超大跨度公轨两用斜拉桥风—车—桥耦合振动研究

发布时间：2018-01-29 15:12

本文关键词： 超大跨度斜拉桥脉动风场轨道不平顺风-车-桥耦合振动动力响应　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：超大跨度斜拉桥作为与悬索桥最具竞争力的桥型,在千米级跨径上越来越受到工程界的青睐,但是随着结构的创新和跨径的增大,各种不确定性因素也显著增加。本文以国家自然科学基金项目“强风环境下高速铁路车-桥系统气动特性和抗倾覆性能风洞试验研究(51178471)”内容为主线,以主跨1092m沪通铁路长江大桥为工程背景,完成了风荷载作用下的大跨度斜拉桥与列车的耦合振动计算分析,主要工作及成果有： 1.综述了大跨度斜拉桥的发展历程,讨论了国内外铁路桥梁动力问题及列车走行性的研究进展,阐述了超大跨度斜拉桥风-车-桥耦合振动研究的必要性。 2.针对超大跨度斜拉桥的结构特点,以沪通铁路长江大桥为工程背景,建立了风-车-桥时变系统空间振动精细化仿真模型。 3.对无风状况下的多线行车方案进行计算与分析,结果表明：列车运行时,主梁跨中最大横、竖向动位移满足刚度要求,各行车方案均具有良好的动力特性及列车走行性。 4.对强风作用下的耦合系统进行计算与分析,得出了满足列车运行管制规程要求的风速-车速关系曲线,为超大跨度斜拉桥的运营管制提供了理论依据。
[Abstract]:Absrtact: as the most competitive bridge type with suspension bridge, super-span cable-stayed bridge is more and more popular in engineering circles, but with the innovation of structure and the increase of span. In this paper, the wind tunnel test study on aerodynamic characteristics and capsize resistance of high-speed railway vehicle-bridge system under strong wind environment is carried out with the National Natural Science Foundation of China (NSFC). "content is the main line. Taking the main span 1092m Shanghai-Tongtong Railway Yangtze River Bridge as the engineering background, the coupled vibration calculation and analysis of the long-span cable-stayed bridge and the train under the action of wind load are completed. The main work and results are as follows: 1. The development history of long-span cable-stayed bridge is summarized, and the research progress of railway bridge dynamic problem and train running property at home and abroad is discussed. The necessity of wind-vehicle-bridge coupling vibration of long span cable-stayed bridge is expounded. 2. In view of the structural characteristics of the super-long-span cable-stayed bridge, a fine simulation model of spatial vibration of time-varying wind-vehicle-bridge system is established with the Yangtze River Bridge on the Shanghai-Tongtong Railway as the engineering background. 3. The calculation and analysis of the multi-line train scheme under the condition of no wind shows that the maximum transverse and vertical dynamic displacement of the main beam meets the stiffness requirement when the train is running. Each train plan has good dynamic characteristics and train running performance. 4. The coupling system under the action of strong wind is calculated and analyzed, and the relationship curve between wind speed and speed is obtained to meet the requirements of train operation regulation, which provides a theoretical basis for the operation control of long-span cable-stayed bridges.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3;U448.27

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