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TECHNICAL PAPERS

Air Gap Response of Floating Structures: Statistical Predictions Versus Observed Behavior

[+] Author and Article Information
Steven R. Winterstein, Bert Sweetman

Civil and Environmental Engineering Department, Stanford University, Stanford, CA 94305

J. Offshore Mech. Arct. Eng 123(3), 118-123 (Mar 20, 2001) (6 pages) doi:10.1115/1.1377867 History: Received March 10, 2000; Revised March 20, 2001
Copyright © 2001 by ASME
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References

Ude, S., Kumar, T. C., and Winterstein, S., 1995, “TFPoP 2.0: Stochastic Response Analysis of Floating Structures Under Wind, Current, and Second-Order Wave Loads,” Tech. Rep. RMS-18, Reliability of Marine Structures.
Manuel, L., and Winterstein, S., 1998, “Estimation of Airgap Statistics for Floating Structures,” Tech. Rep. TN-4, Reliability of Marine Structures.
Fokk, T., 1995, “Veslefrikk B Air Gap Model Tests,” Tech. Rep. 512167.00.01, MARINTEK Trondheim, Norway.
American Petroleum Institute, 1993. Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms—Load and Resistance Factor Design 2A-LRFD (RP 2A-LRFD), 1st Edition.
Stansberg, C. T., 1999, “Nonlinear Air-Gap System Identification from Model Tests,” Proc., 9th ISOPE Conference. Brest, France.
Jha, A. K., 1997, “Nonlinear Stochastic Models for Loads and Responses of Offshore Structures and Vessels,” Ph.D. thesis, Stanford University, Stanford, CA.
WAMIT 4.0, 1995. WAMIT: A Radiation-Diffraction Panel Program for Wave-Body Interactions-User’s Manual. Department of Ocean Engineering, M.I.T., Cambridge, MA.

Figures

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Plan view of Veslefrikk platform and location of air gap probes
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Concurrent crest data; location 7 (platform center)
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Concurrent crest data; location 5
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Concurrent crest data; location 1
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Ordered (fractile) crest data; location 7 (platform center)
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Ordered (fractile) crest data; location 5
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Ordered (fractile) crest data; location 1
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Theory versus data: absolute wave amplification
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|Hnet(T)|=amplitude of transfer function from input undisturbed wave to output net wave ηnet in the presence of the structure. Predictions are from first-order diffraction analysis.
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Theory versus data: relative wave amplification
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Comparison of observed and predicted heave motion spectra

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