Structural reliability analyses of fixed marine platforms subjected to storm wave loading are performed to assess deck elevations. Platforms are modeled as a series system consisting of the deck and jacket bays. The structural reliability analyses are carried out assuming dominant failure modes for the system components. Upper and lower bounds of the probability of failure are computed. The variation of the reliability index per bay component as a function of wave height, with a focus on those wave heights that generate forces on the deck, is analyzed. A comparison is given for the deck probability of failure and the lower bound probability of failure of the jacket in order to assess how the deck or the jacket controls the probability of failure of the system. Results are also given for reliability analyses considering different deck elevations. Finally, an analysis of the total probabilities of failure, unconditioned on wave heights, is given.

R. G.
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Wave-in-Deck Forces on Offshore Platforms
ASME J. Offshore Mech. Arct. Eng.
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Botelho, D. L. R., Ullman, R. R., Chancellor, D. P., and Versowsky, P. E., 1994, “A Survey of the Structural Damage Caused by Hurricane Andrew on Some of the Platforms Located in the South Timbalier Area,” Proc. Offshore Technology Conference, Society of Petroleum Engineers, Richardson, Texas.
Marshall, P. W., and Bea, R. G., 1977, “Failure Modes of Offshore Platforms,” Proc. 1st Intl. Conference on Behavior of Offshore Structures, Vol. II, Trondheim.
Kaplan, P., Murray, J. J., and Yu, W. C., 1995, “Theoretical Analysis of Wave Impact on Platform Deck Structures,” Proc. Offshore Mechanics and Arctic Engineering Conference, ASME, Copenhagen.
Finnigan, T. D., and Petrauskas, C., 1997, “Wave-in-Deck Forces,” Proc. 6th Intl. Offshore and Polar Engineering Conference, ISOPE, Golden.
Tromans, P. S., and Van de Graaf, J. W., 1992, “A Substantiated Risk Assessment of a Jacket Structure,” Proc. Offshore Technology Conference, Houston, Paper No. OTC 7075.
Petrauskas, C., Botelho, D. J. R., Krieger, W. F., and Griffin, J. J., 1994, “A Reliability Model for Offshore Platforms and its Application to ST 151H and K Platforms During Hurricane Andrew (1992),” Proc. Behavior of Offshore Structure Systems, BOSS, MIT.
American Petroleum Institute (API), 1994, “API RP 2a-WSD, 20th Edition, Draft Section 17, Assessment of Existing Platforms.”
Thoft-Christensen, P., and Sorensen, J. D., 1982, “Reliability of Structural Systems With Correlated Elements,” Applied Mathemathical Modeling, Vol. 6.
Bea, R. G., 1995, “Development and Verification of a Simplified Method to Evaluate Storm Loadings on and Capacities of Steel, Template-Type Platforms,” Proc. Energy and Environmental Expo 95, ASME, New York.
Bea, R. G., and Mortazavi, M., 1995, “Simplified Evaluation of the Capacities of Template-Type Offshore Platforms,” Proc. 5th Intl. Offshore and Polar Engineering Conference, ISOPE, Golden.
Stear, J., Jin, Z., and Bea, R. G., 1998, “TOPCAT: Template Offshore Platform Capacity Assessment Tools—Computer Program,” User’s Manual, Marine Technology and Management Group, University of California, Berkeley.
Cox, J. W., 1987, “Tubular Member Strength Equations for LRFD,” Final report, API PRAC, Project 86-55.
Bea, R. G., 1997, “Risk Based Oceanographic Criteria for Design and Requalification of Platforms in the Bay of Campeche,” Report, Marine Technology and Management Group, UC Berkeley.
Oceanweather Inc., 1996, “Update of Meteorological and Oceanographic Hindcast Data and Normal and Extremes. Bay of Campeche,” report to PEMEX/IMP.
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