Numerical Investigation On The Distribution Of Wind-induced Snow Cover On The Roof Of Arc-shaped Long-span Structure Roof

The wind-induced uneven snow accumulation on the roof of the large-span structure is the main cause of the collapse of the large-span structure in winter.China’s code^[1]classifies the uneven distribution of snow on the surface of the structure less,and only stipulates the conventional structure.For the increasingly complex long-span structure,it is obviously not able to meet the engineering needs.Therefore,it is complicated to study in combination with engineering examples.The uneven distribution of wind-induced snow on large-span structural roofs has very important practical significance.Based on CFD software and multiphase flow theory,the Mixture model is selected to establish a flow field model that can simulate wind and snow two-phase flow to study the distribution of wind-induced snow cover in the Guoluo airport terminal and Huatugou airport terminal.The main research contents and conclusions are as follows:（1）Study the distribution of wind-induced snow around the cube.Comparing the distribution of wind-induced snow around the cube under different turbulence models with the test results,it is found that the simulation results of the k-kl-w turbulence model are the closest to the test results,so the k-kl-w turbulence model is selected for subsequent numerical simulations.（2）Research on the snow distribution law of the Guoluo airport terminal and Huatugou airport terminal under different wind speeds and wind direction angles.From the simulation results,it can be seen that the wind direction angle parameter mainly affects the location of the snow erosion and accumulation area of the building house,and has little effect on the degree of snow erosion of the building house area;the wind speed parameter mainly affects the degree of snow erosion of the building house.It has little effect on the location of snow erosion and accumulation areas in the building area.（3）Research on the snow distribution coefficients of the area of zoning houses in the terminal building of Guoluo airport and the terminal building of Huatugou airport under various working conditions.The maximum snow distribution coefficient of the partition house area of the Guoluo airport terminal is in the area farthest from the velocity entrance of the flow field;the maximum snow distribution coefficient of the partition house area of the Huatugou airport terminal is connected to the ground of the terminal building areas,these areas should attract enough attention when calculating snow loads in roof reinforcement and disaster prevention design.（4）The snow uneven distribution coefficients of the Guoluo airport terminal building and the Huatugou airport terminal building area are proposed,which can provide a reference for the winter snow disaster prevention and reinforcement of the project.