Applicability of a Three-Layer Model for the Dynamic Analysis of Ballasted Railway Tracks
1
Track Systems and Development, Infrastructure, Banedanmark, DK-2450 Copenhagen, Denmark
2
Departamento de Engenharia Civil, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
3
IDMEC, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Hitoshi Tsunashima
Vibration 2021, 4(1), 151-174; https://doi.org/10.3390/vibration4010013
Received: 1 January 2021 / Revised: 22 January 2021 / Accepted: 17 February 2021 / Published: 22 February 2021
(This article belongs to the Special Issue Railway Dynamics and Maintenance)
In this paper, the three-layer model of ballasted railway track with discrete supports is analyzed to access its applicability. The model is referred as the discrete support model and abbreviated by DSM. For calibration, a 3D finite element (FE) model is created and validated by experiments. Formulas available in the literature are analyzed and new formulas for identifying parameters of the DSM are derived and validated over the range of typical track properties. These formulas are determined by fitting the results of the DSM to the 3D FE model using metaheuristic optimization. In addition, the range of applicability of the DSM is established. The new formulas are presented as a simple computational engineering tool, allowing one to calculate all the data needed for the DSM by adopting the geometrical and basic mechanical properties of the track. It is demonstrated that the currently available formulas have to be adapted to include inertial effects of the dynamically activated part of the foundation and that the contribution of the shear stiffness, being determined by ballast and foundation properties, is essential. Based on this conclusion, all similar models that neglect the shear resistance of the model and inertial properties of the foundation are unable to reproduce the deflection shape of the rail in a general way.
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Keywords:
ballasted track; structural vibrations; finite element method; discrete support model; metaheuristic optimization; numerical calibration
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MDPI and ACS Style
Rodrigues, A.F.S.; Dimitrovová, Z. Applicability of a Three-Layer Model for the Dynamic Analysis of Ballasted Railway Tracks. Vibration 2021, 4, 151-174. https://doi.org/10.3390/vibration4010013
AMA Style
Rodrigues AFS, Dimitrovová Z. Applicability of a Three-Layer Model for the Dynamic Analysis of Ballasted Railway Tracks. Vibration. 2021; 4(1):151-174. https://doi.org/10.3390/vibration4010013
Chicago/Turabian StyleRodrigues, André F.S.; Dimitrovová, Zuzana. 2021. "Applicability of a Three-Layer Model for the Dynamic Analysis of Ballasted Railway Tracks" Vibration 4, no. 1: 151-174. https://doi.org/10.3390/vibration4010013
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