IMPACTS AND COLLISIONS OFFSHORE. PROGRESS REPORT NO. 8. SHIP IMPACT FORCES IN COLLISION WITH PLATFORM LEGS

The load-deformation relationships of ships being indented by a rigid vertical cylindrical column have been calculated theoretically based on a collapse model accounting for large plastic deformations. Various types of tankers and service vessels representative of those operating on the oil fields in the North Sea have been analysed for impact against typical platform legs. The derived resistance to penetration is compared with a modified Minorski formula. The drift velocity of vessels in the "engine out" condition has been studied. A simplified criterium for impact velocity is proposed. The maximum load experienced in sideways collision has been estimated assuming all energy absorbed by the vessel. Principal uncertainties of the calculation model are pointed out and their influence on the estimates of maximum load have been studied.

  • Corporate Authors:

    Norske Veritas

    P.O. Box 300, Veritasveien 1
    N-1322 Hovik,   Norway 
  • Authors:
    • Kjeoy, H
    • Amdahl, J
  • Publication Date: 1979-10

Media Info

  • Pagination: n.p.

Subject/Index Terms

Filing Info

  • Accession Number: 00319515
  • Record Type: Publication
  • Report/Paper Numbers: DnV Report 79-0691
  • Files: TRIS
  • Created Date: Oct 8 1980 12:00AM