Fatigue Analysis of a Mono-Tower Platform

Poul Henning Kirkegaard, John Dalsgaard Sørensen, Rune Brincker

Research output: Book/ReportReportResearch

631 Downloads (Pure)

Abstract

In this paper, a fatigue reliability analysis of a Mono-tower platform is presented. The failure mode, fatigue failure in the butt welds, is investigated with two different models. The one with the fatigue strength expressed through SN relations, the other with the fatigue strength expressed through linear-elastic fracture mechanics (LEFM). In determining the cumulative fatigue damage, Palmgren-Miner's rule is applied. Element reliability as well as systems reliability is estimated using first-order reliability methods (FORM). The sensitivity of the systems reliability to various parameters is investigated. The systems reliability index, estimated by using the fatigue elements with the fatigue strength expressed through SN relations, is found to be smaller than the systems reliability index estimated by using LEFM. It is shown that the systems reliability index is very sensitive to variations of the natural period, damping ratio, current, stress Spectrum and parameters describing the fatigue strength. Further, soil damping is shown to be significant for the Mono-tower.
Original languageEnglish
Place of PublicationAalborg
PublisherDept. of Building Technology and Structural Engineering, Aalborg University
Number of pages23
Publication statusPublished - 1988
SeriesFracture and Dynamics
Number9
VolumeR8840
ISSN0902-7513

Bibliographical note

PDF for print: 23 pp.

Keywords

  • Reliability Analysis
  • First-Order Reliability Methods
  • FORM
  • Sensitivity Analysis
  • Fatigue Failure
  • Random Loads
  • Offshore
  • Mono-Tower Platform

Fingerprint

Dive into the research topics of 'Fatigue Analysis of a Mono-Tower Platform'. Together they form a unique fingerprint.

Cite this