Numerical Simulation Of Fluid-solid Interaction On Wind Induced Dynamic Response Of Membrane Structures

Membrane structure, a typical type of light-weight tension structures, is flexible in rigidity; Its membrane have no bending resistance and can only bear tension force. The structure resists applied loads via transforming its own shape, so the deformation of structure is quite notable. Besides, the rigidity of structure has strong correlation with its deformation, showing the perceptible feature of geometric nonlinearity. All these characteristics determine that membrane structure is very susceptible to wind loads. Many large scale membrane structures have collapsed in strong wind recent years. The wind-induced failure of membrane structures has aroused the wide attention of structural engineers and scholars in the world. Subjected to the fluctuating wind, the displacement, velocity and acceleration responses of the membrane unit in some particular segments are large enough to alter the surrounding wind flow significantly. Fluid-structure interaction (CFD) may probably results in the aeroelastic effect and dynamic buckling phenomenon.This paper deals with numerical simulation on fluid-structure effect of wind-induced vibration of flexible boundary membrane structure. The main work is as follow:The professional software of computational fluid dynamic CFX and the professional finite element software ANSYS are combined to simulate the wind-induced vibration of3D saddle-shaped membrane structure with flexible boundary, and the differences of wind pressure on structure surface with and without effect are illustrated.Through a number of numerical simulations on membrane structure with flexible boundary, the variables which influence the effect such as wind velocity and angle of direction wind are analyzed respectively by fixing any other variables, the influence rules of wind velocity and angle of direction wind are concluded in the end.