Wind Tunnel Test And Numerical Simulation Study On The Wind Load Characteristics Of Sawtooth Roofs

The damage of low-rise buildings during windstorm is the main cause of wind disaster losses in the villages and towns.Therefore,it is necessary to study the wind load characteristics and distribution rules of low-rise buildings and to provide a basis for wind-resistant design.At present,wind tunnel tests and CFD numerical simulations are mainly used to study the wind load characteristics of low-rise buildings.The wind tunnel test can comprehensively consider the surrounding environment of the building and three-dimensional flow to obtain the distribution of wind pressure on the building surface.With the continuous development of computer technology and the perfection of numerical simulation theory,computational fluid dynamics has been widely applied in the field of structural wind engineering,and it is convenient to visualize the flow field around the building,providing a study of the wind load on the surface of low-rise buildings.An effective way.This paper mainly studies the distribution law of wind pressure on the surface of sawtooth roofs through the combination of wind tunnel test and numerical simulation,and provides a favorable reference for wind resistance design of sawtooth roof.The main work is as follows:1.A wind tunnel test was conducted on a sawtooth roofs in accordance with a certain scale ratio,and the distribution of wind pressure on the surface of the roof under conditions of eleven slopes and sawtooth roofs was investigated.2.The sawtooth roofs were used for wind tunnel tests with three kinds of roof slopes and four kinds of tooth surface combinations.The foreign load code was used to partition the roof and the most unfavorable wind load distribution was obtained.The influence of the roof slope and the number of tooth surfaces on the distribution of wind pressure was analyzed.3.The CFD numerical method is used to simulate the wind load characteristics of The monosloped and sawtooth roofs by 5 different wind direction angles,and the simulation results and wind tunnel test results are compared and analyzed.The results show that the corners and edge areas of the roof were subjected to large wind suction and the intensity of airflow separation was severe.Through the study of this article,the final reference for the design and construction of this type of housing project.