Investigation On Wind Profile Simulation Of Transiting Test For Measuring The Aerodynamic Force Of Structures Based On Flat Plates Technology

As the basic work of structural wind engineering,wind profile simulation research is very important in the aerodynamics performance research of high-rise buildings,bridge towers and tall structures.The transiting test method is used to test the windresistance performance of structures via vehicle-driving wind.Due to the small size of the car roof,the method of simulating the wind profile with the combination of spire and rough element commonly used in wind tunnel tests is not applicable,and it is necessary to find a suitable wind profile simulation method.In this paper,based on the differentially-spaced flat plates technology,a wind profile simulation method for the transiting test method is developed,and the method provided an appropriate wind field environment for the subsequent research on the aerodynamic performance of the structure.Coastal(terrain A)and urban(terrain C)landforms wind profiles were simulated by the flat plates technology,and the influencing factors were studied.At the same time,the topographic factor wind profile correction technology was proposed to obtain terrain B and D wind profiles by modifying terrain A and C wind profiles.Firstly,the wind profile of urban landforms was simulated by using differentiallyspaced flat plates technology.Using the transiting test method and the differentially spaced flat plates technology,the effect of the distance between flat plates and measuring points,the length of flat plates along the wind direction,the distance between adjacent flat plates,the number of flat plates,and the vehicle speed on the simulation results of urban(terrain C)landforms wind profiles were investigated.The results show that the vehicle speed is 72 km/h(20 m/s),the distance between the flat plates and measuring points is properly adjusted from 300 mm to 340 mm,the length of the flat plates along the wind direction is 300 mm,the wind profile and turbulence intensity profile obtained by transiting test method well can be well consistent with the urban(terrain C)landform in GB 50009-2012.Secondly,the wind profile of coastal landform was simulated by using differentially spaced flat plates technology.Using CFD and the transiting test method,2D and 3D geometric models were established respectively in CFD,the results of shear stress transport k–ω(SST k–ω)and large eddy simulation(LES)turbulence models were study,and the wind profile simulation results of numerical simulation and the transiting test method were analyzed.The results show that the vehicle speed is 72 km/h(20 m/s),the distance between the flat plates and measuring points is properly adjusted from 240 mm to 300 mm,and the inclination angle of the three flat plates at the bottom is 7°,the wind and the turbulence intensity profiles obtained by the CFD and the transiting test methods are in good agreement with the coastal(terrain A)landform.in GB 50009-2012.Finally,a wind profile correction method based on topographic factor for the transiting test method is proposed,and the topographic factor calculation model was established,terrain A and terrain C wind profiles were modified into terrain B and terrain D wind profiles,and the wind profile correction results were analyzed.The results show that the modified wind profile of terrain B and terrain D are in good agreement with the wind profile in GB 50009-2012.