Stabilizing Winglet Pair for Slender Bridge Decks

by Jon D. Raggett, J. D. Raggett & Associates Inc, Carmel, CA, USA,



Document Type: Proceeding Paper

Part of: Bridges and Transmission Line Structures

Abstract:

This paper describes the effectiveness, as an aerodynamic damper, of a pair of winglets mounted parallel to, and clear from, bridge decks that might otherwise be aeroelastically unstable. The winglets typically are mounted above or below, and slightly outboard of, the bridge deck, and typically would have a chord dimension of ten percent or less of the bridge deck chord. They can be rigidly attached to the bridge deck or can be clipped to hangers if the bridge is a suspension bridge. If the winglet pair is sufficiently removed from the bridge deck, the aerodynamic flutter coefficients of the winglet pair can be determined theoretically, and then superimposed upon the aerodynamic flutter coefficients for the bridge deck section. Comparisons between theory and experiment are made.

Subject Headings: Bridge decks | Suspension bridges | Aircraft wings | Aerodynamic flutter | Aeroelasticity | Aerodynamics | Wind tunnel

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