Investigation Of Control Of Wind-induced Vibrations Of Tensioned Membrane Structures

Membrane structure is characterized mainly by lightweight and small-stiffness, so wind load is the decisive load in the design of membrane structures. In recent years many membrane structures suffered storm damage at home and abroad, thus it’s significant to improve the wind resistance performance of membrane structures by taking effective control measures. Based on CFD numerical simulation technique and wind tunnel test, the wind-induced vibration control problem of one-way and saddle-shaped tensioned membrane structures has been explored in this paper.Firstly, research methods and control methods of this paper were introduced. One-way tensioned membrane structure can simplify the two-dimensional structure, thus CFD numerical simulation technique is used to study it, while saddle-shaped tensioned membrane structure is a three-dimensional structure, because of the limitation of CFD numerical simulation technique, wind tunnel test is used to study it. At present there are mainly three ways to improve the wind resistance performance of engineering structures, namely aerodynamic measures, structural measures and energy dissipation measures, the first two ways are feasible for membrane structures due to their characteristics. Then the maximum displacement and the peak pressure reduction factors are put forward as the control factors to quantitatively describe the effect of control measures.Secondly, based on the two-dimensional fluid-structure coupling numerical simulation technique, the influence of different control measures on one-way tensioned membrane structure such as setting guide plates and changing the pre-tension, the span, the initial shape was investigated, then the recommendations of wind-induced vibration control were proposed. The results showed that the maximum displacement was effectively reduced by increasing the pre-tension, reducing the span, taking the windward tilt or convex form on the membrane surface.In addition, taking cocave form over a certain span ratio or setting guide plates with a reasonable height could reduce the maximum displacement in a certain extent.Finally, based on rigid and aeroelastic models wind tunnel tests of the saddle-shaped tensioned membrane structure, the influence of different control measures on it such as setting guide plates or grilles and changing the pre-tension, the rise-span ratio was investigated from the angles of load distribution and displacement response, then the suggestions of wind-induced vibration control were proposed. Research showed that increasing pre-tension or rise-span ratio could decrease maximum displacement in most cases. And using additional aerodynamic devices mainly decreased the peak pressure on the windward corners or edges, but only suspended guide plate was effective on controlling the maximum displacement, the other kinds of guide plates and grilles had little effect.