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AEROELASTIC BEHAVIOUR OF BRIDGES SUBJECTED TO WIND FLOWS

DOI: 10.1615/ICHMT.2009.CONV.960
11 pages

R. Belakroum
URCA/GRESPI/Laboratoire de Thermomécanique, Faculté des Sciences, France; and Laboratoire LEAP, Université Mentouri, Constantine, Algeria; Universitй Kasdi Merbah, Ouargla, Algeria

Ton Hoang Mai
Laboratoire GRESPI - Thermomécanique, Faculté des Sciences PB1039, 51687 Reims, France

Mahfoud Kadja
Constantinel University, Laboratory of Applied Energetics and Pollution, Faculty of Technology Sciences, Department of Mechanical Engineering, Constantine 25000, Algeria

K. Zibouche
Centre Scientifique et Technique du Batiment, 84, AV. J. Jaures PB02, 77421, Marne-La-Vallée Cedex 2, France

Résumé

The aim of this subject is to predict numerically the aeroelastic behavior of bridges. This work deals with approximation of the interaction of two-dimensional incompressible viscous fluid and a vibrating bridge section. In this study we present an efficient algorithm aiming to predict the dynamic coupled behavior of structures in high-speed turbulent wind flows. To mathematically describe the fluid flow in computational deformed domain due to bridge section motion, we use the Navier-Stokes equations in the arbitrary Lagrangian-Eulerian (ALE) description. A numerical scheme used for unsteady flow simulations is implemented in a form satisfying the geometric conservation law (GCL). For turbulence modeling, we adopt the Large Eddy Simulation (LES) method using the Smagorinsky model. The structure sub-system is modeled as a spring supported rigid body. The resulting non-linear strongly coupled system is solved by the use of finite element method and a relaxed Bloc Gauss-Seidel method.
The obtained results for different Reynolds numbers -for flow around sections of bridges and the aeroelastic response of the solid structure- show a good agreement with available experimental and numerical results.

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