Dynamic Amplification Factors for Railway Turnout Bearers in Switches and Crossings

Kaewunruen, Sakdirat; Ngamkhanong, Chayut; Janeliukštis, Rims; You, Ruilin

doi:10.7712/120117.5629.17734

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…More importantly, turnouts have an inherent asymmetrical topology ( Figure 1) that increases the likelihood of occurrence of unsupported bearers. Only few researches have been encountered in the literature [10,11]. They show that turnouts also suffer from voided sleepers/bearers and can amplify the contact forces up to four times high.…”

Section: Introductionmentioning

confidence: 99%

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

Hamarat

Papaelias

Silvast³

et al. 2020

Applied Sciences

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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.

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Section: Introductionmentioning

confidence: 99%

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

Hamarat

Papaelias

Silvast³

et al. 2020

Applied Sciences

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“…Kaewunruen et al. 13 , 14 analyzed the dynamic effects of railway turnout zone and illustrated that the turnout inherited topology and existence of voided sleepers increase the contact force more than four times. Lorenzo et al.…”

Section: Introductionmentioning

confidence: 99%

Determination of wheel loading reduction in railway track with unsupported sleepers and rail irregularities

Azizi

Shahravi

Zakeri

2020

Proceedings of the Institution of Mechanical Engineers, Part F:

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This study investigates the simultaneous effects of unsupported sleepers and rail random irregularities on track displacement and wheel load reduction, by means of numerical simulations with vehicle-track coupling. Vehicles are simulated as multibody systems comprising the major vehicle masses and suspension systems with nonlinear stiffness and damping. Flexible track with rail, sleeper and ballast components is considered using finite element and multibody programs. Numerical results of the simulations are in good agreement with field test measurements. Findings show that in tracks with less than four unsupported sleepers the vehicle is able to move at a speed of 110 km/h; with a higher number of unsupported sleepers the vehicle is vulnerable to derailment. The vehicle speed has no effect on the maximum rail displacement in tracks with less than four unsupported sleepers.

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Dynamic Amplification Factors for Railway Turnout Bearers in Switches and Crossings

Abstract: Abstract. Railway infrastructure is nonlinear by nature, scientifically proven by its behaviours, geometry and alignment, wheel-rail

Cited by 2 publications

References 14 publications

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

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

Determination of wheel loading reduction in railway track with unsupported sleepers and rail irregularities

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