Track transitions in railways: A review

Sañudo, Roberto; dell’Olio, Luigi; Casado, Julio; Carrascal, I.; Diego, Soraya

doi:10.1016/j.conbuildmat.2016.02.084

Cited by 118 publications

(78 citation statements)

References 24 publications

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“…A thorough review can be found in [26]. The geotechnical factor has been studied less, which is mainly due to the limitations of measurement methods.…”

Section: Introduction Of Transition Zonesmentioning

confidence: 99%

Analysis of the Dynamic Wheel Loads in Railway Transition Zones Considering the Moisture Condition of the Ballast and Subballast

Wang

Silvast²,

Markine

et al. 2017

Applied Sciences

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Transition zones in railway tracks are the locations with considerable changes in vertical support structures, e.g., near bridges. Due to possible water flow constrictions in transition zone structures, there is frequently an increased moisture level in the ballast/subballast layers, which is a potential source of track degradation. This paper presents results of the moisture condition measured in three transition zones using ground penetrating radar, where the ballast/subballast are analyzed. The relationship between the moisture condition and track degradation in the transition zones is studied by comparing it to the longitudinal track level that is measured by the track inspection coaches. A strong connection is found between the high moisture condition and track degradation in the transition zones. The dynamic behavior of the transition zones with high moisture condition is analyzed using the Finite Element method. Differential stiffness and settlement are taken into consideration in the transition zone model, which is also coupled with a vehicle. The ballast/subballast layers are modelled as solid elements. Increased moisture conditions are considered as a reduction of elastic modulus, according to laboratory findings. Results show that high moisture leads to an increase of dynamic wheel loads in the transition zone, which explains the connection and confirms that the high moisture condition is a source of transition zone problems.

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“…A thorough review can be found in [26]. The geotechnical factor has been studied less, which is mainly due to the limitations of measurement methods.…”

Section: Introduction Of Transition Zonesmentioning

confidence: 99%

Analysis of the Dynamic Wheel Loads in Railway Transition Zones Considering the Moisture Condition of the Ballast and Subballast

Wang

Silvast²,

Markine

et al. 2017

Applied Sciences

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“…It should be pointed out that depending on the direction of the train, the transition may take place from a softer to a stiffer section (when entering the structure) or from a stiffer to a softer track section (when leaving the structure). The effect of train direction on the performance of stiffness transitions has already been studied by several authors such as [2,15]. In this investigation, both types of transitions have been considered and their vibratory response is shown in Fig.…”

Section: Vibrations In the Trackmentioning

confidence: 99%

“…According to [1,2], the most common issues in transition zones (e.g., safety, passenger comfort, and maintenance expense problems) generally arise from differential settlements between adjacent cross-sections of track. Furthermore, such elevation change induces a vertical acceleration of the vehicle mass, which generates an increase in the wheel-rail interaction forces [3].…”

Section: Introductionmentioning

confidence: 99%

Dynamic behaviour of a novel transition wedge composed by prefabricated reinforced concrete slabs

Labrado-Palomo¹,

Morales-Ivorra²,

Ribes-Llario³

et al. 2017

J. vibroeng.

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Abrupt variations of track stiffness in transitions from conventional to slab track, e.g., over bridges and tunnels, usually lead to passenger discomfort, vehicle and track damage and even safety issues. Therefore, to minimize this negative effect, it is very convenient to smooth the stiffness changes in such transitions; and wedges arise as a very effective technique. Although granular wedges are commonly suggested by railroad managers as a solution, this typology presents some disadvantages, e.g., high construction time and costs, that should be addressed. In this paper, a new solution based on prefabricated, reinforced concrete slabs is presented and its dynamical performance is assessed by means of a 3D FEM model. Results indicate that track vibrations both on the rail and over a sleeper are considerably reduced when the new slab-based wedge is considered instead of a traditional granular wedge.

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“…A novel approach to anticipating poor track performance was presented by Paixao et al, 10 in terms of derailment risk, track degradation, and passengers comfort, at critical locations of railway lines, such as transition zones and other discontinuities, including local irregularities, which could provide crucial information for railway infrastructure managers. As a conclusion, San˜udo et al 11 summarized the main problems and alternative solutions for TTSs in their review work. Although the above studies have proposed many valuable suggestions on optimizing the design and reducing the vibration of TTSs, few scholars paid attention to the dynamic behaviors of fasteners in TTS, which should be carefully concerned to ensure the operation safety.…”

Section: Introductionmentioning

confidence: 97%

Dynamic evaluation of elastic bar in track transition section of fast-metro system

Chen

Fang

2019

Advances in Mechanical Engineering

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In China, the rapid development of fast-metro system, along with many dynamic problems in track transition section, threatens the safe operation of the metro system. Aiming at this practical issue, this article presents an evaluation on the dynamic behaviors of elastic bars in track transition section of the fast-metro system. Primarily, an effective global–local method for evaluating the performance of elastic bar is proposed based on vehicle–track-coupled dynamics, in which two important models are established, namely, the vehicle–track transition section–coupled dynamic model and the three-dimensional finite element model of elastic bar. Then, the dynamic property of elastic bar in track transition section of the fast-metro system is evaluated employing the proposed method, focusing on the fastener force, dynamic displacement of elastic bar, and stress of elastic bar. Finally, fatigue analysis is conducted to evaluate the service life of elastic bar in track transition section. Results show that the proposed global–local method is effective to evaluate the dynamic behaviors of elastic bar in track transition section in fast-metro system. Impact appears when vehicles run through the track transition section and it mainly influences the two fasteners on each side. Operational direction of vehicle has little influence on amplitude of displacement of elastic bar. When the vehicle runs at 120 km/h, maximum stress of elastic bar is 1050 MPa, which occurs inside the rear toe. From the perspective of long-term service, traditional track transition section is not suitable for fast-metro system, which should be redesigned.

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Track transitions in railways: A review

Cited by 118 publications

References 24 publications

Analysis of the Dynamic Wheel Loads in Railway Transition Zones Considering the Moisture Condition of the Ballast and Subballast

Analysis of the Dynamic Wheel Loads in Railway Transition Zones Considering the Moisture Condition of the Ballast and Subballast

Dynamic behaviour of a novel transition wedge composed by prefabricated reinforced concrete slabs

Dynamic evaluation of elastic bar in track transition section of fast-metro system

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