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Fatigue Analysis of Offshore Structures

In: Stochastic Analysis of Offshore Steel Structures

Author

Listed:
  • Halil Karadeniz

    (University of Technology)

  • Mehmet Polat Saka

    (Middle East Technical University)

  • Vedat Togan

    (Karadeniz Technical University)

Abstract

This chapter presents the fatigue phenomenon process in structural elements and connections. It includes six sections. The first section summarizes fatigue process, the source of fatigue, and the modeling of fatigue in general. The second section is devoted to the calculation of fatigue damages by using different methods. The fracture mechanics and S–N curve approaches are especially highlighted and their formulations are presented. Then, the cumulative fatigue damage is explained by using the Palmgren–Miner’s rule. In the third section, to estimate the fatigue damage, cycle counting procedures are presented for random stresses with the emphasis on the rainflow cycle counting. The fourth section is devoted to the parametric formulation of the probability distribution of random stress ranges. The parameters in this formulation are determined from numerical experiments by using the rainflow cycle counting algorithm. The fifth section presents and explains the total spectral fatigue damage for a given lifetime by using a multilinear S–N fatigue model. The sixth section demonstrates the fatigue damage calculation of an example offshore structure.

Suggested Citation

  • Halil Karadeniz & Mehmet Polat Saka & Vedat Togan, 2013. "Fatigue Analysis of Offshore Structures," Springer Series in Reliability Engineering, in: Stochastic Analysis of Offshore Steel Structures, edition 127, chapter 0, pages 287-314, Springer.
    • Handle: RePEc:spr:ssrchp:978-1-84996-190-5_5
    DOI: 10.1007/978-1-84996-190-5_5
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