Study On Wind-induced Interference Effect Of Light Building Group With Five Ridges And Four Slopes

Light five-ridge and four-slope houses are widely used,especially in some military camping houses and outdoor temporary buildings,and are often arranged in groups in use,and the houses themselves are lighter in weight,so they are more sensitive to the effect of wind,which is also The wind load is usually used as its control load in its structural design.However,at present,domestic and foreign regulations have less provisions on group interference effects,and they are mostly concentrated on high-rise groups.There are no regulations on low-rise houses of the same size and volume,which makes them unfounded in the design.The rationality and safety of the use of housing groups require urgent research on wind-induced interference effects.Based on the basic theory of atmospheric boundary layer and the basic principles of computational fluid dynamics(CFD),this paper uses FLUENT software to conduct a large number of trial calculations with the help of TTU test,and discusses and analyzes the calculation domain size,mesh type and quantity,and turbulence model.,Discrete format,solving algorithm and convergence criterion and other main technical parameters to establish a numerical wind tunnel.On this basis,the layout plan is designed according to the functional requirements of the light five-ridge and four-slope houses in the form of groups,and five horizontal and vertical density coefficients,as well as 0 ° and 45,are selected to reflect the relationship between the group house spacing and the length and width of the house Three wind direction angles of ° and 90 ° are used to numerically simulate the combined 75 working conditions to obtain the surface wind pressure distribution law of the target house under the group layout,and then introduce interference factors to quantify the windinduced interference effect of the house group.The wind load carrier coefficients suitable for the wind resistance design of light five-ridge four-slope houses are obtained.The results show that the numerical wind tunnel simulation method is not only economical and efficient but also guarantees accuracy when studying the effects of wind-induced interference on large-scale multioperating housing complexes.The houses located at the sides and corners of the regularly-arranged housing group are particularly affected by the wind-induced interference effect;the interference effect of the house group at the 45 ° wind direction angle is more unfavorable than when it is 0 ° and 90 °;When the density factor is 0.5,the maximum value of the amplification effect on the surface of the house is 2.4,so the influence of the wind-induced interference effect cannot be ignored.When the density factor exceeds 1.5,the influence of the wind-induced interference effect varies from 70% to 80%.After the decrease,it tends to be stable.When the density factor is greater than or equal to 5,the wind-induced interference effect basically disappears;through the analysis of the wind pressure distribution and interference factors on the surface of the light-five five-ridge and four-slope houses under the regular layout,the target houses are obtained.The wind load carrier type coefficient provides a reference for the determination of the spacing of such housing groups under regular layout and wind resistance design.