Influence of different transition zones on the dynamic response of track–subgrade systems

Shan, Yao; Albers, Bettina; Savidis, Stavros A.

doi:10.1016/j.compgeo.2012.09.006

Cited by 106 publications

(45 citation statements)

References 7 publications

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“…Insa et al (2012) investigated the effect of under sleeper pads in the transition zone adjacent to the bridges. Shan et al (2013) investigated the transition zone behavior located on the embankment adjacent to the bridges. In this study, two types of transition zones, including inverted trapezoid section and two-part transition section, were evaluated by 3D modeling using ANSYS software.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Influence of Auxiliary Rails on Dynamic Behavior of Railway Transition Zone by a 3D Train-Track Interaction Model

Heydari-Noghabi

Varandas

Esmaeili

et al. 2017

Lat. Am. j. solids struct.

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Abrupt track vertical stiffness variations along railway tracks can lead to increased dynamic loads, asymmetric deformations, damaged track components, and consequently, increased maintenance costs. The junction of slab track and ballasted track is one of the existing areas where vertical track stiffness can suddenly change, therefore requiring a transition zone that smoothes the track stiffness change. One of the methods for constructing the transition zone at the junction of slab and ballasted tracks is to install auxiliary rails along the transition zone. In the present study, the dynamic behavior of this type of transition zone was evaluated by a train-track interaction model. For this purpose, a 3D model of the railway track was made, representing the slab track, the transition zone, and the ballasted track. Then, the modeling results were validated by the results of field tests. Afterwards, in order to study the dynamic behavior of the transition zone with auxiliary rails, different sensitive analyses, such as vehicle speed, vehicle load, number of auxiliary rails and railpad stiffness, were performed with the model. The obtained results showed that the use of auxiliary rails reduced the rail deflection variations along the transition zone from 35% to 28% for low and medium speeds (120, 160, 200 km/h), and from 40% to 33% for high speeds (250, 300 km/h). KeywordsRailway track, transition zone of slab track to ballasted track, auxiliary rails, 3D train-track interaction model.

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Section: Introductionmentioning

confidence: 99%

Investigating the Influence of Auxiliary Rails on Dynamic Behavior of Railway Transition Zone by a 3D Train-Track Interaction Model

Heydari-Noghabi

Varandas

Esmaeili

et al. 2017

Lat. Am. j. solids struct.

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“…However, since the objective of this research is the study of the static and dynamic behavior of the transitions, it is only considered the effect of the incremented quasi-static load which will allow the assessment of the proposed scenarios in a simple manner and with enough accuracy. As pointed by Shan et al (2013), this simplification that does not attend the vehicle-track interaction is not totally representative of the real dynamic behavior and becomes a major limitation of the model. Nevertheless, the high level of detail of the track 3D FEM model is more realistic than those characteristic of the vehicle-track coupled models where the different track components and the soil are represented by spring-damper systems.…”

Section: Finite Elements Model Of the Studied Trackmentioning

confidence: 98%

Static and dynamic behavior of transitions between different railway track typologies

Real

Zamorano²,

Hernandez

et al. 2015

KSCE J Civ Eng

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A railway track stretch comprising three different track typologies (i.e., ballasted track, asphalt slab track and concrete slab track) has been modeled using a three-dimensional Finite Elements model, which has been calibrated and validated using real acceleration records. In this model, two different analyses have been run: a static analysis to assess the stiffness evolution and a dynamic analysis to calculate the accelerations induced by the train loads along the transition zones. These analyses have been used to assess the performance of three different techniques existing in the literature to improve the structural behavior of the track in the transition areas: the variation of the stiffness of the elastomers, the implementation of additional rails and the use of resilient mats. Results have demonstrated that these techniques perform generally better in the track vertical stiffness transition between the concrete and asphalt slab tracks while the dynamic response is not significantly altered in any scenario.

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“…Finite element method has been used to demonstrate the appropriate vertical behavior, as in previous investigations López 2009, Shan, Albers andSavidis 2013). Eight different cases have been developed depending on the H parameter and the type of wedge analyzed.…”

Section: Discussionmentioning

confidence: 99%

“…An elastic, isotropic and lineal model has been assumed to characterize the rails, elastic pads, sleepers, common granular material, granular material treated with cement and soil material (Gallego and López 2009, Shan, Albers and Savidis 2013, Real et al 2014. The material parameters used in the models are shown in Table 2.…”

Section: Numerical Modelmentioning

confidence: 99%

New Transition Wedge Design Composed by Prefabricated Reinforced Concrete Slabs

Real

Zamorano-Martín²,

Real-Herráiz

et al. 2016

Lat. Am. j. solids struct.

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Important track degradation occurs in structure-embankment transitions, in which an abrupt change in track vertical stiffness arises, leading to a reduction in passengers comfort and safety. Although granular wedges are suggested by different railroad administrations as a solution to avoid these problems, they present some disadvantages which may affect track long-term performance. In this paper, a new solution designed with prefabricated reinforced concrete slabs is proposed. The aim of this solution is to guarantee a continuous and gradual track vertical stiffness transition in the vicinity of structures, overcoming granular wedges disadvantages. The aim of this study is to assess the performance of the novel wedge design by means of a 3-D FEM model and to compare it with the current solution.

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Influence of different transition zones on the dynamic response of track–subgrade systems

Cited by 106 publications

References 7 publications

Investigating the Influence of Auxiliary Rails on Dynamic Behavior of Railway Transition Zone by a 3D Train-Track Interaction Model

Investigating the Influence of Auxiliary Rails on Dynamic Behavior of Railway Transition Zone by a 3D Train-Track Interaction Model

Static and dynamic behavior of transitions between different railway track typologies

New Transition Wedge Design Composed by Prefabricated Reinforced Concrete Slabs

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