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Open AccessFeature PaperArticle

The Effect of Unsupported Sleepers/Bearers on Dynamic Phenomena of a Railway Turnout System under Impact Loads

1
Department of Civil Engineering, School of Engineering, The University of Birmingham, Birmingham B152TT, UK
2
School of Metallurgy and Materials, The University of Birmingham, Birmingham B152TT, UK
3
Loram Finland Oy, Yliopistonkatu 58 D, 33100 Tampere, Finland
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(7), 2320; https://doi.org/10.3390/app10072320
Received: 26 February 2020 / Revised: 23 March 2020 / Accepted: 24 March 2020 / Published: 28 March 2020
(This article belongs to the Special Issue Extreme Sciences and Engineering)
Track settlement is a common problem observed in ballasted railway tracks. The ballast bed and the material layers underneath it, deform under repeated trainloads and create uneven support conditions along the track. In some cases, the ballast settlement could be detrimental and the sleepers lose contact with the ballast bed partially or completely, resulting in higher contact forces and load distributions over the supported sleepers. Numerous studies have been conducted to investigate the phenomenon for normal tracks. Nevertheless, railway turnouts are somehow neglected. As a consequence, this study focuses on the relation between unsupported sleepers/bearers (particular name for turnouts) and a railway turnout system to develop the understanding of the response of turnout system under dynamic loadings. A 3D Finite Element Method (FEM) model is inherited from previous study and adopted to reflect the cases with unsupported bearer configurations. It is noteworthy that inherited model is capable of reflecting the impact forces, which is an inherent and fundamental characteristic of a railway turnout. Model verification is done with the parent model that was verified by field measurements. Three different support conditions (i.e., one, two, three unsupported bearers), five different velocities and six different positions of unsupported bearers are simulated. The results show that the performance of ‘fibre-reinforced foamed urethane’ (FFU) bearers are promising and more, unsupported bearers carry significant loads at particular locations, which is contrary to the sleepers on normal track that are subjected to insignificant loads. View Full-Text
Keywords: railway; turnout; switches and crossings; impact forces; unsupported sleepers; unsupported bearers railway; turnout; switches and crossings; impact forces; unsupported sleepers; unsupported bearers
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MDPI and ACS Style

Hamarat, M.; Papaelias, M.; Silvast, M.; Kaewunruen, S. The Effect of Unsupported Sleepers/Bearers on Dynamic Phenomena of a Railway Turnout System under Impact Loads. Appl. Sci. 2020, 10, 2320. https://doi.org/10.3390/app10072320

AMA Style

Hamarat M, Papaelias M, Silvast M, Kaewunruen S. The Effect of Unsupported Sleepers/Bearers on Dynamic Phenomena of a Railway Turnout System under Impact Loads. Applied Sciences. 2020; 10(7):2320. https://doi.org/10.3390/app10072320

Chicago/Turabian Style

Hamarat, Mehmet; Papaelias, Mayorkinos; Silvast, Mika; Kaewunruen, Sakdirat. 2020. "The Effect of Unsupported Sleepers/Bearers on Dynamic Phenomena of a Railway Turnout System under Impact Loads" Appl. Sci. 10, no. 7: 2320. https://doi.org/10.3390/app10072320

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