PROBABILISTIC FATIGUE ANALYSIS OF FIXED OFFSHORE STRUCTURES

This paper describes the application of probabilistic techniques to the detailed determination of local stress histories, thus permitting a detailed member-by-member fatigue analysis of fixed offshore structures. Using a suitable static or dynamic structural analysis program, the transfer functions for hot spot stresses at four points around each member end in the structure are generated as a function of wave frequency and direction. For each given sea state and wave direction, short-term stress statistics at the hot spots are calculated from the associated wave spectrum and transfer function. The resulting short-term stress statistics in all the yearly sea states in the wave scatter diagram, and for given probabilities of occurrence of the various wave directions, are then combined to yield long-term stress statistics at each hot spot. Finally, Miner's cumulative damage law is applied to evaluate local fatigue damage.

Media Info

  • Features: References;
  • Pagination: p. 889-906

Subject/Index Terms

Filing Info

  • Accession Number: 00138234
  • Record Type: Publication
  • Source Agency: Offshore Technology Conference
  • Report/Paper Numbers: V2, OTC 2608 Proceeding
  • Files: TRIS
  • Created Date: Aug 23 1976 12:00AM