Consider Fluid-structure Interaction Of Large-span Roof Structure Wind-induced Vibration Response Of The Numerical Simulation

Along with the development of science and technology, beautiful shapes and capacities of providing huge space without inner columns are traits of large-span roof structures. Then a number of large-span roof structures are widely applied to the public building, for example, gymnasium, hangar and theater. When large-span roofs tend to be more flexible and light, the wind loads, among all kinds of loads, become dominating. But the theories of wind-induced dynamic response and Equivalent Static Wind Load on large-span roofs aren't well developed and few Codes are presented to regulate the dynamic wind loads on large-span roofs all over the world. So it is significant to study wind loads and wind-induced dynamic response for large-span roof structures in the field of engineering and research.Numerical simulation analysis of fluid-structure interaction (FSI) of long-span roof structures is performed by ADINA to investigate the wind-induced dynamic response in this paper. Conservation laws of structural mass and momentum are expressed in the usual Lagrangian system of coordinates on a suitable form for geometrical nonlinearity problems, while conservation principles of fluid mass and momentum are described in the Arbitrary Lagrangian Eulerian (ALE) system of coordinates. The flow is modelled with the incompressible viscous Navier-Stokes equations and Large Eddy Simulation (LES) turbulence model. To avoid the numerical instability in the iterative solution, the 3D Flow- Condition-Based-Interpolation (FCBI) element is employed, which is an efficient stabilized finite element solution technique.Rise-to-span with 1/3,1/4,1/5,1/6 of single-layer spherical reticulated shell and rise-to-span with 1/2,1/3,1/4 of single-layer cylindrical reticulated shell are solved by ADINA. The trend and numerical value of wind pressure coefficient of the numerical simulation are close to that of wind-tunnel tests, which demonstrates that the wind-induced response of such structures can be simulated effectively. The results present the displacement wind-induce dynamic coefficient and pressure coefficient of large-span single layer reticulated shell change a little when the wind velocity varies. A full-scale model is employed when numerical simulation analysis of fluid-structure interaction (FSI) of canopy of Jinan railway station is performed. Rigid and aeroelastic models with billboard and without billboard are considered. The displacement wind-induce dynamic coefficient and pressure coefficient are obtained respectively and compared with the results of wind-tunnel tests. The results demonstrate that the wind pressure coefficient of model with billboard is larger than that of model without billboard obviously, which show that the billboard can reduce the wind pressure on the roof. The results between numerical simulation analysis and wind-tunnel tests of 90 and 270 degree wind attack angles are coincident, and the curve of numerical simulation almost locates the a verage line of wind-tunnel tests. The results of 0 and 180 degree wind attack angles have some differences which maybe due to their different surrounding environment (wind-tunnel test considers effect of surrounding structures while numerical simulation doesn't consider it).