| In recent years,large-span elliptical roof structures have been widely used in large public buildings.This type of roof structure is a wind-sensitive structure due to its large span,light weight,and high flexibility,Wind load often becomes an important factor in controlling structural safety.Therefore,accurately grasping the characteristics of the wind load distribution on the surface of the structure is of great significance for the reasonable design of the structure’s wind resistance and ensuring the safety of the structure.In this paper,using the CFD numerical simulation method and the FLUENT software,the wind load distribution characteristics on the surface of the large-span elliptical roof structure are systematically studied.Specifically including:(1)First,the key issues of turbulence model selection,boundary condition setting,meshing and solution method selection when using CFD numerical simulation method to analyze wind load on structure surface are discussed.According to the results of the discussion,the solution obtained the wind load distribution on the surface of the rectangular roof structure,and compared it with the field measurement and wind tunnel test results.It is found that the three methods have the same wind load distribution law on the structure surface,and the numerical difference is not big.It is the use of CFD Numerical simulation of the wind load on the surface of the large-span elliptical roof in this paper creates conditions.(2)Secondly,a typical large-span elliptical roof structure is selected to establish a CFD numerical model,and the wind pressure distribution on the structure surface at different wind direction angles,different ratios of length and short axis,and different roof support heights are calculated.The results show: The roof structure is dominated by positive wind pressure on the windward side,and the side and top wind pressures are positive or negative,and both are dominated by negative wind pressure.As the wind direction angle increases from 0°,the absolute value of the maximum negative wind pressure coefficient on the top surface of the roof structure gradually increases.With the increase in the ratio of the length to the short axis of the roof,the absolute value of the maximum negative wind pressure coefficient on the top surface of the structure gradually decreases when the wind direction is 0°,and the wind suction on the top of the roof gradually decreases.When the wind direction angle is 90°,the top surface of the structure is the largest the absolute value of the negative wind pressure coefficient gradually increases,and the wind suction on the top surface of the structure gradually increases.At 0° and 90° wind direction angles,as the roof support height increases,the absolute value of the maximum negative wind pressure coefficient on the top surface of the structure gradually increases,and the wind suction on the top surface of the structure gradually increases,and the support height has little effect on the wind load carrier form factor of the structural roof.(3)Finally,when considering the existence of other buildings near the large-span elliptical roof structure,the wind load distribution characteristics on the roof surface due to their interference effects are also studied.The research shows: When the rectangular disturbance structure is placed on both sides of the large-span elliptical roof structure,due to the effect of the gap,the distribution area of the maximum negative wind pressure coefficient of the roof structure increases significantly,and the absolute value of the maximum negative wind pressure coefficient increases significantly,The load carrier type coefficient in the middle of the roof structure decreases with the increase of the height of the disturbing structure.When the disturbing structure is placed in front of the large-span elliptical roof structure,the distribution area of the positive wind pressure coefficient of the roof structure is significantly reduced due to the shielding effect. |
PDF Full Text Request