| The light four-slope building is widely used in military and civil fields.It is a low building sensitive to wind load because of its light self-weight.Wind load is the control load in the design.At the same time,this kind of house always used in group layout,staggered layout is one of the forms of group layout.There is a group effect of mutual interference between houses in group layout,and the distribution characteristics of wind pressure on the surface of houses are very different from those of single house.There are no specific provisions for reference in the load codes at home and abroad,and the codes lag behind engineering practice.The research on group interference effect always focuses on large cooling towers,high-rise buildings and cube buildings,while the research on four-slope houses with the same shape and volume in staggered layout has not been reported yet.In order to improve the planning and layout of light four-slope housing group and wind resistance design method,the study on wind-induced disturbance effect of staggered four-slope housing group has theoretical significance and engineering application value.For the study of staggered layout light hipped house group of wind-induced interference effects,using computational fluid dynamics software Fluent,numerical wind tunnel with the reference count of TTU low buildings basic research,analysis and discusses the calculation domain size,meshing method,and the quantity,turbulence model,discrete format,algorithm and convergence criteria such as the main technology and parameter selection.According to the code and the functional requirements of buildings,the layout of eight four-slope houses was designed.With five kinds of horizontal and longitudinal density coefficients and three kinds of wind direction angles as parameters,which reflect the ratio of the house spacing to the corresponding size of the house plane,a total of 75 working conditions were simulated.The isoline of the wind pressure coefficient and the variation rule of the average wind pressure coefficient on the surface of buildings are analyzed by comparing with the single buildings on four slopes.Interfering factors were introduced to quantify the disturbance degree of the staggered layout relative to the individual,and the variation rules of the wind direction Angle and the density coefficient of the interference factors were analyzed,so as to obtain the shape coefficient of the wind load suitable for the staggered layout.At the same time,the wind load body coefficient of common light houses is summarized and summarized.The results show that it is feasible and effective to use the numerical wind tunnel simulation to study the wind-induced disturbance effect of staggered light four-slope house group.Compared with the single layout,the staggered four-slope houses have significant magnifying effect and shielding effect,and the phenomenon of wind pressure change appears in some areas.The amplification of wind pressure in the area with the magnifying effect on the housing surface is up to 241%,and the disturbance effect is strong and can not be ignored.When the wind direction Angle is constant,the density coefficient is the key parameter to influence the intensity of interference effect.With the increase of the density coefficient,the interference effect is gradually weakened.R_x=5 and R_y=5 are the critical density coefficients for the disappearance of the interference effect.When the density coefficient is less than the critical value,the maximum disturbance factor is multiplied by the body coefficient of the single house as the amplification factor to obtain the body coefficient of wind load suitable for the staggered layout of four-slope houses.At the same time,the wind load body coefficient of 6 kinds of common light houses under 13 kinds of layout conditions is put forward,which provides the basis for the wind resistance design of light houses. |
