Wave Forces on an Offshore Gravity Platform
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 112, Issue 2
Abstract
Because a gravity structure is placed on the ocean floor it is important to investigate the effect of the water pressure on the bottom of the pads of the structure. Any communication between the underneath of the structure and outside will introduce pressure through scouring or porous foundation which will alter the vertical force and overturning moment on the structure due to waves. The effect of the bottom pressure on these quantities is investigated in a test with a gravity drilling platform model in which both pressures and forces were measured. It is shown from experimental and computed results that while the bottom pressure will substantially alter the vertical force, its effect on the overturning moment is also significant. Moreover, for a structure resting on pads with a small gap between the pads and the floor it is found that the bottom pressure can be estimated from the pressure outside the pads with reasonable accuracy.
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References
1.
Chakrabarti, S. K. (May, 1980). “Inline Forces on Fixed Vertical Cylinder in Waves.” J. Waterway, Port, Coastal, and Ocean Div., ASCE, Vol. 106, 145–155.
2.
Chakrabarti, S. K., Wolbert, A. L., and Tam, W. A. (1977). “Wave Forces on Inclined Tubes.” Coastal Engineering, The Netherlands, Vol. 1, 149–165.
3.
Chakrabarti, S. K., and Naftzger, R. A. (May, 1976). “Wave Interaction with a Submerged Open‐Bottom Structure.” Proceedings of the Eighth Offshore Technology Conference, Houston, TX, OTC 2495, 109–122.
4.
Garrison, C. J., and Stacey, R. (1977). “Wave Loads on North Sea Gravity Platforms: A Comparison of Theory and Experiment.” Proceedings of Offshore Technology Conference, OTC 2794, Houston, TX.
5.
Garrison, C. J. (1978). “Hydrodynamic Loading of Large Offshore Structures, Three‐Dimensional Source Distribution Methods.” Numerical Methods in Offshore Engineering, John Wiley & Sons, Inc., Great Britain, 87–140.
6.
Kokkinowrachos, K., and Asorakos, S. (Feb., 1985). “Hydrodynamic Analysis of Large Offshore Structures on Porous Elastic Seabed.” Proceedings, Fourth international Symposium on Offshore Mechanics and Arctic Engineering, Dallas, TX.
7.
Mei, C. C., and Foda, M. A. (1981). “Wave Induced Responses in a Fluid‐Filled Poro‐Elastic Solid with a Free Surface—A Boundary Layer Theory,” Geophysical Journal, Royal Astronomical Society, Vol. 66, 597–637.
8.
Morison, J. R., O'Brien, M. P., Johnson, J. W., and Shaaf, S. A. (1950). “The Forces Exerted by Surface Waves on Piles.” Petroleum Transactions, AIME, Vol. 189, 149–157.
9.
Moshagen, H., and Monkmeyer, P. L. (1979). “Wave Induced Seepage Forces on Embedded Offshore Structures.” Civil Engineering in the Oceans IV, ASCE, Vol. II, 758–773.
10.
Sarpkaya, T., and Isaacson, M. de St. Q. (1981). Mechanism of Wave Forces on Offshore Structures. Von Nostrand‐Reinhold Co., Inc., New York, NY.
11.
Standing, R. G. (Feb., 1981). “Wave Loading on Offshore Structures: A Review.” National Maritime Institute, Report No. NMI R102, Feltham, Middlesex.
Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 112 • Issue 2 • March 1986
Pages: 269 - 283
Copyright
Copyright © 1986 ASCE.
History
Published online: Mar 1, 1986
Published in print: Mar 1986
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