Foundation reliability of a jack-up platform
- SINTEF Structures and Concrete, Trondheim (Norway)
- SINTEF Geotechnical Engineering, Trondheim (Norway)
- NTH, Trondheim (Norway). Inst. of Marine Structures
A method for reliability analysis of fixed marine structures is outlined. Nonlinearities in hydrodynamic loading and soil behavior are accounted for by application of a time domain Simulation approach. The procedure accounts for the relative importance of low sea states causing high dynamic amplification and extreme sea states with a quasistatic type of response. This is achieved by the long term approach where the response characteristics for a number of sea states are weighted by the relative frequency of occurrence for each sea state. Statistical uncertainty in time-invariant parameters is included, and Importance Sampling Techniques are employed to produce sample vectors of these parameters. For each input vector, a long term response analysis is performed. As an example of application, the foundation reliability of a jack-up platform is analyzed. The effect of using different center points for the importance sampling is investigated. An optimal sampling is determined, and a convergence study is performed using increasing sampling sizes. The accuracy in a response surface approach as an alternative to full time domain analyses is also studied. The procedure is found to be highly applicable. Finally, a simplified foundation design method is calibrated by comparing with failure probabilities from a consistent reliability analysis.
- OSTI ID:
- 55781
- Report Number(s):
- CONF-940230-; ISBN 0-7918-1265-0; TRN: IM9525%%462
- Resource Relation:
- Conference: 13. international conference on offshore mechanics and Arctic engineering (OMAE-13), Houston, TX (United States), 27 Feb - 3 Mar 1994; Other Information: PBD: 1994; Related Information: Is Part Of OMAE 1994. Volume 2: Safety and reliability; Guedes Soares, C.; Bea, R.; Dover, W.; Gierlinski, J.; Atkins, W.S. [eds.]; PB: 400 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dynamic analysis of jack-up rigs using advanced foundation models
Calibration of a dynamic analysis procedure using measurements from a North Sea jack-up in a severe storm