Numerical Simulation Of Fluid-Structure Interaction For Wind-induced Response Of High-rise Steel Structures

High-rise steel structure is somewhat different from others because of being high, light, soft and slim. Due to its characteristic of shape, the dominating load of high-rise steel structure is wind load. With the progress and development of technological level and construction technique, it has been developed to be much higher, lighter and softer whose natural frequency is even closer to wind's dominant frequency. Therefore its sensitivity to wind load increases and its dynamic response to wind load is more complicated. So it is essential to carry out further study on the wind-induced response of high-rise steel structure in the field of engineering and research.The numerical simulation analysis of fluid-structure interaction (FSI) of high-rise steel structure 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 incompressible viscous Navier-Stokes equations are assumed in the flow 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.Three-dimensional flow passing by the high-rise steel structure is simulated with five turbulence models:standard k-εmodel, RNG k-εmodel, Wilcox k-ωmodel, SST k-ωmodel, and LES model. Numerical simulation results demonstrate LES model is more suitable for the wind-resistant analysis of high-rise steel structure. Hence, LES model is adopted to make a further analysis of the wind-induced response of high-rise steel structure.For studying the wind-induced response of high-rise steel structure, the tall steel sail located at the top of Li Qimao Museum is chosen as the engineering background. Numercial simulation analysis is performed by establishing the rigid and aero-elastic models. By the numerical simulation results, we can obtain the coefficient of wind pressure distribution of high-rise steel structure, the coefficient of wind load shape and wind vibration coefficient, which provide reference for designers.