Research Article
Nov 1971
Laboratory Study of Lift Forces on Circular Piles
Publication: Journal of the Waterways, Harbors and Coastal Engineering Division
Volume 97, Issue 4
Abstract
Ocean waves exert lift (i.e. transverse) forces on piles under some circumstances in addition to the longitudinal forces. The lift forces are related to the formation and shedding of the eddies. The lift forces were found to be as great as 60% of the longitudinal forces. The Keulegan-Carpenter number is found to be a reasonable parameter to determine the regime in which eddies form, and to be related to the ratio to the lift to longitudinal forces. Eddies form in the lee of a vertical cylindrical pile subject to water waves when the Keulegan-Carpenter number has a value of about 3. For higher Keulegan-Carpenter numbers two eddies are developed and shed and the lift force is more or less regular with a frequency twice the frequency of the waves. For further increase in the Keulegan-Carpenter number, turbulence develops and the lift forces show a random pattern. The ratio of the lift to the longitudinal forces appears to be at a maximum for a Keulegan-Carpenter number of about 15.
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Published In
Journal of the Waterways, Harbors and Coastal Engineering Division
Volume 97 • Issue 4 • November 1971
Pages: 595 - 614
Copyright
© 1971 American Society of Civil Engineers.
History
Published in print: Nov 1971
Published online: Feb 12, 2021
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Authors
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Devidas D. Bidde, AM.ASCE
Sr. Engr., Howe (India) Pvt. Ltd., New Delhi, India; formerly, Res. Asst., Univ. of California, Berkeley, Calif.
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