Effects of Crosswind on Freight Train Derailment Process on Heavy Haul Railway Bridge

The spatial vibration calculation model of freight train-track-bridge(FTTB) system under the crosswind action was established by adopting the crosswind action as the hunting wave of bogie frame. Based on the random energy analysis theory of train derailment, the calculation method of train derailment process on heavy haul railway bridge under the crosswind action and the early warning principle of train derailment were proposed. The method was used to calculate the whole process of train derailment on the bridge under different wind speeds and vehicle speeds, and to analyze the influence of crosswind on the derailment process of freight train. The results show that at the vehicle speed of 60~80 km/h and the wind speed of 20.7~28.4 m/s, the wheel lift value reaches 25 mm, causing the train derailment. As the wind speed and vehicle speed increase, the derailment coefficient, wheel load reduction rate, the lateral relative displacement between bogie and rail, the lateral displacement of the middle of beam span and the top of the pier all increase significantly. With the safety factor of 1.25, the early warning threshold values of relative displacement between the bogie and rail at different vehicle speeds and wind speeds are obtained. The above results can provide theoretical foundation and basic data for the development of early warning devices for train derailment on heavy-haul railway bridge under crosswind. © 2022, Department of Journal of the China Railway Society. All right reserved.