The air gap response of a specific semi-submersible platform subjected to irregular waves is considered. Detailed model tests for this structure are studied in depth. Using time-histories of both motions and air gap, statistical analyses both for the absolute near-structure wave elevation (with respect to a fixed observer), and the relative wave elevation (with respect to the moving structure) are performed. Statistics of wave crest amplification, due to diffraction, are established. Corresponding amplification factors are derived from linear diffraction theory, and the results of theory and observations are critically compared.
Issue Section:
Technical Papers
1.
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2.
Manuel, L., and Winterstein, S., 1998, “Estimation of Airgap Statistics for Floating Structures,” Tech. Rep. TN-4, Reliability of Marine Structures.
3.
Fokk, T., 1995, “Veslefrikk B Air Gap Model Tests,” Tech. Rep. 512167.00.01, MARINTEK Trondheim, Norway.
4.
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.
5.
Stansberg, C. T., 1999, “Nonlinear Air-Gap System Identification from Model Tests,” Proc., 9th ISOPE Conference. Brest, France.
6.
Jha, A. K., 1997, “Nonlinear Stochastic Models for Loads and Responses of Offshore Structures and Vessels,” Ph.D. thesis, Stanford University, Stanford, CA.
7.
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.
Copyright © 2001
by ASME
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