Study On The Distribution Of Wind Pressure On The Single And Double High-rise Building(s)

With the development of China’s economy and the improvement of construction technology,there are more and more high-rise and super high-rise buildings in the city.Curtain wall structure is the most common external wall enclosure structure used in high-rise buildings,and it cannot be ignored due to strong wind or typhoon.The determination of wind pressure value and distribution law on building surface is very important for the design of curtain wall structure.In addition,it is more and more common for multiple high-rise buildings to form a group of buildings,and the interference effect between buildings becomes more and more serious.Therefore,it is an significant basis for the safety design of curtain wall structure to accurately obtain the wind pressure distribution law of the disturbed building envelope.Based on the wind tunnel test data and CFD numerical simulation technology,this paper conducted the following three aspects of research work.The wind tunnel test data of a single building with rectangular section with different width-to-thickness ratio under different wind direction angles were analyzed,and the cloud chart of average pressure coefficient on each surface of the building was obtained,which made the distribution law of wind pressure on the surface of a single building more intuitive,Subsequently,the wind pressure distribution law of a single building with different width-to-thickness ratios under different wind directions was summarized.When the short side of a single building is facing the wind,the building’s width-to-thickness ratio will basically have no effect on the wind pressure value and distribution on the windward side and the wind pressure on the leeward side of the building is relatively uniform.the absolute value of the average wind pressure coefficient of the crosswind side tends to be smaller and smaller with the increase of the width-to-thickness ratio.In this case,with the increase of the width-to-thickness ratio,the absolute value of the average wind pressure coefficient on the crosswind side tends to be smaller and smaller.When the long side is windward,the distribution of wind pressure on the windward side of buildings with different width-to-thickness ratio is basically similar,the maximum positive pressure is slightly reduced.Simultaneously and the distribution of wind pressure on the crosswind and leeward side with different width-to-thickness ratio is basically similar.This paper expounds the basic theory of computational fluid Dynamics(CFD)and the method of grid division.CFD numerical simulation was carried out for two typical high-rise buildings with square section under different wind direction angles and different spacing,and the wind pressure coefficient values of each surface of the disturbed and disturbed buildings were obtained,which were expressed in the form of pressure coefficient cloud map.The variation rule and formation mechanism of the wind pressure on the surfaces of the double building are analyzed in detail,and the interference effect of the pressure on the double building is summarized and summarized.When determining the location of two buildings,they should generally not be close to each other.Buildings that are close to each other show strong interference effects under most wind direction angles,which may have a greater impact on the safety of curtain wall structures.The wind interference effect between the two buildings is mainly manifested as shadowing effect and canyon effect;when the distance between the buildings is less than a certain range,the wake of the upstream building will affect the downstream building to varying degrees,and the wind pressure value and distribution on the surfaces of the downstream building will change significantlyAccording to the design points of the curtain wall structure of the high-rise building,this paper gives the maximum and minimum values of the wind pressure coefficients on the surfaces of the two buildings under the above different conditions,and produces a wind pressure coefficient cloud map for direct reference in the design of the curtain wall structure.In this paper,the wind pressure distribution of a single building in different wind directions is studied by wind tunnel test data.The CFD numerical simulation was used to study the wind pressure distribution of the two buildings under different wind direction angles and different spacing,and then,the extreme values of the wind pressure on each surface of the two buildings were analyzed.The analysis results can provide a good reference for the design of the curtain wall structure of actual high-rise buildings,especially double-story high-rise buildings.