Nonlinear Modelling and Analysis of Moving Train Loads on Interspersed Railway Tracks

Kaewunruen, Sakdirat; Lewandrowski, Tomasz; Chamniprasart, Kritditorn

doi:10.7712/120117.5628.17733

Cited by 8 publications

(15 citation statements)

References 10 publications

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“…These are also significant factors that can accelerate track degradation. [26][27][28], time-dependent behaviour have not been fully studied and taken into account. This study aims at investigating the dynamic responses of the interspersed railway tracks in three-dimensional space considering the influences of time-dependent degradation of materials.…”

Section: Introductionmentioning

confidence: 99%

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Influence of time-dependent material degradation on life cycle serviceability of interspersed railway tracks due to moving train loads

Kaewunruen

Ngamkhanong

2019

Engineering Structures

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Presently, timber-sleepered tracks are still being adopted in railway networks transporting goods and passengers. However, the deterioration of timber sleepers is evident after years of service due to natural decay; and it is difficult to seek cost-effective hardwood sleepers to replace the aging sleepers. An impermanent "interspersed" approach is an alternative method used to substitute rotten timbers with concrete sleepers. Although the interspersed tracks offer a cost-effective short-term solution for certain track classes, there are some drawbacks to this practice, since the interspersed track has inconsistent stiffness problems, and the different track decay rate can cause uneven settlement and foundation failure, which can lead to significant track deterioration over time. The emphasis of this study is placed on the long-term behaviour of interspersed track components under repeated train loading. Interspersed track models in three-dimensional space have been developed and validated using a finite element method. The effects of deteriorated railway components (timber, rail pads, ballast) are taken into account to examine the dynamic performance of the interspersed tracks under moving train loads. This study will help rail track engineers better understand the time-dependent behaviour of interspersed tracks, enable a truly predictive track maintenance and improve the reliability of infrastructure asset maintenance and life cycle management.

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Section: Introductionmentioning

confidence: 99%

“…All four types of interspersed railway tracks have been constructed previously using finite element software package, STRAND7 [29]. Validations were carried out earlier against experimental and laboratory data [26][27][28]. It is noted that this study considers the dynamic responses of interspersed track from year 0 to 20.…”

Section: Introductionmentioning

confidence: 99%

Influence of time-dependent material degradation on life cycle serviceability of interspersed railway tracks due to moving train loads

Kaewunruen

Ngamkhanong

2019

Engineering Structures

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“…Four separated forces with various magnitudes have been used to simulate the load condition of a passenger train bogie (2 per each rail, 2 m apart). This load magnitude has been used for benchmarking purpose [14,15]. The nondimensional analyses have been carried out to investigate the dynamic amplification over curve radii and frequency domain.…”

Section: Track Modelmentioning

confidence: 99%

Nonlinear Dynamic of Curved Railway Tracks in Three-Dimensional Space

Liu

Ngamkhanong

Kaewunruen

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. On curved tracks, high-pitch noise pollution can often be a considerable concern of rail asset owners, commuters, and people living or working along the rail corridor. Inevitably, wheel/rail interface can cause a traveling source of sound and vibration, which spread over a long distance of rail network. The sound and vibration can be in various forms and spectra. The undesirable sound and vibration on curves is often called 'noise,' includes flanging and squealing noises. This paper focuses on the squeal noise phenomena on curved tracks located in urban environments. It highlights the effect of curve radii on lateral track dynamics. It is important to note that rail freight curve noises, especially for curve squeals, can be observed almost everywhere and every type of track structures. The most pressing noise appears at sharper curved tracks where excessive lateral wheel/rail dynamics resonate with falling friction states, generating a tonal noise problem, so-call 'squeal'. Many researchers have carried out measurements and simulations to understand the actual root causes of the squeal noise. Most researchers believe that wheel resonance over falling friction is the main cause, whilst a few others think that dynamic mode coupling of wheel and rail may also cause the squeal. Therefore, this paper is devoted to systems thinking the approach and dynamic assessment in resolving railway curve noise problems. The simulations of railway tracks with different curve radii will be carried out to develop state-of-the-art understanding into lateral track dynamics, including rail dynamics, cant dynamics, gauge dynamics and overall track responses.

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“…It is clear that the long-term performance of interspersed tracks can be impaired. Studies of interspersed tracks have been carried out [18][19][20][21]. Moving train loads were applied to interspersed tracks to study the vertical dynamic responses.…”

Section: Introductionmentioning

confidence: 99%

“…All four types of interspersed railway tracks were constructed previously, and their results are compared to those of a plain concrete track. The original model was validated previously using track vertical response under train loads against the laboratory data and against experimental and multibody train track simulation results [18][19][20]. The model was extended for buckling analysis and validated against analytical solutions.…”

Section: Introductionmentioning

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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Nonlinear Modelling and Analysis of Moving Train Loads on Interspersed Railway Tracks

Abstract: Abstract. The interspersed pattern sleeper of railway track, which is a replacement of old

Cited by 8 publications

References 10 publications

Influence of time-dependent material degradation on life cycle serviceability of interspersed railway tracks due to moving train loads

Influence of time-dependent material degradation on life cycle serviceability of interspersed railway tracks due to moving train loads

Nonlinear Dynamic of Curved Railway Tracks in Three-Dimensional Space

Buckling Analysis of Interspersed Railway Tracks

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