Dynamic comparison of different types of slab track and ballasted track using a flexible track model

Blanco-Lorenzo, Julio; Santamaría, Javier; Vadillo, E.G.; Oyarzabal, O.

doi:10.1177/0954409711401516

Cited by 42 publications

(23 citation statements)

References 18 publications

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“…Li et al [8] described the typical static dead load ranges for each track component; rails weighted from about 45 kg/m to 75 kg/m, timber tie weighted about 110 kg and concrete tie weighted 360 kg. They described the typical track substructure density for ballast (1760 kg/m 3 ), sub ballast (1920 kg/m 3 ) and subgrade (2240 kg/m 3 ).…”

Section: Applied Axial Stressmentioning

confidence: 99%

“…The ballasted tracks have the majority usage in the world due to their low cost, besides, the greater gained experience compared to new ballastless tracks [7]. Ballasted tracks have been used in the beginning of railways and ballastless tracks have been introduced in 1960s [8]. A ballasted track consists of two main structures: superstructure and substructure [9].…”

Section: Introductionmentioning

confidence: 99%

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Large-scale triaxial and box testing on railroad ballast: a review

Alabbasi

Hussein

2019

SN Appl. Sci.

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The use of railway transportation systems has been increased throughout the years. The conventional ballasted tracks have been used widely in many countries around the world. Ballast material is the basic element of ballasted tracks. Ballast degrades and deforms after service. Therefore, periodical ballast maintenance is needed which is a cost and time expensive activity. Understanding ballast mechanical behavior leads to better design and efficient maintenance. From the literature, experimental approach is used to understand the mechanical behavior of railroad ballast. Traditional experimental tests provide inaccurate results due to the large ballast particle size with relative to sample size. Researchers used large scale triaxial and box tests extensively to understand the mechanical behavior of railroad ballast. The target of this paper is to present a concise review of the extensive literature presented on the mechanical behavior of railroad ballast using large scale triaxial and box testing. It discusses the various aspects of large-scale equipment such as apparatus' setup , size, material and shape, simulated load condition and test purpose. It presents the key findings of the large-scale triaxial and box tests in understanding ballast mechanical behavior.

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Section: Applied Axial Stressmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Large-scale triaxial and box testing on railroad ballast: a review

Alabbasi

Hussein

2019

SN Appl. Sci.

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“…The main parameters for the vehicle subsystem are listed in Table 1. (2) The track subsystem was simplified as continuous elastic discrete support beam-shell FEM model [20,21]. In the track subsystem, rail was supported by a series of discrete spring/damper elements which acted as fasteners [22]; track slab and concrete roadbed were both modeled as shell which was supported in a continuous manner; CA mortar under the…”

Section: Vehicle-track Vertical Coupled Dynamicmentioning

confidence: 99%

Contact Loss beneath Track Slab Caused by Deteriorated Cement Emulsified Asphalt Mortar: Dynamic Characteristics of Vehicle-Slab Track System and Prototype Experiment

Liu

Ren

et al. 2016

Mathematical Problems in Engineering

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The contact loss beneath track slab caused by deteriorated cement emulsified asphalt mortar (CA mortar) has been one of the main diseases occurring in the CRTS- (China Railway Track System-) I Slab Track of high-speed railway in China. Based on the slab track design theory and the vehicle-track coupling vibration theory, a vehicle-track vertical coupling dynamic FEM model was established to analyze the influence of the contact loss length on the dynamic characteristics of vehicle and track subsystems at different train speeds. A prototype dynamic characteristic experimental test of CRTS-I Slab Track with CA mortar contact loss was conducted to verify the FEM model results. The train load was generated by the customized ZSS50 excitation car. The results showed that when the operation speed is less than 300 km/h, the contact loss with length smaller than 2.0 m barely affects the running smoothness ride safety of vehicle. The contact loss length effect on the dynamic characteristics of track subsystem is pronounced, especially on the track slab. Once the contact loss beneath the track slab occurs, the vibration displacement and the acceleration of the track slab increase rapidly, while it has little influence on the displacement and acceleration of the concrete roadbed.

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“…There are two types of railway tracks; ballasted and ballast less tracks. The Ballasted tracks have been used in the beginning of railways and ballast less tracks have been introduced in 1960s [1]. The ballasted tracks have the majority usage in the world due to their low cost and greater experience that has been gained compared to new ballast less tracks [2].…”

Section: Introductionmentioning

confidence: 99%

INVESTIGATING THE BEHAVIOR OF RAILROAD BALLAST IN A BOX TEST UNDER SINUSOIDAL & SIMULATED TRAIN LOADING

Alabbasi¹,

Hussein²

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The use of railway transportation systems has been increased throughout the years. Conventional ballasted tracks have been widely used in many countries around the world. Ballast material is the basic element in ballasted track, it degrades and deforms after service. Therefore, periodical ballast maintenance is required which is a cost and time expensive activity. Understanding of ballast behavior leads to efficient design and maintenance. From the literature, Discrete Element Method is used extensively to understand the behavior of railroad ballast through box test. However, most researches in the literature simulate the train loading as a pure continuous sinusoid unlike the actual loading induced by the trains. This paper aims to show the influence of simulated loading of moving train on the dynamic behavior of railroad ballast using box test via DEM. The paper utilizes the theory of Beam on Elastic Foundation to simulate a more realistic loading on railroad ballast. The results from the simulated train load are compared with those from a sinusoidal load. The results show a difference up to 6.89% between simulated train and sinusoidal loading.

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Dynamic comparison of different types of slab track and ballasted track using a flexible track model

Cited by 42 publications

References 18 publications

Large-scale triaxial and box testing on railroad ballast: a review

Large-scale triaxial and box testing on railroad ballast: a review

Contact Loss beneath Track Slab Caused by Deteriorated Cement Emulsified Asphalt Mortar: Dynamic Characteristics of Vehicle-Slab Track System and Prototype Experiment

INVESTIGATING THE BEHAVIOR OF RAILROAD BALLAST IN A BOX TEST UNDER SINUSOIDAL & SIMULATED TRAIN LOADING

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