Study On Wind-induced Interference Effect Of Four-slope Light Building Group

Four-slope light houses are widely used in civil and military fields,in practical applications,these houses are often in the form of group layout,because of the lighter quality of houses,wind loads are usually the control loads in structural design.However,at present,domestic and foreign codes for the wind load body shape factor of single building surface are more detailed,and related research is also more,while the codes for the same type group layout house wind load body shape factor is not detailed and specific,especially for low buildings,the relevant provisions on design are less explained,and the related research on low building group is not much,lagging behind the engineering application.Therefore,it is of great theoretical significance and engineering application value to study the wind-induced interference effect of light-weight buildings on four slopes.In order to study the wind-induced interference effects of light four-slope houses,based on the basic theory of atmospheric boundary layer and the basic principles of computational fluid dynamics(CFD),numerical wind tunnel simulation of the TTU model using the finite element analysis software,after a lot of trial calculation analysis and discussion,the key techniques and parameters such as the calculation domain size,mesh type and quantity,turbulence model,discrete format,solution algorithm and convergence criterion for numerical wind tunnel simulation of low-rise buildings are determined.According to the functional requirements of four-slope light building group,the layout plan of the house group is designed,on the basis of,use three wind angles of 0°,45° and 90°,five transverse density coefficients and five longitudinal density coefficients,a total of 75 operating conditions were numerically simulated,through the analysis of the simulation results,the distribution of wind pressure on the surface of the target house in the group is obtained,the introduction of interference factors quantifies the strength of group wind induced interference effects,the wind load shape coefficient suitable for the group is obtained.The results show: It is a very effective,time-saving and economical method to establish a numerical wind tunnel to study the wind-induced interference effects of buildings under multivariate and multiple-case conditions;The influence of wind-induced disturbance is particularly serious for the houses in the corner and the edge under the regular arrangement;Under the three wind directions,the wind-induced disturbance effect of group houses is the most complex under 45 degrees wind direction;When the distance between houses is 0.5times the length of houses,the maximum magnification of wind pressure on the surface of houses is 2.5 times,so the effect of wind-induced interference can not be ignored,When thedistance between houses is more than 1.5 times of the length of houses,the wind-induced interference effect tends to be stable and the degree of influence decreases by about 75%,when the distance between houses is more than 5 times of the length of houses,the wind-induced interference effect basically disappears.By analyzing the wind pressure distribution and interference factors of the light four-slope house under the rule layout,the wind load shape coefficient of the house under the group layout is obtained,this paper provides a theoretical basis for the group’s wind resistance design and group layout.