CALIBRATION OF A DYNAMIC ANALYSIS PROCEDURE USING MEASUREMENTS FROM A NORTH SEA JACK-UP IN A SEVERE STORM

Field measurements taken from the Maersk Guardian jackup operating in 75m of water in the North Sea are used to calibrate dynamic analysis procedures. These procedures include wave load modelling, damping, and, most importantly, foundation fixity. The measurements demonstrate the existence of foundation fixity during a large storm event. However, the measurements also indicate some nonlinearity occurring during the storm. This paper describes the measurement program, along with a summary of the data recovered. It continues with a comparison of these measurements to time-domain analytical results. These time-domain analyses are based primarily on procedures specified in the Recommended Practice for Site Specific Assessment of Mobile Jackup Units developed as a joint-industry project. Time-domain analysis was used to study various nonlinear foundation models. The load- shedding model was found to directionally produce the best fit to the measurements. It is concluded that neglecting foundation fixity may be conservative in a dynamic analysis of a jackup.

  • Supplemental Notes:
    • OTC 95, 27th Annual Offshore Technology Conf; 1-4 May 1995; Houston, Tx, USA. Procs. Vol 3, ppr 7840, p 333 [9 p, 12 ref, 1 tab, 13 fig]
  • Authors:
    • Weaver, T O
    • Brinkmann, C R
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00727720
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Nov 4 1996 12:00AM