A Field Investigation on the Effects of Using USPs in Transition Zone From Ballasted Track to Bridges

Mottahed, Jaber; Zakeri, Jabbar Ali; Mohammadzadeh, Saeed

doi:10.1007/s40999-019-00440-3

Cited by 12 publications

(5 citation statements)

References 13 publications

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“…They proved that USPs applied at transition zones are able to reduce the ballast degradation and influence vertical stiffness of the track. Similar results were obtained by Mottahed et al [6] in the field tests on a transition zone to a railway bridge, where the ballasted track was equipped with USPs. Le Pen et al [7] performed field measurements aimed at studying the behaviour of USPs at switches and crossings.…”

Section: Introductionsupporting

confidence: 87%

Laboratory tests of pull-off strength of chosen USPs attached to concrete sleepers

2023

Archives of Civil Engineering

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Resilient under sleeper pads (USPs) are vibration isolators used in the ballasted track structure to improve the dynamic performance of the track, reduce vibrations and protect the ballast layer. Being permanently connected with the rail supports (sleepers or turnout bearers), the pads must exhibit a proper value of the pull-off strength, which ensures that they do not separate from the supports while being transported to the construction site or during many years of exploitation. This study focuses on the experimental determination of the pull-off strength of USPs attached to full scale prestressed concrete sleepers. Three variants are tested: two pads equipped with different anchor layers attached to the sleepers in the production plant and one pad glued to the sleeper in the laboratory. Some of the tested USPs are made of recycled styrene-butadiene rubber (SBR). An important part of the work is specification of the requirements for the pull-off strength of USPs, as well as the requirements for sleepers and turnout bearers equipped with resilient pads.

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Section: Introductionsupporting

confidence: 87%

Laboratory tests of pull-off strength of chosen USPs attached to concrete sleepers

2023

Archives of Civil Engineering

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“…; and Mohammadzadeh, S. A. [6], the transition from the classic track bed to bridge objects is solved using USPs effects. Numerical analysis of railway bed layers was presented by Zuada Coelho, B. and Hicks, M. [7].…”

Section: Current Status-transition Zonesmentioning

confidence: 99%

Monitoring and Expertise of Sections with a Sudden Change in Railway Track Stiffness—Transition Zones of Bridges

Hodas,

Vrchovsky,

Pultznerova

2023

Buildings

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The subject of the research is the investigation of the behavior of railway tracks in places with a significant change in the stiffness of the track. These parts can be designed from various structural elements and their materials, and this mainly results in a height change of the track level during its operation. These transition zones are monitored and expertly examined to detect undesirable deformations of the geometrical position of the track caused by the trains running. The transition zones are at the points where the fixed track transitions to the classic track bed, in our case it is their combination with bridge structures, especially at their supports. In Slovakia, under the conditions of the Railways of the Slovak Republic, the issue is topical within the framework of the modernization of trans-European railway corridors. The results of experimental measurements and their analysis will provide relevant data for subsequent research solutions for their new numerical modelling, which will ensure a smooth passage through these points of change without height fluctuations, vibrations, and shocks from the wheels of train sets.

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“…Results showed an efficient improvement in track dynamic performance with the auxiliary rail installation. Mottahed et al 15 studied the influences of implementing under sleeper pads (USPs) in the transition zone from ordinary ballasted track with lower track stiffness to railway bridges with higher track stiffness. The acceleration of the rails, when USP had been installed on bridge section as well as transition zone was 4% lower than when USP is only installed on bridge section and 35% lower than without USP.…”

Section: Introductionmentioning

confidence: 99%

The improvement of the dynamic behavior of railway bridge transition zone using furnace slag reinforcement: A numerical and experimental study

Jing

Siahkouhi

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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Transition zones between railway tracks and bridge decks can cause higher dynamic impacts. A solution is smoothly changing the track stiffness by gradually mixing steel furnace slag into the stone ballast. A nominated bridge transition zone is divided into 5 blocks of 7 meters long, with the mixing percentages of 0%, 25%, 50%, 75% and 100%. The mechanical behaviors of furnace slag-ballast combinations (FS-BCs) were studied using experiments of shear strength test, Los Angles abrasion index and plate load test. Furthermore, the dynamic behavior of bridge transition zone with FS-BCs blocks was investigated using a field validated FEM model. Results show that the 100%, 75%, 50% and 25% furnace slag by weight of ballast can increase the shear strength and ballast layer bending modulus by 13%, 12%, 9% and 7% at speed of 300 km/h compared with those of the stone ballast. The FEM study shows that rail deflections are reduced about 20%, 14%, 21% and 16% at speed of 300 km/h corresponding to 100%, 75%, 50% and 25% FS-BCs and accelerations are significantly reduced as well as increasing FS content of each block in bridge transition zone so that a smooth bridge transition zone can be achieved.

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A Field Investigation on the Effects of Using USPs in Transition Zone From Ballasted Track to Bridges

Cited by 12 publications

References 13 publications

Laboratory tests of pull-off strength of chosen USPs attached to concrete sleepers

Laboratory tests of pull-off strength of chosen USPs attached to concrete sleepers

Monitoring and Expertise of Sections with a Sudden Change in Railway Track Stiffness—Transition Zones of Bridges

The improvement of the dynamic behavior of railway bridge transition zone using furnace slag reinforcement: A numerical and experimental study

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