Effects of Design Parameters on Curved Ballasted Track

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Addis Ababa University


Train and track interactions during services normally generate substantial forces on railway tracks. Such forces are transient by nature and of relatively large magnitude. There has been small literature showing of the typical responses for the loading conditions on the curved section of railway track structures, in particular, lateral and vertical loads. This paper presents a response of the curved section of a ballasted railway track structure for different parameters of track and train. In this research, the response of curved ballasted track components as a function of speed, cant and curvature is investigated using numerical modeling. Curved and straight section of ballasted railway track is modeled using the finite element approach. The paper mainly focuses on studying the effect of speed, cant as well as curvature on the values of deformation/displacement of the components of the track . Taking into account a model representing the train load, the model forms a dynamic analysis and a non-linear quasi-static analysis of track structures using Finite Element Modeling method with the use of commercially available software ABAQUS. The main results that are used to investigate the effect of speed, cant and curvature are vertical and lateral rail deflection, vertical and lateral sleeper displacement and vertical and lateral subgrade displacement Hertz analytical method was used to assess the axle load and train speed effect based on the results of calculated contact pressure and penetration depths for a selected straight section where the half-space assumption is valid. Results show that with increasing train speed track deflection grow higher. It is observed that, for example, in a long-term the outer rail response for a 350 meter radius ballasted track there is 0.3536 mm lateral deflection increase for every Km/hr increase of train speed. It is recommended to do a feed-back loop for the long-term behavior of the track.



Sleeper displacement, curved track section, rail deflection, subgrade displacement, speed, cant, curvature