Long-Term Reliability of a Jackup-Platform Foundation

  • Knut O. Ronold
Conference paper
Part of the Lecture Notes in Engineering book series (LNENG, volume 61)


A probabilistic model for analysis of the foundation stability of a jack-up platform foundation is presented. A jack-up platform with three independent legs supported by individual spudcan footings is considered as an example, and a two-dimensional representation of this platform is adopted. Conventional bearing capacity failure as well as horizontal sliding of one of the spudcan footings are considered. Uncertainties in wave and wind loading as well as in soil strength properties are included. The long-term reliability of the foundation is assessed by means of a nested application of a first-order reliability method.


Failure Probability Reliability Index Significant Wave Height Limit State Function Maximum Wave Height 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    Arnesen, K., Dahlberg, R., Kjeey, H., and Carlsen, C.A., “Soil-Structure Interaction Aspects for Jack-Up Platforms”, Proceedings, 5th International Conference on Behaviour of Offshore Structures, Trondheim, Norway, 1988.Google Scholar
  2. [2]
    Bitner-Gregersen, E.M. and Haver, S., “Joint Long Term Description of Environmental Parameters for Structural Response Calculation”, Proceedings, 2nd International Workshop on Wave Hindcasting and Forecasting, Vancouver, B.C., Canada, 1989.Google Scholar
  3. [3]
    Bjerager, P., ‘Probability Computation Methods in Structural and Mechanical Reliability“, in Computational Mechanics of Probabilistic and Reliability Analysis, ed. W.K. Liu and T. Belytschko, Elme Press International, Lausanne, Switzerland, 1989.Google Scholar
  4. [4]
    Bjerager, P., Loseth, R., Winterstein, S.R., and Cornell, C.A., “Reliability Method for Marine Structures under Multiple Environmental Load Processes”, Proceedings, 5th International Conference on Behaviour of Offshore Structures, Trondheim, Norway, 1988.Google Scholar
  5. [5]
    Det norske Veritas, ‘Rules for the Design, Construction and Inspection of Offshore Structures, Appendix F, Foundations“, Det norske Veritas, Hevik, Norway, 1977.Google Scholar
  6. [6]
    Gazetas, G., “Analysis of Machine Foundation Vibrations: State of the Art”, Soil Dynamics and Earthquake Engineering, Vol. 2, No. 1, 1983.Google Scholar
  7. [7]
    Holm, C.A., Bjerager, P., and Madsen, H.O., ‘Iong Term System Reliability of Offshore Jacket Structures“, Proceedings, 2nd IFIP Working Conference on Reliability and Optimization of Structural Systems, ed. by P. Thoft-Christensen, London, England, Springer-Verlag, 1988.Google Scholar
  8. [8]
    Longuet-Higgins, M.S., “On the Joint Distribution of Wave Periods and Amplitudes in a Random Wave Field”, Proceedings of the Royal Society of London, Vol. A389, pp. 241–258, 1983.CrossRefMATHGoogle Scholar
  9. [9]
    Madsen, H.O., Krenk, S., and Lind, N.C., Methods of Structural Safety, Prentice Hall Inc., Englewood Cliffs, New Jersey, 1986.Google Scholar
  10. [10]
    Ronold, K.O., “Random Field Modeling of Foundation Failure Modes”, Journal of Geotechnical Engineering, ASCE, Vol. 116, No. 4, pp. 554–570, 1990.Google Scholar
  11. [11]
    Wen, Y.K. and Chen, C.H., “On Fast Integration for Time Variant Structural Reliability”, Probabilistic Engineering Mechanics, Vol. 2, No. 3, pp. 156–162, 1987.CrossRefGoogle Scholar
  12. [12]
    Whitman, R.V., “Representation of Soil-Structure Interaction for Offshore Gravity Structures”, Massachusetts Institute of Technology, 1974.Google Scholar

Copyright information

© International Federation for Information Processing, Geneva, Switzerland 1991

Authors and Affiliations

  • Knut O. Ronold
    • 1
  1. 1.Det norske VeritasHøvikNorway

Personalised recommendations