Study On Vibration Of Canopy Structure During High Speed Train Passage

With the continuous development of China's high-speed railway industry,the running speed of trains continues to increase.High-speed trains produce strong train wind-induced vibration responses to the adjacent structures of the railway.The structure of the rain shed is a typical example of the adjacent structure of the railway.The canopy structure has a large span,the structure is light,and it is close to the positive line,which is obviously affected by the train wind.Therefore,the dynamic analysis of the canopy structure is very important.In this paper,the rain canopy of a station is used as the engineering background.The fluid dynamics software FLUENT is used to simulate the train wind load time history data generated when the train travels through the canopy at high speed,and the wind load time history data is applied to the structural model of canopy by partition loading.The fluid mechanics software FLUENT simulates the train wind field based on the basic theory of computational fluid dynamics.The simulated wind field uses a three-dimensional,viscous,unsteady,incompressible k-?bi-equation model and uses symmetry to pass finite Calculate the area to simulate an infinite real space environment.The slip grid technology is used to simulate the working conditions of the high-speed train with a speed of 300 km·h^-1 passing through the station canopy structure,and the load time history data is obtained and compared with the measured data.On this basis,the distribution of train wind in space is analyzed,and the distribution law of train wind pressure in longitudinal,lateral and vertical directions is obtained.At the same time,the finite element model of the station canopy structure was established by the finite element software ANSYS.In order to analyze the weak parts of the canopy structure,the modal analysis of the canopy model was carried out.The research shows that the first few vibration frequencies of the canopy structure are concentrated,and the vibration modes are mainly concentrated on the vertical self-vibration of the roof panel,and the overall vibration is less.The wind load time history data of the train with a speed of 300 km·h^-1 is loaded into the finite element model of the canopy structure by means of zone loading.The wind-induced vibration response of the canopy structure under the action of train wind is analyzed,and the simulation is obtained.The vertical vibration velocity,acceleration and displacement data at the point are verified against the measured data.On this basis,the vertical vibration velocity,acceleration and displacement distribution of the canopy structure roof panel in the vertical orbit direction are analyzed.After that,three kinds of working conditions of train speeds of 250 km·h^-1,350 km·h^-1 and 400 km·h^-1 were simulated by finite element software ANSYS,and relevant data were obtained.The variation law of wind-induced vibration response of the canopy structure under four kinds of train speeds was compared and analyzed,and the wind-induced vibration response of the canopy structure was evaluated.