ULTIMATE CAPACITY OF JACK-UPS CONSIDERING FOUNDATION BEHAVIOUR

Various models for spudcan behaviour and their implementation in the nonlinear computer program USFOS are discussed. The models are valid for a spudcan on a seabed of sand and are based upon the classical effective stress bearing capacity diagrams expressed in the form of a simplified yield criterion and a hardening law in terms of penetration depth. Static pushover analysis is carried out for an actual jackup rig assuming both pinned conditions and more realistic foundation behaviour. Of particular interest is force redistribution within the spudcan after failure and the effect on ultimate capacity. For pinned footing conditions time domain simulation of the response to the extreme environmental loads is performed considering inertia effects. The results are compared with those from static pushover analysis.

  • Supplemental Notes:
    • BOSS '94, 7th Intl Conf on the Behaviour of Offshore Structures; 12-15 July 1994; Massachusetts, USA. Procs. Publ by Pergamon, ISBN 0 08 041915 1. Vol 3, p 347 [12 p, 8 ref, 8 fig]
  • Authors:
    • Amdahl, J
    • Johansen, A
    • Svan, G
  • Publication Date: 1994

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717058
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM