Wind Tunnel Sectional Tests For The
Identification Of Flutter Derivatives And
Vortex Shedding In Long Span Bridges
Author(s)
J. Á. Jurado, R. Sánchez & S. Hernández
Abstract
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.
Keywords
flutter derivatives, vortex shedding, bridges, sectional models, windtunnel.
Related Book
Other papers in this volume
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