MATEC Web Conf.
Volume 371, 2022International E-Conference on Mechanics, Mechatronics, Materials and Civil Engineering (3MCE’2022)
|Number of page(s)||6|
|Published online||30 November 2022|
Influence of the nonlinear behaviour of ballast on the dynamics of simply supported railway bridges
Department of Physics, Mechanical and Civil Engineering Laboratory, Faculty of Sciences and Technology, University Abdelmalek Essaadi, Tangier, Morocco
* Corresponding author: email@example.com
In this work, the vertical motion of a simply supported railway bridge which is subjected to the circulation of high speed trains was studied. A system consisting of two-layer beam was considered to model the dynamics of the bridge structure. The upper beam represents the rails with the sleepers and the lower beam the bridge deck. These two beams are coupled through distributed nonlinear springs that model the ballast action. The characteristics of these elements were identified from experimental measurements performed on real rail track. Considering the circulation of high speed train at given velocity, the influence of the nonlinear stiffness of the ballasted track on the response of the bridge system was analyzed. This was achieved by using the Galerkin method and the Runge-Kutta scheme to solve numerically the nonlinear partial differential equations governing the motion of the two beams. It was found that the nonlinear behaviour of the ballast affects notably the dynamics of the bridge, especially when the ballast stiffness is low. The proposed modelling enables to get more understanding regarding the vertical dynamics of ballasted track bridge in high speed line.
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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