Research On Wind Pressure Characteristics Of Long-span Membrane Structures Considering Fluid-structure Interaction

Large span membrane structure is a typical wind load sensitive structure,wind load is the control load.Coefficient of wind load in the existing Chinese code does not apply to most membrane structure,the wind resistant design for large span membrane structure theory is not perfect,the fluid-structure coupling effect of wind and membrane structure became the wind-resistant design of membrane structure theory development bottleneck,is urgently needed to solve in the design of membrane structure wind resistance of important and difficult problem.Along with the development of architectural technology,exterior complex large-span membrane structure,membrane structure complex flow field distribution around the complex,exacerbated by the fluid-structure coupling effect of wind and membrane structure complexity,so the wind and complex large-span membrane structure of fluid-solid coupling effect,reveal the complex membrane structure under wind load of wind pressure distribution characteristics,in improving the wind resistance design of membrane structure has a very important theoretical meaning and engineering practical value.In this paper,based on the computational fluid mechanics principle,wind load is studied by using numerical simulation means several kind of common complex long-span membrane structure of fluid-solid coupling effect,the specific research contents include:1,according to various complex shape that is commonly used in engineering large-span membrane structure,considering fluid-structure coupling is studied when the structure on the surface of the average wind pressure distribution characteristics.Complex large-span membrane structure of flow around and air force are complex,its core lies in turbulent flow,turbulent flow problem is also influence the membrane structure under wind load of fluid-solid coupling effect of important factor.Therefore,in this paper,the complex structure were studied using different turbulence models considering fluid-structure coupling effect of average wind pressure distribution characteristics,including the standard k-epsilon model was simulated,the RNG k-epsilon model,Realizable k-epsilon model,in different wind speed and wind direction Angle under the condition of the structure on the surface of the average wind pressure,and compared with wind tunnel test results,in this paper,the accuracy of the simulation result is verified;Select along the flow direction of wind,comparing the different distribution of measuring points to get the average wind pressure coefficient curve,and curve rule of wind pressure coefficient were analyzed,summarized the different shape complex large-span membrane structure of the average wind pressure distribution.2,using the method of linear regression models filter(AR)simulate the Davenport wind velocity spectrum,based on fluent software for complex shape large span under the influence of the membrane structure of pulsating wind response study.This paper get the following conclusion:1,the different shape complex membrane surface under different turbulence models fit roughly the average wind pressure coefficient distribution.Different wind speed on different shapes roof surface wind pressure distribution of also do not have much impact.The saddle roof under different wind Angle of wind pressure distribution rule are greatly influenced by wind direction Angle.And are more likely to influence the effects of the vortex flow,wind pressure coefficients are negative.Continuous arch roof surface in 0° Angle of wind direction wind pressure distribution of the roof shape and little influence on spiral effect.But in the Angle of 90° direction under the action of wind pressure coefficient distribution on surface of the roof structure has enormous influence on the surface shape.Undulating roof under the effect of 0 °direction Angle and continuous arched roof influenced by coming flow basic same,but in the end of the roof surface under the influence of drafting generate large spiral effect.Angle of 90 °direction of undulating roof surface is also affected by the surface shape of the roof is great,wind pressure distribution along with the roof surface shape and produce obvious changes.Undulating roof and continuous arched roof surface over local positive pressure is produced.2,according to the three dimensional space related pulsating wind speed density spectrum of fluctuating wind come three kinds of complex shape large span structure under the action of wind pressure change rule.