Study On Wind-induced Snow Distribution Law Of Long-span Hyperbolic Roof Structure

Nowadays,long-span hyperbolic roof structure has gradually become one of the mainstream forms of architectural structure.Damage caused by uneven distribution of snow cover in this kind of buildings has occurred frequently in recent years.Wind load is an important factor affecting the distribution of snow cover on the structure surface.In the anti-snow design of long-span structure,flow around and reattachment will occur when the air flow passes through the structure,and the snow particles will have complex drift and accumulation movement under the action of wind,resulting in uneven distribution of snow cover on the structure surface and wind-induced snow pressure.In the design of long-span structure,one of the most important factors to be considered is the drift and accumulation of snow cover on the structure surface under the action of wind load(often called snow drift),and the resulting distribution of snow cover on the structure surface,that is,wind-induced snow cover.Therefore,correctly predicting the distribution of snow cover on the surface of large-span hyperbolic roof under the action of wind induced snow cover is of great significance to the design of snow disaster resistance of this kind of building structure.In this paper,relying on FLUENT numerical simulation platform and applying the wind-induced snow drift theory,the distribution law of wind-induced snow on the surface of long-span hyperbolic roof structure was studied.The main research contents are as follows:(1)Using the Euler-Euler method,based on the Mixture multiphase flow model and the klk--? model,studying the wind-induced snow distribution of long-span hyperbolic roof with square、rectangle、round、oval hyperbolic roof surface structure.The numerical simulation of the distribution of wind-induced snow in typical building shapes is carried out,and the results are compared with the existing literature to verify the correctness of the numerical simulation method.The wind-induced snow pressure on the surface of four common large-span hyperbolic roofs was simulated,and the important parameters of grid division and wind-induced snow simulation are studied and analyzed.The simulated distribution of wind-induced snow cover pressure is compared with the average distribution of roof surface pressure under separate wind action in wind tunnel experiment.(2)Researching the influence of important parameters such as wind direction Angle,wind speed and snowfall intensity on the snow distribution on the surface of square,rectangular,circular and oval hyperbolic roof was studied;Under the most unfavorable combination,the distribution of wind-induced snow cover pressure on the surface of four large-span hyperbolicroof structures was studied,and the wind-induced snow cover pressure coefficients on the surface of large-span hyperbolic roof structures were divided.In this paper,the wind-induced snow pressure distribution of large-span hyperbolic roofs with different wind directions is calculated,and the distribution rules of snow pressure on roofs are analyzed,the characteristics and rules of wind-induced snow pressure distribution on the surface of large-span hyperbolic roof structure under the action of wind and snow are summarized;The influence rule of each parameter on the distribution coefficient of snow cover on the surface of four kinds of roofs is obtained,and the reasonable partition suggestion value of the pressure coefficient of snow cover caused by wind under the adverse parameter combination is put forward.It provides valuable reference for the anti-snow design of this kind of buildings.This paper has 46 figures,15 tables and 51 references.