Dynamic Response of Bridge Barriers Subjected to Wind and Wheel/Rail Forces Induced by a 400km/h Train

With the development of society, train operating speeds will reach over 400[Formula: see text]km/h in response to the increasing travel demands of passengers for greater speed and comfort. However, an increase in train speed will inevitably pose a threat to the safety and durability of the infrastructure along the high-speed railway (HSR), thereby affecting the normal operation of the train. This paper employs Computational Fluid Dynamics (CFD) to calculate the magnitude and law of the train-induced wind (TIW) generated by a moving train. Furthermore, it establishes a train–bridge interaction system to calculate the force acting on the barrier. Subsequently, the dynamic response of the barrier was considered when different loads generated by the train were applied to the vertical barrier. The results indicated that the peak TIW pressure of trains within a range of 7.5[Formula: see text]m from the entrance and exit of the barrier exhibited a notable variation, with a difference of approximately 40%. When the train speed increased from 350[Formula: see text]km/h to 400[Formula: see text]km/h, it exerted a considerable influence on the peak vertical and lateral displacement of the 32[Formula: see text]m simply supported beam bridge, with an increase of 79.47% and 84.84%, respectively. The response of the barrier is significantly impacted by the train speed when the wheel/rail forces of the train act. Meanwhile, the height and ventilation rate of the barrier have a significant impact on its lateral response, while the vertical response is minimally affected. The findings of this research have significant engineering implications for ensuring the safety of HSR bridge barriers and the safe operation of trains traveling at 400[Formula: see text]km/h.