The influence of dynamic loading and thermal conditions on tram track slab damage resulting from subgrade differential settlement

Shan, Yao; Wang, Binglong; Zhang, Jiawei; Zhou, Shunhua

doi:10.1016/j.engfailanal.2021.105610

Cited by 28 publications

(2 citation statements)

References 32 publications

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“…In [24], the vertical interaction between a track and a bridge was investigated. Moreover, the influence of dynamic train loads and temperature variations in the damage state of a tram ballastless track was studied in [25]. In [26], the mechanical response of the different substructure layers was evaluated using a rheological model of the track substructure, including plasticity (i.e., slider elements).…”

Section: Introductionmentioning

confidence: 99%

An Efficient Numerical Model to Predict the Mechanical Response of a Railway Track in the Low-Frequency Range

et al. 2022

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With railway interoperability, new trains are allowed to move on the French railway network. These trains may present different designs from standard trains. This work aims to complete the current approach for vehicle admission on the railway network, which is defined in technical baselines. Historically, computation rules for traffic conditions are based on simplified analytical works, which are considerably qualitative. They have evolved through feedback and experimental campaigns to comply with the track structure evolution. An efficient methodology based on numerical simulation is needed to evaluate railway vehicle admission to answer this issue. A perspective to update these computation rules is to evaluate the structural fatigue in the rail. That is to say, fatigue is caused by bending and shear stresses. The complexity of the railway system has led to an investigation at first of the vertical response of the railway track and quantifying its contribution to the rail’s stress response. In that sense, this paper investigates the vertical track response to a moving railway vehicle at low frequencies. For this purpose, a lightweight numerical model for the track, a multi-body model for the vehicle, and a random vertical track irregularity are proposed. More explicitly, the track model consists of a two-layer discrete support model in which the rail is considered as a beam and sleepers are point masses. The rail pads and ballast layer are modelled as spring/damper couples. Numerical results show a negligible effect of track inertia forces due to high track stiffness and damping. Nevertheless, this assumption is valid for normal rail stresses but not for ballast loading, especially in the case of sleeper voids or unsupported sleepers. Hence, the prediction of the mechanical stress state in the rail for fatigue issues is achieved through a static track model where the equivalent loading is obtained from a dynamic study of a simplified vehicle model. A statistical analysis shows that the variability of the vertical track irregularity does not influence the output variabilities like the maximum in time and space of the normal and shear stress.

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Section: Introductionmentioning

confidence: 99%

An Efficient Numerical Model to Predict the Mechanical Response of a Railway Track in the Low-Frequency Range

et al. 2022

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“…Some numerical simulation research for the effect of subgrade diseases on track geometry and safe operation of HSR has been performed (Nielsen and Li, 2018;Shan et al, 2020Shan et al, , 2021Varandas et al, 2020). Jiang et al (2019) studied the mapping relationship of subgrade differential settlement and track by building a 3D finite element model (FEM), which was validated with a full-scale physical model testing.…”

Section: Introductionmentioning

confidence: 99%

Spatial mapping relationship model of subgrade disease and track geometry for high-Speed railway

Zhong

Zhang

2022

Advances in Structural Engineering

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A highly efficient and accurate mapping relationship model of subgrade disease and track geometry is significant for determining criterion of subgrade deformation and evaluating operation safety of High-speed Railway. In this paper, an innovative spatial mapping relationship model (SMRM) is proposed for describing track spatial geometry under subgrade disease of differential settlement and frost heave. Starting from analysing the theoretical interaction mechanism between subgrade and ballastless track, and presenting the flowchart of SMRM and its implementation process are described in detail. The good accuracy and applicability of SMRM method is verified based on the finite element model (FEM) and scale model experiment. The results indicate that it can better simulate the spatial characteristic of above mapping relationship than traditional theoretical model and avoid complicated and time-consuming FEM analysis process. It has high accuracy and reliability for the most application scenarios. The proposed method also can analyse the influences of others’ diseases on track geometry as long as the disease description function is available.

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Dynamic Analysis of Slab Track with Crack Considering Rail Corrugation

Yang,

Liu,

Wang

et al. 2023

KSCE J Civ Eng

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The influence of dynamic loading and thermal conditions on tram track slab damage resulting from subgrade differential settlement

Cited by 28 publications

References 32 publications

An Efficient Numerical Model to Predict the Mechanical Response of a Railway Track in the Low-Frequency Range

An Efficient Numerical Model to Predict the Mechanical Response of a Railway Track in the Low-Frequency Range

Spatial mapping relationship model of subgrade disease and track geometry for high-Speed railway

Dynamic Analysis of Slab Track with Crack Considering Rail Corrugation

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