Field and numerical investigation of the effect of under-sleeper pads on the dynamic behavior of railway bridges

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

doi:10.1177/0954409718764027

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…In addition to mechanical loading and performance aspects, such as the structural rigidity and contact force below crosstie, dynamic behavior trends including vibration velocity and acceleration are used for track evaluation. Excessive vibrations usually indicate undesired track conditions such as the effects of a hanging crosstie, ballast non-uniform support conditions, or ballast fouling ( 16, 31–35 ). Investigating crosstie vibration velocity can bring insights on the implications of ballast degradation to track performance.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…velocity and acceleration are used for track evaluation. Excessive vibrations usually indicate undesired track conditions such as the effects of a hanging crosstie, ballast non-uniform support conditions, or ballast fouling(16,(31)(32)(33)(34)(35). Investigating crosstie vibration velocity can bring insights on the implications of ballast degradation to track performance.…”

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confidence: 99%

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Effect of Ballast Degradation on Track Dynamic Behavior Using Discrete Element Modeling

Liu

Feng

Tutumluer

2022

Transportation Research Record: Journal of the Transportation R

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Ballast degradation refers to the traffic use of in-service track when aggregate particles become smaller in size and fines are generated because of particle breakage and abrasion to cause geometry defects and influence the serviceability of ballasted track affecting train operations. To evaluate effects of ballast degradation on track substructure maintenance needs, single crosstie models were developed to simulate new and degraded ballast behavior under train loading. Particle size distributions and shape properties of the new and degraded ballast materials studied were adopted from previous laboratory tests conducted at the University of Illinois, U.S. Crosstie vibrations, ballast particle contact force distributions and particle rotations, and localized contact force chain networks were compared among different single crosstie models incorporating new and degraded ballast. The following key observations were made based on the simulation results: (1) crosstie on degraded ballast exhibits larger vibrations and more inconsistent vibration patterns; (2) degraded ballast shows a higher number of localized force chains with more particle contacts while the characteristic trend observed for new ballast is the presence of more symmetric force chain networks, which might be attributed to the new ballast layer’s uniform gradation and good interlock; (3) average normal contact forces are distributed more uniformly in new ballast in both horizontal and vertical directions as opposed to these forces concentrated more in vertical direction in degraded ballast; and (4) more ballast particles experience large rotations in degraded ballast and the related impact zone, which encloses all particles with large rotations, is also broader and deeper.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Effect of Ballast Degradation on Track Dynamic Behavior Using Discrete Element Modeling

Liu

Feng

Tutumluer

2022

Transportation Research Record: Journal of the Transportation R

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“…In general, a railway track often experiences impact loading, which is a shock load applied in short duration [2,35]. The use of USPs for attenuating impact load and excessive vibration has been studied in the fields at specific locations such as dipped rails/welds, glue insulated joint etc [37][38][39][40][41][42][43][44][45]. However, the numerical studies into such behaviour have been limited and not fully investigated.…”

Section: Reduction Of Groundborne Vibration ✔ ✔mentioning

confidence: 99%

Effects of under sleeper pads on dynamic responses of railway prestressed concrete sleepers subjected to high intensity impact loads

Ngamkhanong

Kaewunruen

2020

Engineering Structures

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From Material to Field Test: An Improved Under Sleeper Pad Model

Ulu,

Metin,

Arikoglu

et al. 2024

Arab J Sci Eng

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This study aims to determine the stiffness values of under sleeper pad (USP) and rail pad (RP) components to reduce the high-amplitude vibrations that occur in the transition zones of some specific structures such as viaducts in ballasted railways. The conventional method of simulating USPs and RPs as spring–dashpot elements in the Kelvin–Voigt model is inadequate due to the absence of frequency and temperature dependencies in the model. The study proposes a new analytical model that considers USPs and RPs as viscoelastic (VE) materials and integrates them into the ballasted railway superstructure model by adding unit masses avoiding mathematical singularity. The process includes material testing, field measurements, and validation of the proposed model with finite element model analysis. The effect of ambient temperature and material modelling on the superstructure’s dynamic response in the frequency domain is analysed in detail. To account for VE behaviours of the resilient elements, the generalised Maxwell model (GMM) is chosen via unit mass implementation compared to other VE models. The obtained results show that the dynamic response of the railway superstructure is 8–10 times sensitive to temperature variation. This demonstrates how important it is to include the temperature-dependent dynamics of the elastomer material in the model. According to the other results that were obtained, the use of USP in transition zones does not solve the vibration problem radically. Bridge dynamic responses are also sensitive to the mass of the bridge rather than its stiffness.

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Field and numerical investigation of the effect of under-sleeper pads on the dynamic behavior of railway bridges

Cited by 9 publications

References 6 publications

Effect of Ballast Degradation on Track Dynamic Behavior Using Discrete Element Modeling

Effect of Ballast Degradation on Track Dynamic Behavior Using Discrete Element Modeling

Effects of under sleeper pads on dynamic responses of railway prestressed concrete sleepers subjected to high intensity impact loads

From Material to Field Test: An Improved Under Sleeper Pad Model

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