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Keywords: vortex-induced vibrations, fluid-structure interaction, lively footbridge, dynamic analysis, numerical method.

Summary

Multidisciplinary problems involving fluid-structure interaction are common in engineering design; in particular, vortex-induced vibrations of structures are of practical interest to many fields of engineering. A simplified numerical method is developed for its application in line-like structures. Navier-Stokes equations for incompressible flow have been solved in two dimensions in several transverse planes of the structure. Afterwards, the resultant pressure field is introduced using standard finite element interpolation techniques, together with the dynamic behaviour of the structure and its boundary conditions. For solving the fluid field, the fractional step scheme has been used, based on the second order pressure splitting scheme. In each fluid plane, the displacements have been taken into account considering an arbitrary Lagrangian Eulerian approach. The stabilization of convection and diffusion terms was achieved by means of orthogonal subscales assuming quasi-static subscales, that is, the temporal variation of subscales is negligible. In this simulation no turbulence model has been included. In order to solve the structural problem, a monodimensional model of thin wall section beam was considered and so the structure has been modelled with several beam elements. The standard second order Newmark method was used to included the dynamic behaviour equations. The method is applied to a stress ribbon with a narrow steel band footbridge. The wind has been considered to be an uncompressible fluid acting on the band in a series of planes that are considered independent among them, and perpendicular, or almost, to the footbridge. For each period of time, the fluid problem is solved, the aeroelastic analysis is carried out, and the geometry of the mesh of each fluid plane is updated according to the structure displacements. With these assumptions, wind-induced vibrations of the footbridge are analysed.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 94 PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON ENGINEERING COMPUTATIONAL TECHNOLOGY Edited by: Paper 164 Simulation of the Aeroelastic Response of a Stress Ribbon Footbridge using a Simplified Method A. Vasallo^1,2, M.V. Istrate¹ and A. Lorenzana^1,2 ¹Structural Design Area, CARTIF Centro Tecnológico, Valladolid, Spain ²Solid Mechanics and Structures Group, Escuela de Ingenierías Industriales, Valladolid, Spain doi:10.4203/ccp.94.164 purchase the full-text of this paper Full Bibliographic Reference for this paper A. Vasallo, M.V. Istrate, A. Lorenzana, "Simulation of the Aeroelastic Response of a Stress Ribbon Footbridge using a Simplified Method", in , (Editors), "Proceedings of the Seventh International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, UK, Paper 164, 2010. doi:10.4203/ccp.94.164 Keywords: vortex-induced vibrations, fluid-structure interaction, lively footbridge, dynamic analysis, numerical method. Summary Multidisciplinary problems involving fluid-structure interaction are common in engineering design; in particular, vortex-induced vibrations of structures are of practical interest to many fields of engineering. A simplified numerical method is developed for its application in line-like structures. Navier-Stokes equations for incompressible flow have been solved in two dimensions in several transverse planes of the structure. Afterwards, the resultant pressure field is introduced using standard finite element interpolation techniques, together with the dynamic behaviour of the structure and its boundary conditions. For solving the fluid field, the fractional step scheme has been used, based on the second order pressure splitting scheme. In each fluid plane, the displacements have been taken into account considering an arbitrary Lagrangian Eulerian approach. The stabilization of convection and diffusion terms was achieved by means of orthogonal subscales assuming quasi-static subscales, that is, the temporal variation of subscales is negligible. In this simulation no turbulence model has been included. In order to solve the structural problem, a monodimensional model of thin wall section beam was considered and so the structure has been modelled with several beam elements. The standard second order Newmark method was used to included the dynamic behaviour equations. The method is applied to a stress ribbon with a narrow steel band footbridge. The wind has been considered to be an uncompressible fluid acting on the band in a series of planes that are considered independent among them, and perpendicular, or almost, to the footbridge. For each period of time, the fluid problem is solved, the aeroelastic analysis is carried out, and the geometry of the mesh of each fluid plane is updated according to the structure displacements. With these assumptions, wind-induced vibrations of the footbridge are analysed. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £125 +P&P)
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