Under sleeper pads in transition zones at railway underpasses: numerical modelling and experimental validation

Ribeiro, Cristina Alves; Paixão, André; Fortunato, Eduardo; Calçada, Rui

doi:10.1080/15732479.2014.970203

Cited by 53 publications

(40 citation statements)

References 15 publications

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“…To better understand the dynamic behaviour of the train-track system at the transition zone, we used a recent 2D FEM approach [13,21] that allowed to: (i) consider the relevant track components, the backfill layers, the abutment and the bridge; (ii) account for the dynamic train-track interaction using contact elements; (iii) make use of an innovative calibration procedure, as briefly explained in Section 4.2. Moreover, it uses less computational resources than full 3D models and yet accurately predicts the measurements performed in situ.…”

Section: Numerical Modellingmentioning

confidence: 99%

Transition zones to railway bridges: Track measurements and numerical modelling

Paixão

Fortunato

Calçada

2014

Engineering Structures

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a b s t r a c tRailway tracks degrade faster at transition zones to railway bridges. In modern lines, backfills with bound and unbound granular geomaterials have been used to minimize this problem. To provide insight into the behaviour of the train-track system and to fill the gap between numerical and experimental studies, the authors carried out extensive field measurements. These were then used to validate a FEM model that considers the relevant track components, earthworks and bridge; accounts for the train-track interaction using contact elements; and is very accurate in reproducing the measurements. Results showed that the backfill design fulfils its purpose in that it provides a stiffness transition from the embankment to the bridge. The dynamic component of the train-track interaction remained low. The performance of the model makes it a very useful tool to further study the railway track at critical locations, such as transition zones.

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Section: Numerical Modellingmentioning

confidence: 99%

Transition zones to railway bridges: Track measurements and numerical modelling

Paixão

Fortunato

Calçada

2014

Engineering Structures

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“…Despite the fact that the responses of unbound granular materials such as ballast, subballast, and subgrade can be more accurately modelled using nonlinear constitutive models, simplifications have to be adopted in the large-scale study (e.g., transition zones) to reduce the computational expense. Many studies (e.g., [10,[48][49][50][51][52][53]) have proved that some behaviour of ballast and hanging sleepers can be modelled accurately using simplified methods (e.g., solid elements with elastic material properties). Following [10,[48][49][50][51][52][53], the ballast and subgrade in this model are also modelled by solid elements with elastic material properties.…”

Section: Introduction Of the Finite Element Modelmentioning

confidence: 99%

“…Primary and secondary suspensions are modelled by spring-damper elements. The parameters are suggested by literature (vehicle parameters by [11,54,55], track parameter by [10,49,54,56]), and are then tuned according to field measurements [35]. The axle load of the vehicle is 19.0 t and velocity is 144 km/h.…”

Section: Introduction Of the Finite Element Modelmentioning

confidence: 99%

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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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“…The numerical model had been thoroughly calibrated and validated with field measurements in the Alcácer bypass [41,42]. The study considered the Alfa Pendular passenger trains running at 220 km/ h in the FEM analyses in numerous scenarios covering a range of track defect amplitudes up to 23.5 mm and lengths of the defects up to 35 m (Fig.…”

Section: Numerical Simulations Of the Influence Of Longitudinal Defecmentioning

confidence: 99%

A contribution for integrated analysis of railway track performance at transition zones and other discontinuities

Paixão

Fortunato

Calçada

2016

Construction and Building Materials

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Under sleeper pads in transition zones at railway underpasses: numerical modelling and experimental validation

Cited by 53 publications

References 15 publications

Transition zones to railway bridges: Track measurements and numerical modelling

Transition zones to railway bridges: Track measurements and numerical modelling

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

A contribution for integrated analysis of railway track performance at transition zones and other discontinuities

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