The Fluid-solid Coupling Response Analysis On Tensioned Membrane Structures Bearing With Wind And Rain

With the rapid development of global economy and technology,There is a growing demand for long-span buildings,The membrane structure is light in weight,beautiful in appearance and can realize long span,Therefore,it is widely used.The membrane structure is flexible and sensitive to wind loads.Therefore,the wind load must be considered as the control load in the design process.And with the use of the structure,Found that some tensioned membrane structures are far from meeting the design requirements when they are damaged.The reason lies in the fact that wind and rain often occur at the same time,and the interaction between wind and rain occurs at the interface of buildings,The original wind field has changed,Membrane structure is destroyed due to large deformation beyond its scope of use.In view of this,this paper studies the response of tensile membrane structure under the simultaneous action of wind and rain,Establish the model of wind and rain action,Consider the bidirectional Fluid-Structure/Solid Interaction,Analysis of structural response under the combined action of wind and rain,The research has certain guiding significance for membrane structure design.Firstly,the principle of using computational fluid dynamics(CFD)method to analyze the response of tensioned membrane structures is introduced,Select the FCBI-C unit to divide the grid,Using dynamic grid technology to solve the effective transmission of data in Fluid-Structure Coupling calculation to realize displacement coordination,Coupling calculation of tensioned membrane structure by iterative coupling algorithm;Then use MATLAB to simulate the wind speed time history curve,Superimposed rainfall onto wind speed time history curve,Get the wind and rain time curve,Response Analysis of Tensile Membrane Structure as Input Load;Finally,the finite element software ADINA is used to realize the shape finding,modal analysis and bidirectional fluid-solid coupling calculation of two saddle-shaped and umbrella-shaped tensioned membrane structures.In the calculation,the film surface with initial prestress of 2kN/m,1.45 kn /m and 1kN/m is formed by considering the change of membrane surface prestress,Simulated wind speeds of 13.8 m/s,20.7 m/s and 28.4 m/s,Wind direction Angle 0 degrees,45 degrees,90 degrees and other conditions of wind and rain time history curve.The results show that:(1)The saddle-shaped tensioned membrane structure is more sensitive to 45 degrees wind direction angle,At the same wind speed,the umbrella shape is more likely to be unstable than the saddle-shaped tension film structure deformation by about 47%;(2)Under the combined action of wind and rain,the wind speed influences the displacement at a certain time of rainfall.The displacement change rate of the saddle-shaped tension film at 28.4 m/s wind speed is 14.5% larger than that at 13.8 m/s wind speed,The displacement change rate of air suction zone of umbrella-shaped tensioned membrane structure increases by 25.5%;Affected by rainfall,when the wind speed is 13.8m/s,the displacement of the wind suction zone is greater than that of the wind pressure zone,When the wind speed is 20.7m/s and the rain reaches its extreme value,The displacement of the wind pressure zone begins to be greater than the displacement of the wind suction zone,When the wind speed is 28.4m/s,the rain reaches the time of heavy rain,The displacement of the wind pressure zone begins to be greater than the displacement of the wind suction zone.