DYNAMIC BEHAVIOUR OF SEMI-DUCTILE JACKETS UNDER EXTREME WAVE AND WAVE-IN-DECK FORCES

During extreme storms, peak wave loads may exceed a platform's ultimate static base shear capacity. A ductile structure may be able to resist such static overloads by taking advantage of the inertial resistance and the limited duration of the peak load. Another related problem occurs when the wave crest exceeds the lowest deck level. A basic understanding of the dynamic and post- elastic behaviour of jacket-type offshore platforms in these loading environments is the principal objective of this study. Insight into these problems is facilitated by the use of single-degree-of-freedom models (SDOF) that represent the global (pushover) force- deformation properties of structural systems such as K- and X- braced frames. The wave-in-deck problem is considered by uncoupling the (SDOF) deck portal from the jacket. While the global jacket problem is quasi-static in the linear region, the deck problem is dynamically sensitive in this region; both systems effectively behave as sliding masses in the non-linear region.

  • 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 359 [18 p, 10 ref, 1 tab, 12 fig]
  • Authors:
    • Schmucker, D G
    • Cornell, C A
  • Publication Date: 1994

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717059
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM