Non-linear elastic behaviour of unbound aggregates in FEM representing railway transition zones

J. N. Varandas, A. Paixão, E. Fortunato, P. Hölscher, R. Calçada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The stress dependent behaviour of the unbound granular materials that carry the track, and the voids that may occur between the base of the sleepers and the ballast, are the important factors for non-linear track behaviour. On transition zones, where the track stiffness may rapidly vary and often differential settlements take place between the stiff structure and the approach section of the track, these aspects are of particular relevance. Despite the non-linear constitutive behaviour of unbound aggregates, it is still common practice to consider the linear elastic behaviour for these materials in the design of transportation infrastructure. The present study focuses on the implementation of these non-linear aspects in a finite element algorithm for the dynamic simulation of railway tracks. Linear and nonlinear constitutive laws are used to reproduce the behaviour of unbound aggregates that comprise the trackbed. Stress and deformation results are presented and discussed for both linear and non-linear scenarios. The results show that the consideration of these non-linear aspects is relevant for the modelling of railway transitions.

Original languageEnglish
Title of host publicationProceedings of the Second International Conference on Railway Technology
Subtitle of host publicationResearch, Development and Maintenance
EditorsJ. Pombo, Guowei Yang
PublisherCivil-Comp Press
ISBN (Print)9781905088591
Publication statusPublished - 2014
EventRailways 2014 - The Second International Conference on Railway Technology: Research, Development and Maintenance - Ajaccio, France
Duration: 8 Apr 201411 Apr 2014
Conference number: 2nd

Publication series

NameCivil-Comp Proceedings
PublisherCivil-Comp Press
Volume104
ISSN (Print)1759-3433

Conference

ConferenceRailways 2014 - The Second International Conference on Railway Technology: Research, Development and Maintenance
Abbreviated titleRailways 2014
CountryFrance
CityAjaccio
Period8/04/1411/04/14

Keywords

  • Constitutive models
  • Non-linear
  • Railways
  • Transition zones
  • Unbound aggregates

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