Experimental study on stiffness degradation of Crts Ⅱ ballastless track-bridge structural system under fatigue train load

Zhou, Lang; Zhao, Lei; Mahunon, Akim D.; Zhang, Yingying; Li, Hua-Yong; Zou, Lifan; Yuan, Yahui

doi:10.1016/j.conbuildmat.2021.122794

Cited by 16 publications

(2 citation statements)

References 20 publications

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“…According to the similarity principle [ 28 , 29 ], a one-quarter-scaled specimen of a ballastless track slab was designed and built. The concrete, emulsified asphalt mortar [ 30 , 31 , 32 , 33 , 34 , 35 ], steel bar, and other materials used in the specimen are consistent with that of the prototype structure.…”

Section: Test Overviewsupporting

confidence: 56%

Mechanical Performance of a Ballastless Track System for the Railway Bridges of High-Speed Lines: Experimental and Numerical Study under Thermal Loading

et al. 2021

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The mechanical performance of China Railway Track System type II (CRTS II) ballastless track suitable for High-Speed Railway (HSR) bridges is investigated in this project by testing a one-quarter-scaled three-span specimen under thermal loading. Stress analysis was performed both experimentally and numerically, via finite-element modeling in the latter case. The results showed that strains in the track slab, in the cement-emulsified asphalt (CA) mortar and in the track bed, increased nonlinearly with the temperature increase. In the longitudinal direction, the zero-displacement section between the track slab and the track bed was close to the 1/8L section of the beam, while the zero-displacement section between the track slab and the box girder bridge was close to the 3/8L section. The maximum values of the relative vertical displacement between the track bed and the bridge structure occurred in the section at three-quarters of the span. Numerical analysis showed that the lower the temperature, the larger the tensile stresses occurring in the different layers of the track structure, whereas the higher the temperature, the higher the relative displacement between the track system and the box girder bridge. Consequently, quantifying the stresses in the various components of the track structure resulting from sudden temperature drops and evaluating the relative displacements between the rails and the track bed resulting from high-temperature are helpful in the design of ballastless track structures for high-speed railway lines.

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Section: Test Overviewsupporting

confidence: 56%

Mechanical Performance of a Ballastless Track System for the Railway Bridges of High-Speed Lines: Experimental and Numerical Study under Thermal Loading

et al. 2021

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“…Jiang et al [15] studied the effect of the uneven settlement of the subgrade on the dynamic response of the track system. Meanwhile, some scholars have also researched the fatigue damage of ballastless tracks [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Influence of Structural Types of CRTS I Plate-Type Ballastless Track on Aerodynamic Characteristics of High-Speed Train

Bian

Zhang

2022

Urban Rail Transit

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In order to improve the running quality of trains on a ballastless track, the influence of the CRTS I ballastless track with different structures (flat-type and frame-type tracks) is investigated with respect to the aerodynamic characteristics of high-speed trains. In the present paper, the aerodynamic force changes on the head, middle, tail, and whole car of the high-speed train were studied under two conditions, with crosswind and without crosswind, and the influence of different crosswind speeds (10, 15, 20, 25, 30 m/s) on the aerodynamic force of the train was analyzed. The pressure and flow field distribution characteristics were also studied, and the reasons for the different aerodynamic characteristics of different track structures and trains running in different wind environments were analyzed, respectively. The results indicate that the ballastless track structure obviously influences the aerodynamic characteristics of the high-speed train. When there is no natural wind, compared with the flat track, the frame track reduces the drag and lateral forces of the train but increases the lift force. The frame track causes the drag force of the whole vehicle to decrease slightly (the maximum ratio is 2.15%), the lift force increases significantly (the maximum ratio is 12.55%), and the lateral force obviously decreases (the maximum ratio is 52.43%). The lift and lateral forces of the middle car are most affected, which is because the frame structure changes the vortex motion state of the middle car. Compared with the flat track, the drag force of each car on the frame track is reduced under the crosswind; the lift force of each car is increased, and the maximum increase in the lift force of the head, middle, and tail cars is 5.60%, 2.55%, and 3.63%, respectively; the lateral force of the tail car increases greatly at a wind speed of 15 m/s, reaching 6.84%. Due to the existence of the frame structure, the space under the vehicle increases, resulting in a decrease in the airflow rate and an increase in local pressure, which leads to changes in the train’s aerodynamic force. Meanwhile, the train’s aerodynamic change under the crosswind is smaller than that when there is no wind.

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Vibration Transmission of Ballastless Track-bridge with Different Span Lengths under Updated High-speed Trains

Zhou,

Yang,

Liu

et al. 2024

KSCE J Civ Eng

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Experimental study on stiffness degradation of Crts Ⅱ ballastless track-bridge structural system under fatigue train load

Cited by 16 publications

References 20 publications

Mechanical Performance of a Ballastless Track System for the Railway Bridges of High-Speed Lines: Experimental and Numerical Study under Thermal Loading

Mechanical Performance of a Ballastless Track System for the Railway Bridges of High-Speed Lines: Experimental and Numerical Study under Thermal Loading

Influence of Structural Types of CRTS I Plate-Type Ballastless Track on Aerodynamic Characteristics of High-Speed Train

Vibration Transmission of Ballastless Track-bridge with Different Span Lengths under Updated High-speed Trains

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