Considering The Fluid-structure Interaction Of Wind-induced Vibration Response Of The Membrane Structure Wind Resistant Design

Membrane structures are widely used in Civil Engineering nowadays as a new type of spacial structures. Because of the characteristics of lightweight, large-span and flexible, membrane structures are adaptive to earthquakes but are susceptible to wind-induced dynamic excitation. Seen from the research actuality in the world at present, there are few studies on wind-induced vibration analysis for membrane structures, especially with considering FSI (Fluid-Structures Interaction). So carrying out further studies on the wind-induced dynamic response problem of membrane structures is significant for the analysis of wind load and engineering design.In this paper, based on the theoretical frame of ADINA and according to the characteristic of FSI (Fluid-Structures Interaction) for analyzing wind-induced dynamic response of tension membrane structures, the governing equations of fluid in the FSI system using ALE (Arbitrary Lagrangian-Eulerian) description and the governing equations of structures using TL (Total Lagrangian) description are proposed. The corresponding boundary conditions and interface coupling conditions are given as well. The flow is modeled with the incompressible viscous Navier-Stokes equations and standard k -ω turbulence model.At first, the wind-induced dynamic response numerical simulation of the large cantilevered roof of Changshu Stadium used ADINA is carried out in this paper and the wind pressure distribution coefficients are obtained. The comparision of the wind pressure distribution coefficients of numerical simulation with the results of the wind tunnel test shows that the distribution rules are almost consistent with each other and the values are coincided well except for the place near the back edge of the roof. On the whole, numerical simulation method as a brief, quick and low-cost tool used for wind load analysis of complicated structures is feasible.Then systemic FSI wind-induced dynamic response numerical simulations of three classical shapes of tension membrane structures included saddle-shaped, conical and wave-shaped membrane structures are performed using ADINA software, and the effects of some parameters such as inlet velocity, wind direction, span, rise-span ratio, tension stiffness and pre-stress of membrane are considered. The rules of FSI numerical simulation for wind-induced dynamic responses of the three types of membrane structures are summarized and the wind-induced dynamic coefficients and the wind pressure distribution coefficients are obtained which can be used in the design of membrane structures. The results show that wind direction and rise-span ratio are two important parameters whose effects are complex, and they have different influences on the wind-induced dynamic response for the three types of tension membrane structures. The rise-span ratio is primary parameter for wave-shaped membrane structures, and each type of tension membrane structures has its most disadvantageous wind direction.