Please use this identifier to cite or link to this item: http://repositorio.lnec.pt:8080/jspui/handle/123456789/1008552
 Title: Non-linear behaviour of geomaterials in railway tracks under different loading conditions Authors: Paixão, A.Varandas, J.Fortunato, E.Calçada, R. Keywords: Railway tracks;Resilient modulus;FEM modelling;Non-linear constitutive laws;k-\theta\ model Issue Date: Jul-2016 Publisher: Elsevier B.V. Citation: 10.1016/j.proeng.2016.06.147 Abstract: The resilient behaviour of the geomaterials used in railway tracks, particularly the ballast layer, is mostly non-linear and depends mainly on the loading stress path. However geomaterials are frequently considered as linear elastic in structural analyses, assuming that it somewhat reproduces the results of non-linear models for a given load amplitude. This study focuses on whether this consideration is adequate to simulate not only the overall track behaviour, but also the response of the ballast layer, considering different loading conditions. The authors used three-dimensional train-track-soil system models, validated with experimental data, and the results of linear-elastic models are compared against non-linear models. Although the linear elastic models required significantly lower computational effort and can provide accurate estimates of the overall track response, they strongly underestimate the stress levels inside the ballast layer. This aspect can be an important hindrance to studies using linear- elastic models to analyse resilient and plastic deformations of the ballast layer in railway tracks. URI: http://repositorio.lnec.pt:8080/jspui/handle/123456789/1008552 ISSN: 1877-7058 Appears in Collections: DT/NIT - Comunicações a congressos e artigos de revista