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Non-Linear Fatigue Analysis for Jacket Offshore Structures

[+] Author Affiliations
O. Gaidai, A. Naess

Norwegian University of Science and Technology, Trondheim, Norway

Paper No. OMAE2006-92142, pp. 113-119; 7 pages
doi:10.1115/OMAE2006-92142
From:
  • 25th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 3: Safety and Reliability; Materials Technology; Douglas Faulkner Symposium on Reliability and Ultimate Strength of Marine Structures
  • Hamburg, Germany, June 4–9, 2006
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-4748-9 | eISBN: 0-7918-3777-7
  • Copyright © 2006 by ASME

abstract

This paper presents different approaches for accounting for nonlinear effects in fatigue analysis. One approach is an application of the quadratic approximation method described in [3, 4] to the stochastic fatigue estimation of jacket type offshore structures. An alternative method proposed is based on a spectral approximation, and this approximation turns out to be quite accurate and computationally simple. The stress cycles causing structural fatigue are considered to be directly related to the horizontal excursions of the fixed offshore structure in random seas. Besides inertia forces, it is important to study the effect of the nonlinear Morison type drag forces. Since no direct method for dynamic analysis with Morison type forces is available, it is a goal to find an accurate approximation, allowing efficient dynamic analysis. This has implications for long term fatigue analysis, which is an important issue for design of offshore structures.

Copyright © 2006 by ASME

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