Wind Tunnel Sectional Tests For The Identification Of Flutter Derivatives And Vortex Shedding In Long Span Bridges
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J. Á. Jurado, R. Sánchez & S. Hernández
Wind tunnel sectional tests for the identification of flutter derivatives and J. Á. Jurado, R. Sánchez & S. Hernández School of Civil Engineering, University of Coruña, Spain Abstract Aeroelastic phenomena are of major concern for design of long span bridges. Flutter is a critical condition that can be computationally evaluated with a previous identification of 18 functions which relate forces with movements. These functions are called flutter derivatives, which can be extracted by means of a free vibration sectional test of the deck considering three degree of freedom. Two different identification methods are used: Modified Ibrahim Time Domain, and Iterative Least Squares. On the other hand, vortex shedding excitation is an aerodynamic effect which frequently occurs to cable supported bridges. It is due to synchronization of the frequency of the alternating vortices shed from the deck and one of the natural frequencies of the structure. Both phenomena have been studied using a sectional model with a shape similar to the Great Belt Bridge deck. Keywords: flutter derivatives, vortex shedding, bridges, sectional models, wind tunnel.
flutter derivatives, vortex shedding, bridges, sectional models, windtunnel.