Study On Wind-induced Snow Drift On The Surface Of A House With Two Slopes Protruding From A Flat Abdomen

The double-slope houses protruding from the plane abdomen have been widely used in camping houses and civil buildings in China.However,the current design specifications have not given the snow distribution coefficient of this shape,and the structural snow-resistant design is often only approximated by a single span.Double-sloping roofing,especially when the self-weight of such houses is light,is a structure sensitive to wind and snow loads,and its design may have potential safety hazards.Therefore,the snow accumulation law and snow distribution coefficient of the double-slope houses protruding from the plane abdomen are studied.And discussion,can provide theoretical basis and engineering design application for the specification,with good theoretical significance and engineering value.Based on the computational fluid dynamics principle and the two-phase flow theory,the ICEM CFD software is used for numerical modeling.The Mixture multiphase flow model in FLUENT software is used to numerically simulate the snow drift around the cube and compare it with the measured data.Discuss parameter selection and boundary condition settings.Based on the wind-snow drift numerical wind tunnel trial of the flat abdomen protruding double-slope house,based on the distribution law of the snow area of the house,three kinds of analysis models and the division of the roof are designed.The wind direction angle is 0°,45°,90°,135°,180°,wind speed drift of 195 kinds of working conditions with wind speeds of 5m/s,7.5m/s,10m/s,12.5m/s,15m/s,and roof slope angles of 20°,31° and 40°.The numerical simulation analysis of the motion obtained the distribution law of wind-induced snow drift on the surface of the house under various working conditions and the snow distribution coefficient of each zone available for snow resistance design.The results show that:with the increase of simulation time,the degree of snow erosion in all zones generally increases,the performance in the windward area is more obvious,and the leeward area is relatively moderate,indicating that the snow distribution in the windward area is more effective than the wind in the leeward area.Sensitive;detailed partitioning of the roof of the house can better reflect the distribution characteristics of the snow along the length of the ridge.The distribution coefficient of the snow in the middle of the roof after the partition is more than 9%than the non-partition.If the roof is not partitioned,the snow is covered.The coefficient value is not conducive to the safety and economy of the load design.Therefore,for the snow-sensitive structure,the roof should be partitioned to reveal its unfavorable snow distribution;when the single-span double-slope house contains the transitional area of the abdomen,it will Increase the accumulation of snow in the leeward area,and the abdominal bumps have obvious influence on the main structure.If only the snow coefficient of the single-span double-slope house is designed,there is a safety hazard,and the designer should pay attention to it.