地震条件下有砟轨道空间变形特性及行车安全性分析

发布时间：2018-05-04 02:08

本文选题：地震 + 有砟轨道　；参考：《西南交通大学》2014年硕士论文

【摘要】：我国是一个地震多发国家,同时有砟轨道线路分布广泛,震区有砟轨道线路极易受到地震的危害。地震作用下,轨道结构容易产生空间弯曲变形,严重影响轨道结构的正常使用,威胁行车安全。论文针对地震条件下有砟轨道空间变形特性和震后列车行车安全性展开理论分析,主要研究内容如下：总结分析国内外关于地震对有砟轨道变形影响、有砟轨道地震反应计算方法以及地震对行车安全性影响的研究现状,提出论文研究思路、研究内容和技术路线。在对比分析不同地震反应计算方法的基础上,确定采用动力时程分析法进行有砟轨道地震变形分析,选取EL-Centro三维地震波作为输入地震波,确定地震波输入输入方法和相关参数,利用ANSYS有限元软件建立了轨道-路基三维有限元模型,确定相关模型参数。利用有限元模型分析不同地震烈度条件下扣件、轨枕、道床、路基等结构参数变化对有砟轨道结构地震条件下竖向和横向变形的影响,得到了扣件、轨枕、道床、路基等轨道结构部件参数变化对轨道结构地震变形的影响规律,为震后行车安全性分析提供了条件。确定车辆动力学安全指标,利用多体动力学理论,建立了车辆-轨道动力学分析模型,利用地震条件下有砟轨道的空间变形计算结果,分析了震后列车通过变形地段的行车安全问题,并给出了相应行车建议。
[Abstract]:China is an earthquake-prone country, and the ballasttrack track is widely distributed, so the ballasttrack track in the earthquake area is vulnerable to earthquake damage. Under earthquake action, track structure is easy to produce space bending deformation, which seriously affects the normal use of track structure and threatens the safety of driving. In this paper, the spatial deformation characteristics of ballasted track and train safety after earthquake are analyzed theoretically. The main research contents are as follows: This paper summarizes and analyzes the present research situation of the influence of earthquake on the deformation of ballasttrack, the calculation method of seismic response of ballasted track and the influence of earthquake on driving safety, and puts forward the research ideas, research contents and technical route of this paper. Based on the comparison and analysis of different seismic response calculation methods, the dynamic time-history analysis method is adopted to analyze the seismic deformation of ballasted track, and EL-Centro three-dimensional seismic wave is selected as the input seismic wave, and the input method and relevant parameters of seismic wave are determined. The three-dimensional finite element model of track-subgrade is established by using ANSYS finite element software, and the parameters of the model are determined. The influence of structural parameters such as fastener, sleeper, track bed, subgrade on vertical and lateral deformation of ballasttrack structure under different earthquake intensity is analyzed by using finite element model, and the fastener, sleeper, track bed are obtained. The influence of the variation of track structure parameters on the seismic deformation of track structure provides a condition for the analysis of post-earthquake traffic safety. The safety index of vehicle dynamics is determined, and the vehicle track dynamics analysis model is established by using the theory of multi-body dynamics. The results of spatial deformation calculation of ballasted track under seismic conditions are used. The problem of train safety in the deformed area after the earthquake is analyzed, and the corresponding operation suggestions are given.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U213.21;U298.1

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