Bridge Flutter Derivatives at Vortex Lock-In
Publication: Journal of Structural Engineering
Volume 124, Issue 4
Abstract
Many structures with extended spans undergo the flow-induced oscillation commonly called vortex shedding. In the case of long-span bridges, Ehsan and Scanlan, employing basic data from deck section wind tunnel model tests, offered a nonlinear theoretical framework for predicting maximum vortex-induced amplitude under the lock-in condition. The present paper replaces the Ehsan-Scanlan model with a linearized form that brings it into conformity with the familiar flutter derivative expressions now commonly used in bridge wind-stability analyses. The essential new addition is an active sinusoidal lift term. Converting some of the Ehsan-Scanlan experimental section data to the new form, the suggested replacement model successfully reidentifies the range of original Tacoma Narrows vortex-induced response amplitudes that were experimentally obtained by Farquharson on a full-bridge model. Either vertical or torsional motions at vortex lock-in can be assayed by the method discussed.
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References
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 124 • Issue 4 • April 1998
Pages: 450 - 458
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Apr 1, 1998
Published in print: Apr 1998
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