Numerical Simulation Of Wind Load And Wind Tunnel Test In Long-span Roof Structure

In recent years,there have been quite a few large-span building structures in society.Along with the enhancement of national strength and the improvement of residents’ quality of life,large-span spatial structures are increasingly used.Wind load is a very important control load in the design of long-span structures.Due to the relatively diverse forms of large-span spatial structures,the average wind pressure coefficient is not yet complete in domestic load codes,so the analysis of wind loads on large-span spatial structures is of great social significance.Based on the actual project of the Three Kingdoms Performing Arts Center,this article studies the situation of the Three Kingdoms Performing Arts Center under the action of wind load.Mainly complete the following work content:1.Introduced the development history of large-span structures and the damage caused by wind loads,as well as the description of wind load research methods and related theories of wind loads,so that they have a comprehensive understanding and provide support for better numerical simulation in the future.2.The wind tunnel test was used to analyze the Three Kingdoms Performing Arts Center,and it was concluded that under the same wind direction angle,most of the exterior of the roof structure is negative pressure,the wind pressure gradient line is denser at the edge of the windward surface,and far away from the windward surface,The average wind pressure coefficient becomes uniform,the average wind pressure coefficient on the leeward surface is small,and the negative pressure value is relatively small and changes smoothly in the middle of the roof and the leeward.3.For the Three Kingdoms Performing Arts Center,use numerical simulation to calculate and obtain the average wind pressure coefficient.Compare the numerical simulation with the wind tunnel test results.The average error is about 10%,indicating that the numerical simulation and wind tunnel test have better Consistency.4.Through the numerical simulation of three different wind speeds of 20 m / s,26.8m / s and 30 m / s,the study shows that different wind speed changes have little effect on the average wind pressure coefficient of the roof structure with large span,indicating that the wind speed Changes are not the main reason for wind pressure.5.Establish numerical simulations for roof structures with different vector-span ratios(f / D).As the vector-span ratio increases,on the windward side of the structure,the wind pressure gradually rises at the top to slowly increase its value.The side negative pressure gradually expands towards the top,making the average wind pressure coefficient basically unchanged.In the horizontal direction,the average wind pressure coefficient tends to be stable.Through the research and analysis of this paper,it is found that when the wind direction angle is different,the results of numerical simulation and wind tunnel test are basically the same except for the cantilevered eaves of the large-span roof structure.The research shows that the test results obtained can be applied to actual engineering under the condition of using a reasonable numerical model.