有轨电车路基段纵向轨枕轨道结构受力特性及优化研究

发布时间：2018-01-01 23:20

本文关键词：有轨电车路基段纵向轨枕轨道结构受力特性及优化研究　出处：《西南交通大学》2016年硕士论文　论文类型：学位论文

【摘要】：有轨电车路基上纵向轨枕轨道结构是一种新型的钢轨嵌入式轨道结构,具有结构高度小、施工方便、平顺性高等优点,目前尚未在国内大规模应用。本文总结了有轨电车轨道结构的发展及研究情况,根据路基上共用路权纵向轨枕轨道结构的特点,建立了结构的力学分析模型和有限元计算模型,并对各项荷载作用下轨道结构的受力特性和结构尺寸参数的取值进行了研究。主要研究内容及成果包括：(1)分析了3种有轨电车荷载工况,得出有轨电车荷载作用下的轨道结构纵横向应力、弯矩极值,其中纵向负弯矩达到纵向正弯矩的一半左右；分析了4种汽车荷载工况,得出汽车荷载作用下轨道结构的纵横向弯矩和路基面最大变形值均大于列车荷载工况,主要是由于考虑了板角汽车荷载所致。(2)正温度梯度作用时,在自重、钢轨和板中列车荷载的共同约束下,道床板的最大纵向翘曲应力和横向翘曲应力分别达到完全约束条件下的66%、17%；负温度梯度作用时,考虑板中列车荷载和板端列车荷载的约束,得出不同约束工况下的道床板最大纵向翘曲应力和横向翘曲应力分别达到完全约束条件下的70%、15%;20mm/20m半波正弦不均匀沉降曲线作用时,基于弹性基础有限元法计算的轨道结构附加纵弯矩最大值为刚性基础法简化计算结果的59%。(3)从减小轨道结构受力、变形和节省成本的角度出发,考虑列车荷载、温度梯度、基础不均匀变形的作用,对道床板厚度和轨道结构单元长度的合理取值范围进行了研究,提出道床板厚度宜取值0.15m-0.18m,结构单元长度宜取值5m-6m。
[Abstract]:The longitudinal sleeper track structure on the tramcar roadbed is a new type of rail embedded track structure, which has the advantages of small structure height, convenient construction, high ride comfort and so on. This paper summarizes the development and research situation of the tram track structure, according to the characteristics of the common right longitudinal sleeper track structure on the roadbed. The mechanical analysis model and finite element calculation model of the structure are established. The stress characteristics of track structure and the selection of structural dimension parameters under various loads are studied. The main research contents and results include: 1) the load conditions of three kinds of trams are analyzed. The longitudinal and transverse stress and bending moment extremum of track structure under tram load are obtained, in which the longitudinal negative moment is about half of the longitudinal positive moment. The results show that the longitudinal and transverse bending moment of track structure and the maximum deformation of roadbed are all larger than those of train load. It is mainly due to the consideration of the plate angle vehicle load caused by the positive temperature gradient, under the constraints of self-weight, rail and train load in the plate. The maximum longitudinal warping stress and transverse warping stress of the bed plate are 6617 and 6617, respectively. When the temperature gradient is negative, the train load in the plate and the train load at the end of the plate are taken into account. The maximum longitudinal warping stress and transverse warping stress of the pavement slab under different confined conditions are 70 / 15 respectively under the condition of complete restraint. When the sinusoidal inhomogeneous settlement curve of 20mm / 20m half-wave is acted on. The maximum value of additional longitudinal moment of track structure calculated by finite element method based on elastic foundation is 59th of the simplified calculation result of rigid foundation method) from the point of view of reducing the stress deformation and saving cost of track structure. Considering the effect of train load, temperature gradient and uneven deformation of foundation, the reasonable value range of the thickness of track bed and the length of track structure unit is studied. It is suggested that the thickness of bed plate should be 0.15m-0.18m, and the length of structural unit should be 5m-6m.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U492.433;U213.2

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