Research On The Interference Effect Of Wind-induced Snow Drift On Arched Roo

Light steel arched roofs are common forms of large span structures due to their fast construction and low cost,but their high structural sensitivity to wind and snow makes them susceptible to unbalanced snow distribution leading to structural collapse.The formation of unbalanced snow loads is closely related to the wind field around the building,the shape of the building and the disturbance effects of the surrounding buildings,as they severely influence the structure of turbulence and the process of snow drift.In order to study the law of wind-induced snow drift in gable roofs to reduce the occurrence of wind and snow disasters,this paper uses CFD numerical simulation to investigate the form of snow distribution in gable roofs.The main research work is as follows:(1)Establish numerical simulation model and method.This paper is based on the basic theory of two-phase flow and the assumption of Euler-Euler(Euler-Euler)method,using UDF secondary development to define the nature of wind and snow and consider the impact of snow on the air phase by considering the relative velocity between wind and snow to improve the accuracy of numerical simulation.In this paper,three typical conditions are selected: snow distribution around the snow barrier,snow distribution around a single cube flat roof and snow distribution on top of a high and low roofed building,and the simulation results are compared with the corresponding classical measured data and numerical simulation results.The reliability of the numerical simulation model and method in studying the effect of wind-induced snow drift on the roof of the target building is verified.(2)Numerical simulation study of snow distribution on single gable roofs.In this paper,the proposed numerical simulation model and method are used to study the windinduced snow drift of a single gable roof under five wind speeds,seven wind angles and five vector-span ratios,and through the analysis of the snow distribution and friction velocity of the gable roof,the most unfavorable working conditions of the single gable roof and the value of the snow distribution coefficient are proposed.(3)Numerical simulation study of snow distribution of two unequal height arched roofs.Based on the most unfavorable working conditions of single gable roof,this paper establishes 89 interference conditions by fixing the target building and changing the position of the disturbed building,and studies the snow distribution law on the top of the gable roof when the two unequal height gable roof buildings are arranged in series,parallel and staggered,and investigates the interference effect between the two unequal height gable roofs.