Strength and stability of railway tracks—II Deterministic, finite element stability analysis

El-Ghazaly, H.A.; Sherbourne, Archibald N.; Arbabi, Freydoon

doi:10.1016/0045-7949(91)90070-3

Cited by 16 publications

(5 citation statements)

References 4 publications

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“…El-Ghazaly et al 14 According to the European Railway Research Institute, Van 15 uses a computer program CWERRI based on non-linear finite element model, in which the stability of CWR on plain track and bridges can be calculated in three directions. The program results show that curvature, horizontal ballast strength and misalignment of the track are the most important parameters on CWR buckling analysis.…”

Section: State Of the Artmentioning

confidence: 99%

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Methodology for evaluating thermal track buckling in dual gauge tracks with continuous welded rail

Villalba

Insa

Zuriaga

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part F:

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In the National Spanish railway network, two types of track gauge with continuous welded rails (CWR) are currently in use: the "Iberian" wide gauge (1668 mm) and the standard gauge (1435 mm). In order to improve links and freight traffic between different lines and with the rest of Europe, a dual gauge track with three rails was developed. This solution modifies the classical track configuration, so it is necessary to develop new methodologies and studies to understand its behavior. Among other loads 2 applied on a CWR track, a considerable rise in temperature induces compressive stresses in the three rails that can lead to lateral track buckling. Moreover, on dual gauge tracks the addition of the third rail increases the axial compression, which may lead to track instability. For this reason, a three-dimensional CWR model is developed in this study to be used for dual gauge track buckling analysis on straight tracks subjected to temperature load. The CWR dual gauge track model consists of beam and spring elements, in which a non-linear behaviour of the ballast is considered. The results obtained may be used to predict the buckling capacity of the CWR on dual gauge tracks with respect to different parameters such as lateral resistance, lateral imperfections, sleeper spacing or torsional stiffness.

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Section: State Of the Artmentioning

confidence: 99%

“…El-Ghazaly et al . 14 established a three-dimensional (3D) finite element model of a single beam to analyze the track under static, deterministic loads. Only a bifurcation buckling load was studied, considering ballast resistance and fastener stiffness constant.…”

Section: State Of the Artmentioning

confidence: 99%

Methodology for evaluating thermal track buckling in dual gauge tracks with continuous welded rail

Villalba

Insa

Zuriaga

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…To overcome this limitation, Hengstum and Esveld 9 and El Ghazaly et al. 10 analysed the track equilibrium under thermal loading using the 2D finite element (FE) method. For the same reason, Jackson et al.…”

Section: Introductionmentioning

confidence: 99%

On the ballast–sleeper interaction in the longitudinal and lateral directions

Iorio

Grasso

Penta

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part F:

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In service, railway tracks must withstand the transverse and longitudinal forces that are caused by running vehicles and thermal loads. The mechanical design that adopts any of the track models available in the technical literature requires that the strength of the track is fully characterised. In this paper, the results of an experimental research activity on the sleeper–ballast resistance along the lateral and the longitudinal directions are reported and discussed. In particular, the work is aimed at identifying the strength contributions offered by the base, the ballast between the sleepers, and the ballast shoulder to the global resistance of the track in the horizontal plane. These quantities were experimentally determined by means of an ad hoc system designed by the authors. Field tests were carried out on a series of track sections that were built to simulate scenarios in which the ballast was removed from the crib and/or the shoulder. The results of this study indicate that the strength percent contributions from the crib, the sleeper base, and the shoulder are, respectively, equal to about 50%, 25%, and 25% in the lateral direction, and 60%, 30%, and 10% in the longitudinal direction. Moreover, the comparison of the acquired data with literature results reveals that a detailed knowledge about the testing conditions and the activated ballast failure mechanisms is needed in order to correctly use the test data for the design purpose.

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“…However, linear eigenvalue analysis can still calculate the buckling temperature by extrapolating to reach the buckling temperature, even though the possible buckling temperature is higher than the applied temperature. It is important to note that eigen buckling analysis predicts the presence of the bifurcation point at which the primary load-deflection path is bifurcated by a secondary load-deflection path, as shown in Figure 5, and it can occur at more than one equilibrium position at this point [51,55,56]. It is noted that, after buckling, the post-buckling state does not follow the primary path.…”

Section: Linear Eigenvalue Analysismentioning

confidence: 99%

Buckling Analysis of Interspersed Railway Tracks

Ngamkhanong¹,

Wey²,

Kaewunruen³

2020

Applied Sciences

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Nowadays, timber sleepers are still used for ballasted railway tracks to carry passengers and transport goods. However, the process of natural decay causes the problem of timber sleeper degradation over time. A temporary “interspersed” approach is used to replace rotten timbers with concrete sleepers. This implementation has several inadequacies, as interspersed railway tracks have inconsistent stiffness and experience significant deterioration over the years. Increased heat due to the change in the global climate can induce a compression force in the continuous welded rail (CWR), leading to a change in track geometry called “track buckling”. A literature review shows that track buckling on plain tracks has been widely studied. However, the buckling of interspersed tracks has not been fully studied. This study presents 3D finite element modelling of interspersed railway tracks subjected to temperature change. The effect of the boundary conditions on the buckling shape is considered. The obtained results show that the interspersed approach may reduce the likelihood of track buckling. This study is the world’s first to investigate the buckling behaviour of interspersed railway tracks. The insight into interspersed railway tracks derived from this study will underpin the life cycle design, maintenance, and construction strategies related to the use of concrete sleepers as spot replacement sleepers in ageing railway track systems. The outcome of this study will help track engineers to improve the inspection of the lateral stiffness of interspersed tracks in areas prone to extreme temperature.

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Strength and stability of railway tracks—II Deterministic, finite element stability analysis

Cited by 16 publications

References 4 publications

Methodology for evaluating thermal track buckling in dual gauge tracks with continuous welded rail

Methodology for evaluating thermal track buckling in dual gauge tracks with continuous welded rail

On the ballast–sleeper interaction in the longitudinal and lateral directions

Buckling Analysis of Interspersed Railway Tracks

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