The Influence On Wind Load Shape Coefficient Of Building With Projections On Its Plane And Facade

At present,In the study of building wind load shape coefficient in our country,no matter the body type or the detailed level of experimental research has a deep gap with the growth speed of the building industry.With the development of urban buildings,its style no longer stick to the simple rectangular shape.As the shape has a lot of changes on the plane and elevation,it would have a wind vortex in bump into when the wind comes.The analysis of the influence of concave and convex shape on the building wind press is very important and it has a certain reference value in the construction wind resistance design.At present,just shape coefficient of a few kinds of shape is regulated in code of our country and it is rough.The coefficient has a certain gap with the actual coefficient and it can not be able to show the distribution of wind pressure on the surface of the building.The explosive growth of computer technology in recent years lead to the importance of CFD becomes bigger and bigger in the field of calculated wind engineer and it provides a very efficient method for the study of phenomenon of flow past blunt body.Fluent software is adapted in this paper to simulate calculation and analysis the change rule of the wind pressure distribution,and then receive the wind load coefficient of the stoss side.The change of wind load coefficient of different building shape is researched.The main work is as follows:First the numerical simulation of SILSOE mode is made by using the finite software and use RSM mode,SSTK-w mode,RNGK-? mode to simulate.The calculation results obtained are compared with the ones obtained by Silsoe actual values and wind tunnel test.Then to observe the distribution characteristics and law of wind pressure,we can research of flow law of wind around blunt body figure through the flow field of wind and validate the precision of the numerical simulation of flow around a blunt body.Mode of five kinds of concave and convex in turn increase which contains control variable is established by ICEM CFD software.Wind field numerical simulation of five kinds of mode is made by Fluent software,and then we select the best mode introduced above to calculate.The wind load shape coefficient of stoss side of different mode is obtained by the method of take the averaging.Overturning moment of the mode and the wind pressure of stoss side is calculated according to the wind load shape coefficient.Then we observe if wind load shape coefficient has change rule varied with concave and convex change of construction shape.Horizontal and vertical cutting figure of flow field of each mode is done to observe the protruding pats of the flow change,put forward better shape building wind resistance to make the conclusion in the specific design and construction have some reference.