Dynamic Response of Canopy Accessory Structure of High-Speed Railway Station

To study the dynamic response of the canopy accessory structure under train-induced wind turbulence, this paper takes a canopy accessory structure of a high-speed railway station as the research object, establishes simulation models of the canopy accessory structure and the high-speed train, and analyzes the distribution law of train-induced wind pressure (for short, wind pressure) withstood by the canopy accessory structure when the high-speed train passes through at different speed levels. Based on the experiment and the analysis above, dynamic response and fatigue life of the canopy accessory structure are studied. The reasonable design height of the canopy accessory structure when adopting different connection schemes is determined under the limit condition that features the combined effect of train-induced wind and grade 8 ambient wind. The results show that under the same height, the extreme wind pressure of the canopy accessory structure increases with the increase in train speed. Under the same speed level, the extreme wind pressure of the train decreases with the increase in the height. When the high-speed train passes through the canopy at the same speed level, the stress extremum of the LED screen is the largest, followed by that of the station stop sign, and the stress extremum of the exit sign is the smallest. The fatigue life of the canopy accessory structure constantly reduces with the increase in the train speed. Under the current operating conditions, the canopy accessory structure will not have fatigue failure in service for 100 years, of which the fatigue life of the LED screen is the shortest, and the fatigue failure will occur at the top connection part first. The range of reasonable design height of the optimal connection scheme for the canopy accessory structure is within 5. 72 m-10. 50 m under the limit condition. © 2023 Chinese Academy of Railway Sciences. All rights reserved.