Vortex-Induced Dynamic Response Analysis for the Submerged Floating Tunnel System under the Effect of Currents
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 139, Issue 3
Abstract
This paper describes an investigation of vortex-induced vibrations in a submerged floating tunnel (SFT) system. A theoretical model for coupled tube-cable vibration was developed to evaluate the SFT structural dynamic response to water current. The differential equations of the cable and tube coupled motion were derived using the Hamilton principle, and approximate numerical analyses were carried out to determine the coupling effect between cable transverse vibrations and tube vertical vibrations. The results showed that the maximum amplitudes of the cables were greater than the initial disturbance when self-induced resonance occurred. Self-induced resonance can be caused by the vortex-induced vibration of the cables when the flow velocity reaches a certain value. The change in the tube-specific gravity ratio had little effect on the maximum vibration amplitudes of the tube and cables. The vibrations of the tube and cables were more sensitive to changes in the lift coefficient than to the added mass coefficient or the drag coefficient. The coupling effect of tube-cable vibration should be weaker with smaller cable angles; after careful consideration, a reasonable choice of angle for the cables was determined to be 45°.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China under the project “Coupled vibration effect and experimental research of tubular segment and anchor cables in the Submerged Floating Tunnel under current” (Grant No. 51279178, website http://isis.nsfc.gov.cn/portal/Proj_List.asp).
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Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 139 • Issue 3 • May 2013
Pages: 183 - 189
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Sep 27, 2011
Accepted: Jun 6, 2012
Published online: Jul 28, 2012
Published in print: May 1, 2013
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