Abstract
In this paper, a high-speed train–CRTS III slab track–subgrade coupled dynamic model is established. With the model, the influence of vehicle number on the dynamic characteristics of a train–CRTS III slab track–subgrade coupled system with smooth and random track irregularity conditions for conventional and vibration-reduction CRTS III slab tracks are theoretically studied and analyzed. Some conclusions are drawn from the results: (1) the largest dynamic responses of the coupled system for all items and cases are no longer changed when the vehicle number exceeds three, and three vehicles are adequate to guarantee the simulation precision to investigate the dynamic responses of the coupled system. (2) The acceleration of the car body has almost no relation with the vehicle number, and only one vehicle is needed to study the vehicle dynamics using the train–CRTS III slab track–subgrade coupled dynamic model. (3) For the conventional CRTS III slab track on a subgrade, the vehicle number has a negligible influence on the accelerations of the rail, slab, and concrete base, the positive and negative bending moments of the rail, the compressive force of the fastener, and the positive bending stress of slab, but it has a large influence on the tension force of the fastener, and the negative bending stresses of the slab and concrete base. Only one vehicle is needed to study track dynamics without considering the tension force of the fastener, the negative bending stresses of the slab and concrete base, otherwise, two or more vehicles are required. (4) For vibration reduction of the CRTS III slab track on a subgrade, the number of vehicles has some influence on the dynamic responses of all track components, and at least two vehicles are required to investigate the track dynamics.
Highlights
In recent years, high speed railways have been widely used around the world due to their outstanding advantages, such as their large capacity, comfort, punctuality, safety, and environmental friendliness
(3) For the conventional China railway track system (CRTS) III slab track on a subgrade, the vehicle number has a negligible influence on the accelerations of the rail, slab, and concrete base, the positive and negative bending moments of the rail, the compressive force of the fastener, and the positive bending stress of slab, but it has a large influence on the tension force of the fastener, and the negative bending stresses of the slab and concrete base
To research the rail acceleration, only one vehicle is needed for the conventional CRTS III slab tracks without track irregularity and with random track irregularity, and the vibration-reduction CRTS III slab track with random track irregularity
Summary
High speed railways have been widely used around the world due to their outstanding advantages, such as their large capacity, comfort, punctuality, safety, and environmental friendliness. Most of the previous research work focused on dynamic vibration responses and dynamic wheel–rail and fastener forces of the coupled system; the dynamic bending stresses of the ballastless track, which are key factors to design a ballastless track, especially for the vibration-reduction ballastless tracks, were not examined in detail To overcome these limitations, in this paper, a high-speed train-CRTS III slab track– subgrade coupling dynamic model, which can consider both the conventional CRTS III slab track, as well as the vibration-reduction CRTS III slab track, is established. The influence of the vehicle number on the dynamic characteristics of the train–CRTS III slab track–subgrade coupled system for different ballastless track structures and track irregularity conditions were studied. Because of the required model length, the moving distance of the train and the simulation time can be greatly reduced with a low vehicle number in modeling the train–ballastless track–subgrade coupled system
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