Study On Wind Induced Response Of Tension Membrane Structures

Membrane structure is extremely wide applications in china in recent years, this kind of structure have elegant shape and outstanding seismic performance, so more and more young engineers love it. At the same time, because of this kind of structure is very sensitive to wind loads which is its control load, in view of membrane structure is novel,irregular,unique and flexible, there is not shape factor for every shape in load code, so different engineers would choose different shape factor. People study on membrane structure of the wind-induced vibration theory is not mature now, and more and more membrane structure accidents remind us to conduct deeply research about it.Numerical wind tunnel is studied by Fluent12.0 software base on CFD technique in this paper, the results show the feasibility of this method. Finally, saddle-shaped membrane and catenoid membrane and umbrella membrane are simulated by the way of numerical wind tunnel, then the shape factor zone of saddle-shaped membrane are divided, so we get shape factor which is used in project.According to the linear filter (AR) law theory and considering the temporal correlation and spatial correlation, fluctuating wind speed time is simulated by MATLAB language. At last, each parameter which determined accuracy and efficiency are studied.Saddle-shaped membrane is taken as example, vibration characteristics is analyzed. And the influence to pre-tension of membrane,pre-tension of cable,stiffness of membrane and span ratio are discussed.There have a nonlinear time history analysis to tensioned membrane by ANSYS software and the wind loads is got by numerical method. In view of the folds or relaxation of membrane is determined by membrane tension, the influence to pre-tension of membrane,pre-tension of cable,stiffness of membrane and span ratio are discussed in detail. And the folds, loose or damaged areas which maybe happened are discussed.The Expo Axis membrane is taken as example, a new method for random vibration analysis - the equivalent excitation method is used. This method take into account the advantages both time history analysis and random vibration analysis, and the computing is convenient and fast, and this method can be used in any structure compared with the pseudo excitation method, but there are the same exact theoretical solution and the higher efficiency, it is the same solution precision with traditional CQC method.