The Response Analysis Of The Tensioned Membrane Structure Combined With Wind And Rain

With the development of the global economy,the large span buildings were used more and more.Because of the light weight,beautiful shape,large span,short construction period,etc.,the membrane structures were widely used.Because of these characteristics,the membrane structures have big flexibility and were sensitive to wind load.So the wind must be considered in the design of membrane structure.But in practice,strong winds and heavy rains often came together.Only considering wind in design,some phenomenon will appear that the membrane damaged even if not reach the design wind load.The reason is that rain can change the wind field of the membrane.This is a new problem for membrane structure design.According to this phenomenon,the tensioned membrane structure along with wind and rain were studied in this paper.Firstly,the principles of computational fluid dynamics and its solution process were introduced,including the governing equations of fluid,turbulence model,computational domain discretization and discrete equation solution.Comparing several turbulence models,a turbulence model(Realizable k-?)was determined.Next,the simulations of the wind field around the saddle shaped membrane structure under four wind direction angles were analyzed.The wind pressure distribution laws were obtained.The results show that under the wind direction angles 45,the positive and negative pressure coefficients of the membrane surface are all reached the maximum.Finally,based on the multiphase flow theory,the Euler-Euler method was used to express the combined action of wind and rain.Considering the raindrops on the influence of wind field and the effect of wind drive rain,the pressure distribution of the membrane surface and the structural response were received.The results show that the pressure coefficient,displacement and stress value of the membrane surface are all increased and increased with the increasing of wind speed and rainfall.At the same time,the structure is the most sensitive in 45 wind angle.