The Research On Property Of Air-inflated Membrane Structure Based On The Fluid-structure Method

After nearly ten years of development, the basic theories of the tension structure have been available for a number of scientists, but for the air-inflated membrane structure there are some problems having not been resolved yet, such as static analysis, dynamic analysis and solid-fluid interaction analysis under wind load, the first two of which are concerned by this paper.This paper presents a coupled fluid-structure equation based on the potential fluid theory, and use finite element software ADINA to build the model of air-inflated membrane structure. The paper gives results of spherical air-inflated membrane structure compared with the analytical results, which verifies the validity of the method proposed. After that, the paper proceeds form-state analysis, and several case of static analysis of one air-inflated membrane structure of National Swimming Center, and gives changing rules of working pressure and stress under different static loads, as well as the inflection of initial working pressure and external load to the displacement and stress of membrane surface. Then the paper conducts Modal Analysis to the model proposed ahead, and concludes the infection of initial working pressure to the modals. The fluctuating wind speed with Davenport Spectrum is generated, and the pressure coefficients of structure are gotten by using Computational Fluid Dynamics method. The air-inflated membrane structure under the wind load is analyzed, and its performances under the dynamic wind load are discussed.To sum up, the paper uses finite element method based on the fluid-structure theory to perform the form-state analysis, static analysis and modal analysis, as well as the wind load analysis of the air-inflated membrane structure, to give some references of the wind resistant design of such structure in future.