Research On Wind Pressure Characteristics Under Vertical Wind Loading Of Membrane Structures Considering Fluid-structure Interaction

The membrane structure has the characteristics of light weight,small rigidity and strong flexibility.Wind load is the control load of membrane structure,and it is also an important reason leading to the destruction of membrane structure.At present,the domestic wind resistant design theory of membrane structures is not mature,the current specification does not load pressure coefficient parameters of membrane structure clear,the effects of wind and membrane structure of the fluid solid coupling is an important cause of lagging behind the wind resisting design of membrane structures theory,the fluid solid coupling effect is an important factor that cannot be neglected in the design of membrane structure and wind.The natural wind contains both horizontal wind and vertical wind,in which the horizontal component is much larger than the vertical component.But for the membrane structure of flexible structure that,under the action of horizontal wind,the response of the structure is perpendicular to the surface of the structure,close to the vertical structure in the direction of response;and under the action of vertical wind direction and response caused by the horizontal wind,vertical wind and wind vibration will increase the response of the whole structure,risk and increase the membrane structure damage.Therefore,the vertical wind can not be neglected in the wind resistant design of membrane structures,but the research on the vertical wind is very limited in the wind resistant studies of membrane structures.To this end,the fluid solid coupling effect is considered in this paper,the study on wind pressure characteristics of membrane structure in the vertical wind load,wind resistant design for theory of membrane structure,for the engineering practice to provide more reliable evidence for wind resistant design is very important.In this paper,based on computational fluid dynamics theory,the numerical simulation technology,long-span membrane structure of three kinds of shapes are adopted in engineering,considering the different shapes of the membrane structure of FSI in vertical wind load,mean wind pressure and wind-induced response.The main contents of this paper are as follows:1.Large span membrane structure selected wave shaped,saddle shaped and continuous arched three forms as the research object,select the RNG k-? turbulence model and Simulation of different wind speed and direction angle of the 27 conditions,considering the average wind pressure distribution in the vertical wind under the action of the membrane structure of FSI,obtained the law of wind pressure the distribution of the surface of the roof of each kind ofoperating mode,comparison of membrane structure and level of wind pressure and wind loads distribution were obtained,the average wind pressure distribution of different shapes of membrane structures under the action of vertical wind.2.Consider fluid solid coupling,the wind effect of long span membrane structure of wave shaped,saddle shaped and continuous arch three kinds of load fluctuation in the vertical response of the wind.First,using the autoregressive(AR)algorithm,using MATLAB according to panosky wind spectrum to simulate the fluctuating wind speed,then the wind speed through the UDF interface into fluent,obtained the most unfavorable wind direction,wind-induced vibration of membrane structure of three kinds of the shape of the response of different wind speed,and the fluctuating wind pressure partition the coefficient of different shape membrane structure.