Effects of geometry modification on the aerodynamics of a generic bridge deck section

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Abstract

This paper deals with a computational study of the aerodynamics of a generic bridge deck section under the action of lateral wind. The bridge section consists of a wide, thin deck on top of a girder box that has a shape close to a rectangle. In the prototype, the borders of the deck are shored by relatively slender beams, placed diagonally, and supported near the base of the girder box. Two two-dimensional, steady-state situations are addressed: section without shoring beams and section with solid panels along the plane of the shoring beams. The aerodynamic coefficients for drag, lift and moment are obtained for angles of attack in the range of –8° to +8°. The den Hartog criterion for galloping is also addressed. The code Fluent is used with the Spalart-Allmaras model for turbulence. The results for the first configuration show that a number of recirculation zones are formed below the deck, which have a large impact on the wind loading of the bridge. Lining the shoring with panels considerably reduces the importance of these recirculation zones, and the aerodynamic coefficients exhibit a more favourable trend against the angle of attack. Therefore, this geometry modifi­cation can be considered as a means of improving the aerodynamics of bridges without any major change to their structural design.
Original languageUnknown
Title of host publicationEccomas CFD - European Conference on Computational Fluid Dynamics
Pages11
Publication statusPublished - 1 Jan 2010
EventV European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010 -
Duration: 1 Jan 2010 → …

Conference

ConferenceV European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010
Period1/01/10 → …

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