Study On The Influence Of High-speed Maglev Overtaking Station On Slipstream And Building Wind Pressure In Ground Island Station

Frequent acceleration and deceleration of high-speed maglev trains entering and leaving the station will affect the time cost of passengers and the economic benefits of the operation department.In order to improve the operation efficiency and save passengers’ travel time,there will be many cases of non-stop over the station on high-speed maglev lines in the future.The slipstream and pressure fluctuation caused by high-speed maglev train overtaking the station has strong turbulence characteristics,which affects the safety of platform personnel and buildings.It is a problem that must be solved in the construction and development of high-speed maglev rail transit in the future.Taking the high-speed maglev ground island station as the research object,this paper uses the numerical simulation method to study the influence law of the aerodynamic effect of high-speed maglev train overtaking the station on the slipstream on the platform and the wind pressure on the surface of the building structure.The main research conclusions are as follows:(1)The slipstream distribution law of platform under different station building structural parameters is proved.When the platform is equipped with a 1.6m high safety door,the speed of slipstream first increases and then decreases with the height increases from the ground.The maximum speed of slipstream reaches 17.5m/s at the height of 2m from the platform ground.With the increase of the height of the safety door and the distance between the safety door and the edge of the platform,the wind speed at the pedestrian height of the platform decreases significantly,which significantly improves the safety of platform personnel.The critical curves of the height of the safety door and the distance from the platform edge when a single maglev train crosses the station at 600 km/h are obtained by integrating the two personnel safety evaluation methods of wind speed method and aerodynamic drag method.(2)The influence laws of train speed and station building structural parameters on the surface wind pressure of emergency exit and canopy are obtained.The peak value of the positive pressure on the safety door surface increases in a square relationship with the increase of the train passing speed,increases in a linear relationship with the increase of the safety door height,decreases gradually with the increase of the distance from the safety door to the edge of the platform,and has no effect with the increase of the canopy height;The wind pressure on the canopy surface increases in a square relationship with the increase of train passing speed,decreases in a linear relationship with the increase of PSD height,increases in a linear relationship with the increase of the distance between PSD and platform edge,and decreases in a linear relationship with the increase of canopy height.(3)The empirical formula of maximum effective wind pressure value of safety gate and canopy of island station on the ground is summarized,and the wind-resistant design suggestions of high-speed maglev train passing station building are put forward,which can provide reference for the value of train wind load in adjacent structure design of maglev railway.