Measured and Predicted Wave Forces on Offshore Platforms
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 117, Issue 5
Abstract
Measured wave force data from the Conoco test structure in hurricane Carmen have been analyzed on a wave‐by‐wave basis to determine the total hydrodynamic forces exerted on the platform. These measurements are compared with calculated total forces. The calculated forces are based on a conventional API wave‐current force determination procedure. Observations made on the basis of the Conoco test structure (CTS) data are compared with those from the Exxon ocean test structure (OTS). The comparisons indicate that the two data sets indicate similar trends if it is recognized that in contrast with the CTS data, the OTS data did not involve high storm waves; that these waves were long‐crested and unidirectional; and that there were no significant currents. The data indicate that the present API RP 2A guideline wave‐force formulation will given an unbiased estimate of maximum total hydrodynamic forces developed on small‐diameter membered structures located in deep water in intense hurricanes. Directional spreading associated with the intense, central portions of hurricanes can lead to substantial reductions in wave forces, as compared with unidirectional waves of identical heights and periods.
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References
1.
Bea, R. G. (1974). “Updating of wave height and platform resistance descriptions based on preliminary data from hurricane Carmen.” Rep. Amer. Petrol. Inst., CE‐9 Report, Shell Oil Co., Houston, Tex.
2.
Bea, R. G. (1979). “Gulf of Mexico hurricane wave heights.” Proc. 6th Offshore Tech. Conf., OTC No. 2110, 2, 791–810.
3.
Bea, R. G., Lai, N. W., Niedoroda, A. W., and Moore, G. H. (1989). “Gulf of Mexico shallow water wave heights and forces.” Proc. 15th Offshore Tech, Conf., OTC 4586, 3, 49–68.
4.
Bea, R. G., Wright, S. G., Sircar, P., and Niedoroda, A. W. (1986). “Wave‐induced slides in South Pass Block 70, Mississippi Delta.” J. Geotech. Engrg., ASCE, 109.
5.
Bendat, J. S., Richman, G., Osborne, A. R., Silbert, M. N. (1979). “Cross‐spectral and coherence analysis of OTS data,” Proc. Civ. Engrg. Oceans IV, 2, ASCE, 774–790.
6.
Borgman, L. E., and Yfantis, E. (1979). “Three‐dimensional character of waves and forces.” Proc. Civ. Engrg. Oceans IV, 2, ASCE, 791–804.
7.
Dean, R. G. (1977). “Hybrid method of computing wave loading.” Proc. 9th Offshore Tech. Conf., Paper No. 3029, 483–492.
8.
Dean, R. G., Lo, J.‐M., and Johansson, P. I. (1979). “Rare wave kinematics vs. design practice.” Proc. Civ. Engrg. Oceans IV, 2, ASCE, 1030–1049.
9.
Forristall, G. Z. (1974). “Three‐dimensional structure of storm generated currents.” J. Geophys. Res., 79(18), 101–123.
10.
Forristall, G. Z. (1981). “Kinematics of directionally spread waves.” Proc., Directl. Wave Spectra Applicats., ASCE, New York, N.Y., 129–146.
11.
Forristal, G. Z., Ward, E. G., and Cardone, V. J. (1980). “Directional wave spectra and wave kinematics in hurricanes Carmen and Eloise.” Proc. 17th Coast. Engrg. Conf., ASCE, New York, N.Y., 567–586.
12.
Haring, R. E., Olsen, O. A., and Johansson, P. I. (1979). “Total wave force and moment vs. design practice.” Proc. Civ. Engrg., Oceans IV, 2, ASCE, New York, N.Y., 805–819.
13.
Haring, R. E., and Spencer, L. P. (1979). “The ocean test structure data base.” Proc. Civ. Engrg., Oceans IV, 2, ASCE, New York, N.Y., 669–683.
14.
Heideman, J. C., Olsen, O. A., and Johansson, P. I. (1979). “Local wave force coefficients.” Proc. Civ. Engrg., Oceans IV, 2, ASCE, New York, N.Y., 684–699.
15.
King, J. R. (1971). Probability charts for decision making. Industrial Press Inc., New York, N.Y., 66–81.
16.
Lee, G. C. (1981). “Development of fixed‐leg platform technology.” Safety and offshore oil: Background papers of the Committee on Assessment of Safety of OCS Activities, Marine Board, Assembly of Engineering, National Research Council, National Academy Press, Washington, D.C., 302–315.
17.
Litton, R. W. (1983). “Fatigue analysis of the Brent Field flare structure.” Proc. 2nd Intl. Offshore Mech. & Arctic Engrg. Symp., Houston, Tex., 784–802.
18.
Nath, J. H. (1987a). “Hydrodynamic coefficients for marine‐roughened cylinders.” Final Rep., Amer. Petrol. Inst., API Prac Project 85‐31, Dept. of Civil Engineering, Oregon State Univ., Corvallis, Oreg.
19.
Nath, J. H. (1987b). “On wave force coefficient variability.” J. Offshore Mech. Arctic Engrg., 109, 295–306.
20.
Nath, J. H. (1988). “Biofouling and Morison equation coefficients.” Proc., 7th Int. Offshore Mech. & Arctic Engrg. Symp., Houston, Tex., 481–490.
21.
Ohmart, R. D. (1984). “Hydrodynamic loading of steel structures.” J. Wtwy., Port, Coast., Ocean Engrg., ASCE, 110(4), 180–192.
22.
Ohmart, R. D., and Gratz, R. L. (1978). “A comparison of measured and predicted ocean wave kinematics.” Proc. Offshore Tech. Conf., Paper OTC 3276, Houston, Tex., 3, 1947–1957.
23.
Ohmart, R. D., and Gratz, R. L. (1979). “Drag coefficients from hurricane wave data.” Proc. Civ. Engrg., Oceans TV, 1, ASCE, 380–391.
24.
Ohmart, R. D., Gratz, R. L., and Mallery, G. O. (1970). “Instrumentation program for evaluation of offshore structure design.” Proc. Offshore Tech. Conf., Paper OTC 1264, Houston, Tex., 2, 391–396.
25.
“Recommended practice for planning, designing and constructing fixed offshore platforms.” (1991). API Recommended Practice 2A (RP 2A), 16th Ed., American Petroleum Institute, Dallas, Tex.
26.
Rodenbusch, G. (1986). “Random directional wave forces on template offshore platforms.” Proc., Offshore Tech. Conf., OTC Paper No. 5098, 1, 147–156.
27.
Sharma, J. N., and Dean, R. G. (1981). “Second‐order directional seas and associated wave forces.” J. Soc. Petr. Engrs., 129–140.
28.
Ward, E. G., Borgman, L. E., and Cardone, V. J. (1978). “Statistics of hurricane waves in the Gulf of Mexico.” Proc. 10th Offshore Tech. Conf., OTC No. 3229, 3, 1523–1536.
29.
Wilson, B. W. (1973). “Hindcast of deep‐water wave energy spectra for hurricane Audrey of 1957.” Proc. 5th Offshore Tech. Conf., OTC No. 1833, 2, 121–132.
Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 117 • Issue 5 • September 1991
Pages: 511 - 532
Copyright
Copyright © 1991 ASCE.
History
Published online: Sep 1, 1991
Published in print: Sep 1991
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