Wind Tunnel Test And Numerical Simulation Study Of Wind Load On The Surface Of Large Span Stadium

Large-span roof structure has light self-weight,large flexibility,small damping,and its structural self-oscillation period is close to the excellent period of wind speed,so the large-span roof structure is extremely sensitive to wind load.The building height of largespan roof structure is low,and it is usually located in the near-ground area with high wind speed variation and high turbulence in the atmospheric boundary layer,and the building shape is very complex,so the wind load caused by airflow bypass is very complicated.The modern building distribution is more and more dense,and the large-span roof structure is subject to the aerodynamic interference of the surrounding buildings,which cannot be ignored.The current load code in China does not provide for the wind load value and group layout interference effect of complex shaped large-span roof structure,so it is necessary to make a study on the wind load characteristics of complex shaped large-span roof structure under group building group.In this thesis,a large-span gymnasium in Hefei is used as the background of the project,and the wind load characteristics are studied by wind tunnel test and numerical simulation method for its special shape,considering the aerodynamic interference of the surrounding dense buildings,so as to provide effective theoretical guidance and direct design basis for the engineering wind resistance design.The main research contents are as follows.(1)The wind tunnel test method was used to analyze the wind load characteristics of the surface of the main hall of the stadium.The wind load characteristics of the roof of the main hall were studied,and the contour diagrams of the average wind pressure coefficient,the contour diagrams of the pulsating wind pressure coefficient and the contour diagrams of the minimal wind pressure coefficient were drawn under five typical wind direction angle conditions.Typical measurement points were selected on each facade and roof of the main building,and the mean wind pressure coefficient and pulsating wind pressure coefficient were plotted with the wind direction angle at the measurement points to analyze the influence of wind direction angle on the wind load characteristics.(2)The Reynolds averaging method was used to simulate the average wind pressure distribution law on the surface of the main pavilion under the group interference effect considering different wind angle conditions.The cloud diagram of the average wind pressure coefficient of the roof under 5 typical wind angle conditions is given to analyze the wind load characteristics of the roof.According to the modeling characteristics of the main pavilion,a reasonable partition is made for each facade and roof of the main pavilion,and a typical partition is selected in each facade and roof.The wind load volume coefficients of each partition are calculated,and the variation of wind load volume coefficients of typical partitions with wind angle in all wind directions is given,and the influence of wind angle variation on wind load volume coefficients is analyzed.A separate simulation is performed for the gymnasium,and the influence of the surrounding buildings is quantified by the disturbance factor.(3)Large Eddy simulation method was used to simulate the average wind pressure and pulsating wind pressure distribution pattern on each facade and roof of the main hall,considering five typical wind angle conditions.Monitoring points at the same location as the wind tunnel test are arranged on each facade and roof,and typical measurement points are selected to calculate the average wind pressure coefficient and pulsating wind pressure coefficient and compare them with the wind tunnel test results.Typical partitions are selected,wind load volume coefficients are calculated and compared with the Reynolds average simulation results to provide a basis for structural wind resistance design.