Interface Damage Assessment of Railway Slab Track Based on Reliability Techniques and Vehicle-Track Interactions
Publication: Journal of Transportation Engineering
Volume 142, Issue 10
Abstract
The interface damage as one of the most critical damage issues in railway slab tracks is evaluated in this work on the basis of reliability techniques and vehicle-track interactions. First, a coupled dynamics model of a vehicle and the slab track is developed involving nonlinear spring-damper elements for simulation of the interface damage. Furthermore, considering the random nature of the damage length, the damage height, the rail pad stiffness, and the elastic modulus of cement asphalt (CA) mortar layer, explicit mathematical expressions between the input stochastic variables and output dynamic responses are obtained on the basis of the combination of the response surface method (RSM) and the dynamic simulations of vehicle-track system. Subsequently, Monte Carlo (MC) simulations are performed for the probability analysis by directly using the response surface functions. Finally, by adopting the amplification factor (AF) of the dynamic response as the control indices, the damage assessment criterion and the corresponding safety threshold are suggested on the basis of the concept of reliability for the long-term dynamic performance of slab tracks. The results show that the interface damage has a significant influence on the slab displacement, the slab acceleration, and the dynamic stress of CA mortar layer; the damage length is the primary control index for the interface damage with a complete failure along the width of the slab track; the interface damage can be evaluated as damage levels I, II, and III when the survival probabilities for the AF of exceeding a certain value are 50, 30, and 10%, respectively; the safety thresholds for the interface damage levels I, II, and III are suggested to be 0.60, 0.85, and 1.05 m, respectively.
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Acknowledgments
This work was supported by the National Key Basic Research Program of China (973 Program) (Grant Nos. 2013CB036202 and 2013CB036206), the Program of Introducing Talents of Discipline to Universities (111 Project) (Grant No. B16041), the Youth Talent Fund from State Key Laboratory of Traction Power (2016TPL_T12), and the Open Foundation from State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology (Grant No. GZ15109).
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Published In
Journal of Transportation Engineering
Volume 142 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Dec 16, 2015
Accepted: Mar 9, 2016
Published online: May 23, 2016
Published in print: Oct 1, 2016
Discussion open until: Oct 23, 2016
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