Computational numerical and analytical study of the structural behavior of railway tracks with different structures
DOI:
https://doi.org/10.58922/transportes.v31i1.2848Keywords:
Railway, Railway design, Numerical Modeling, Analytical modelsAbstract
Computational models are commonly employed for structural analysis of railways, making it possible to study pavements composed by different types of materials, such as bituminous subballast (BS). On the other hand, empirical equations by Talbot et al. (1920) and Japanese National Railways (JNR) are still widely used in railway design, even though they are based on simplifying assumptions that may not faithfully represent field conditions. This paper performs a parametric study in order to evaluate the differences between the stress transmission in the infrastructure components calculated by a computational numerical model calibrated with field data and by the equations of Talbot et al. (1920) and JNR. For this, 36 permanent way configurations were studied with wheel load values and materials applied in infrastructure layers present in Brazilian railways. The behavior of the track containing a BS is also discussed. In some situations, the sleeper/ballast stresses by Talbot et al. (1920) were lower when compared to the model. In general, ballast/subballast and subballast/subgrade stresses calculated by the analytical equations were higher than the values calculated with the model, being the JNR least conservative among the equations used. The BS increased the track stiffness, reduced the vertical stresses and the deviator/confining stress ratio in the subgrade.
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Copyright (c) 2023 Paulo Pereira, Talita Alves, Rosângela Motta, Liedi Bernucci, Edson Moura
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