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TECHNICAL PAPERS

Assessment of Offshore Platforms Under Subsidence—Part II: Analysis and Results

[+] Author and Article Information
Alok K. Jha

Risk Management Solutions, Menlo Park, CA 94025

Omer K. Kiciman

Bechtel, San Francisco, CA 91341

Joseph M. Gebara

Aker Engineering, Inc., Houston, TX 77079

Bernhard Stahl

Houston, TX 77052

Knut H. Dahl-Stamnes

BP Amoco Norge AS, Stavanger, Norway

J. Offshore Mech. Arct. Eng 122(4), 267-273 (Apr 21, 2000) (7 pages) doi:10.1115/1.1313531 History: Received October 01, 1998; Revised April 21, 2000
Copyright © 2000 by ASME
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References

Krieger, W. F., Banon, H., Lloyd, J. R., De, R. S., Digre, K. A., Nair, D., Irick, J. T., and Guynes, S. J., 1994, “Process for Assessment of Existing Platforms To Determine Their Fitness for Purpose,” OTC Paper No. 7482, Proc., Offshore Technology Conference, pp. 131–140.
Bea, R. G., Ramos, R., Valle, O., and Valdes, V., “Risk-Based Hurricane and Earthquake Criteria for Design and Requalification of Platforms in the Bay of Campeche, Mexico,” Proc. 17th International Conference on Offshore Mechanics and Arctic Engineering, Lisbon, Portugal.
Stahl, B., Aune, S., Gebara, J., and Cornell, C. A., 1998, “Acceptance Criteria for Offshore Platforms,” OMAE98, Lisbon, Portugal.
Gebara,  J., Dolan,  D., Pawsey,  S., Jeanjean,  P., and Dahl-Stamnes,  K., 2000, “Assessment of Offshore Platforms Under Subsidence—Part I: Approach,” ASME J. Offshore Mech. Arct. Eng., 122, pp. 260–266.
Pawsey, S., Driver, D., Gebara, J., Bole, J., and Westlake H, 1998, “Characterization of Environmental Loads on Subsiding Offshore Platforms,” OMAE 98, Lisbon, Portugal.
Aggarwal, R. K., Dolan, D. K., and Cornell, C. A., 1996, “Development of Bias in Analytical Predictions Based on Behavior of Platforms During Hurricanes,” OTC8077, Proc., Offshore Technology Conference, Vol. 2.
PMB Engineering, Inc., 1996, “Hurricane Andrew Effects on Offshore Platforms,” Phase II Joint Industry Project, Final Report, San Francisco, CA.
Madsen, H. O., Krenk, S., and Lind, N. C., 1986, Methods of Structural Safety, Prentice-Hall, Englewood Cliffs, NJ.
Risk Engineering, Inc., 1994, “RELACS-Reliability Analysis of Components and Systems,” Ver.2.0, Boulder, CO.
Jardine, R. J., and Chow, F. C., 1996, “New Design Method for Offshore Piles,” Marine Technology Directorate 96/103, U.K.
American Petroleum Institute, 1996, “Recommended Practice for Planning, Designing, and Constructing Fixed Offshore Platforms,” API RP2A-WSD, 20th Ed. Suppl. 1.
PMB Engineering, Inc., 1995, “CAP—Capacity Analysis Program,” San Francisco, CA.

Figures

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Pushover analysis directions
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Base shear versus deck displacement for Platform A with 10.5 and 34.1-ft subsidence values
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Platform A deformed shape and member nonlinear events for subsidences of 10.5 ft (on left) and 34.1 ft (on right)
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Base shear for Platform C (34.1 ft subsidence)
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Platform A base shear (broadside, 10.5 ft subsidence)
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Platform A deformed shape and member nonlinear events (broadside, 10.5 ft subsidence)
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Platform capacity and wave load as a function of wave height for 10.5 ft subsidence
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Ultimate strength of platforms as a function of subsidence
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Reserve strength ratio versus subsidence
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Annual failure probabilities for Platform A
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Platform annual probability of failure and acceptance limits

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