横风作用下车—桥系统气动性能及动力响应研究

发布时间：2018-10-30 10:14

【摘要】：近年来,随着我国高速铁路的不断发展,部分斜拉桥凭借其柔美的美学效果、可灵活设置的跨径、简便的施工及良好的经济性能等特点,目前在我国已经成为铁路建设的主流,但由于我国部分斜拉桥的起步较晚,其抗风性能及动力特性的研究较少。本文以某部分斜拉桥为背景,采用三维数值模拟的方法对横风作用下车-桥系统的气动性能进行研究,并对该斜拉桥的静风响应以及风和列车共同作用下桥梁动力特性进行分析。主要工作和结论如下:1.建立某部分斜拉桥的三维模型,采用数值模拟的方法,得到桥梁在不同风场作用下的三分力系数,分析了风攻角、风速及桥墩对桥梁三分力系数的影响,并采用有限元软件Midas Civil对桥梁进行静风响应分析。结果表明,在0°攻角下,当风速达到80m/s时,该斜拉桥未发生静风失稳,安全性可以得到保障。2.当列车在桥梁上运行时会带动周围空气运动,形成"列车风",对桥梁周围的流场特性产生巨大的影响,选取某型列车简化模型,采用三车编组,采用滑移网格技术模拟列车在斜拉桥运行,对横风作用下列车通过桥梁时车-桥系统气动性能进行分析。结果表明,桥梁和列车气动力及气动力矩随着车速和风速变化显著。3.基于高速列车多体动力学基本理论,通过Simpack软件建立列车的仿真模型,将横风作用下高速列车通过桥梁时的气动力及气动力矩施加到多体动力学模型中,得到其轮轨作用力。通过Midas Civil斜拉桥模型,分析桥梁在风和列车共同作用下动力响应。结果表明,列车在该斜拉桥上运行时对桥梁的横向位移和横向加速度有较大影响。
[Abstract]:In recent years, with the continuous development of high-speed railway in China, some cable-stayed bridges have become the mainstream of railway construction in our country because of their soft aesthetic effect, flexible span, simple construction and good economic performance. However, due to the late start of some cable-stayed bridges in China, there are few researches on their wind resistance and dynamic characteristics. In this paper, a part of cable-stayed bridge is used as the background, and the aerodynamic performance of the off-bridge system under cross-wind action is studied by using three-dimensional numerical simulation method. The static wind response of the cable-stayed bridge and the dynamic characteristics of the bridge under the action of wind and train are analyzed. The main work and conclusions are as follows: 1. The three-dimensional model of a partial cable-stayed bridge is established, and the three-point force coefficient of the bridge under different wind fields is obtained by numerical simulation. The influence of wind attack angle, wind speed and pier on the three-point force coefficient of the bridge is analyzed. The static wind response of the bridge is analyzed by finite element software Midas Civil. The results show that at 0 掳angle of attack, the static wind instability of the cable-stayed bridge does not occur when the wind speed reaches 80m/s, and the safety can be guaranteed. When the train is running on the bridge, it will lead to the movement of the surrounding air and form "train wind", which has a great influence on the characteristics of the flow field around the bridge. The simplified model of a certain type of train is selected and the three-car marshalling is adopted. The sliding grid technique is used to simulate the train running in the cable-stayed bridge. The aerodynamic performance of the vehicle-bridge system is analyzed when the train passes through the bridge under the action of crosswind. The results show that aerodynamic force and aerodynamic moment of bridge and train vary significantly with speed and wind speed. Based on the basic theory of multi-body dynamics of high-speed train, the simulation model of train is established by Simpack software. The aerodynamic force and aerodynamic moment of high-speed train passing through bridge under crosswind are applied to the multi-body dynamics model, and the wheel-rail force is obtained. The dynamic response of the bridge under the action of wind and train is analyzed by Midas Civil cable-stayed bridge model. The results show that the train running on the cable-stayed bridge has great influence on the lateral displacement and acceleration of the bridge.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.3

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