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J.N. Varandas¹, A. Paixão², E. Fortunato², P. Hölscher³ and R. Calçada⁴

¹CEris, ICIST, Department of Civil Engineering, Nova University of Lisbon, Portugal
²Transportation Department, National Laboratory for Civil Engineering, Lisbon, Portugal
³Geo-Engineering Department, Deltares, Delft, The Netherlands
⁴Department of Civil Engineering, Faculty of Engineering,University of Porto, Portugal

Keywords: railways, non-linear, modelling, bridge approaches, transition zo.

Abstract

At railway bridge approaches the track stiffness may vary rapidly and often differential settlements take place between the stiff structure and the approach section of the track. These differential settlements lead to uneven track profiles and the appearance of voids between the base of the sleepers and the ballast on the approach segment. The ballast and the sub-ballast are the unbound granular materials that carry the track, have a non-linear stress dependent behaviour, and degrade many times faster at transitions.

The present study focuses on the implementation of these non-linear aspects in a finite element algorithm for the dynamic simulation of a railway transition. Linear and nonlinear constitutive laws of the unbound aggregates that comprise the trackbed, and straight and uneven track profiles with hanging sleepers, are used to reproduce the behaviour of a railway bridge approach. 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.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	International Journal of Railway Technology ISSN 2049-5358 IJRT, Volume 3, Issue 4, 2014 Numerical Modelling of Railway Bridge Approaches: Influence of Soil Non-Linearity J.N. Varandas¹, A. Paixão², E. Fortunato², P. Hölscher³ and R. Calçada⁴ ¹CEris, ICIST, Department of Civil Engineering, Nova University of Lisbon, Portugal ²Transportation Department, National Laboratory for Civil Engineering, Lisbon, Portugal ³Geo-Engineering Department, Deltares, Delft, The Netherlands ⁴Department of Civil Engineering, Faculty of Engineering,University of Porto, Portugal doi:10.4203/ijrt.3.4.4 purchase the full-text of this paper Full Bibliographic Reference for this paper J.N. Varandas, A. Paixão, E. Fortunato, P. Hölscher, R. Calçada, "Numerical Modelling of Railway Bridge Approaches: Influence of Soil Non-Linearity", International Journal of Railway Technology, 3(4), 73-95, 2014. doi:10.4203/ijrt.3.4.4 Keywords: railways, non-linear, modelling, bridge approaches, transition zo. Abstract At railway bridge approaches the track stiffness may vary rapidly and often differential settlements take place between the stiff structure and the approach section of the track. These differential settlements lead to uneven track profiles and the appearance of voids between the base of the sleepers and the ballast on the approach segment. The ballast and the sub-ballast are the unbound granular materials that carry the track, have a non-linear stress dependent behaviour, and degrade many times faster at transitions. The present study focuses on the implementation of these non-linear aspects in a finite element algorithm for the dynamic simulation of a railway transition. Linear and nonlinear constitutive laws of the unbound aggregates that comprise the trackbed, and straight and uneven track profiles with hanging sleepers, are used to reproduce the behaviour of a railway bridge approach. 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. purchase the full-text of this paper (price £20) go to the previous paper return to the table of contents return to IJRT purchase this issue (price £70 +P&P)
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