系统,将桥梁用有限元离散,利用曾庆元院士提出的弹性系统动力学势能不变值原理及形成矩阵的“对号入座法则”,建立了有限元形式的系统振动矩阵方程。4.基于MATLAB平台,编制了车桥耦合系统的动力响应分析程序,可以用来计算桥梁的竖向动力响应。5.在广州市轨道交通四号线进行了LIM车辆作用下的现场动力系数试验,通过现场试验和试验结果分析得到了桥梁的动挠度,以及动力系数。6.总结理论分析和实测动力系数结果,提出了LIM列车作用下桥梁动力系数的动力系数计算建议公式,为城市轨道交通桥梁的安全设计提供科学依据。更多还原

【Abstract】 In china, many cities have adopted the Linear Induction Motor(LIM) rail transit system, but for the norms of urban rail transit has not yet been established. In this paper No.4 Guangzhou subway were analyzed as case study ,by establishing a dynamic analysis model of LIM train-bridge system, the analysis on the responses of bridge under the action of running train was conducted, combination with experimental analysis, a reasonable formula for determination of the dynamic factors is presented. The main contents of this study are shown follows:1. The development at home and abroad of the urban rail transit and LIM rail transit system are introduced.2. Referring to the dynamic factors, the formulae for determination of these factors recorded in the codes of several countries, as well as the dynamic factors for a bridge in an urban railway transportation system in our country is studied.3. A train, bridge have been considered as an entire system, in which the bridge have been divided into a finite number of beam elements, respectively. The equation of motion for this system has been formulated by means of the principle of total potential energy with stationary value in elastic system dynamics and the "set-in-right-position" rule for formulating matrices, with both the principle and the rule being presented by academician Qingyuan Zeng.4. Based on the platform of MATLAB, an assocatied program was developed for dynamic analysis of coupled, which can use to calculate the vertical dynamic response of the bridge.5. The dynamic factors experiment were carried out on the No.4 Guangzhou subway. The main measured include the lateral displacements, and the dynamic factors.6. Combination with experimental analysis, a reasonable formula for determination of the dynamic factors of urban rail transit is presented.更多还原