Vortex-Induced Vibration Performance and Suppression Mechanism for a Long Suspension Bridge with Wide Twin-Box Girder
Publication: Journal of Structural Engineering
Volume 144, Issue 11
Abstract
This study investigates the vortex-induced vibration (VIV) behavior of a twin-box girder bridge by means of aerodynamic sectional wind tunnel test and particle image velocimetry (PIV) measurements. The effect of grid plates on suppressing the VIV of twin-box girder model is examined and the influence of four design parameters of grid plates [porosity, flat plate width (FPW) ratio, composition type, and installation position] is studied. The primary causes of VIV and the suppression mechanism of grid plates are discussed in detail. It is found that torsional VIV is more vulnerable to the change in wind attack angle than is vertical VIV. The installation of grid plates noticeably suppresses the VIV of test model and its effect depends on the variation of different design parameters. For the porosity and FPW ratio, there is an optimal range in which the improvement of VIV suppression is more significant; the optimal value of porosity is about 42%–67%, and the optimal value of FPW ratio is about 0.042–0.167. Moreover, the uniform distribution of grid plates is more preferable in terms of suppressing VIV than is nonuniform distribution, whereas the installation of grid plates on the upper side leads to better performance of VIV suppression than does installation on the lower side. The primary cause of VIV of the twin-box girder is closely related to the formation of large-scale vortex shedding at the tail of the upstream box girder. The generation of large-scale vortex can be eliminated by appropriate selection of the design parameters of grid plates.
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Acknowledgments
The work described in this paper was fully supported by the National Natural Science Foundation of China (No. 51778545).
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Published In
Journal of Structural Engineering
Volume 144 • Issue 11 • November 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Aug 4, 2017
Accepted: May 8, 2018
Published online: Aug 23, 2018
Published in print: Nov 1, 2018
Discussion open until: Jan 23, 2019
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