## Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 9, Part 2American Society of Mechanical Engineers, 1990 - Arctic regions |

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Page 241

UNCERTAINTY IN FATIGUE

UNCERTAINTY IN FATIGUE

**DAMAGE**ESTIMATION FOR A JACKET PLATFORM D. Karunakaran , B. J. Leira , and A. Olufsen SINTEF Structural Engineering Trondheim , Norway H. Nordal STATOIL Stavanger , Norway 623 2446 5712 9576 12799 14513 14454 ...Page 248

... the SN - curve = 3.0 logā = log a - 2 log s = 12.16 cut - off level at N = 2 10 % cycles Figure 2 SN - curve for tubular joints . DEn curve T 12 3.2 COV IN

... the SN - curve = 3.0 logā = log a - 2 log s = 12.16 cut - off level at N = 2 10 % cycles Figure 2 SN - curve for tubular joints . DEn curve T 12 3.2 COV IN

**DAMAGE**10 3.0 2.8 8 2.6 6 2.4 2.2 X 2.0 N 0 N 6 8 x 10 - year FATIGUE**DAMAGE**...Page 252

3 more realistic population size ( M - 100 ) and more realistic

3 more realistic population size ( M - 100 ) and more realistic

**damage**estimates generated by random sampling . The trends of Figs . 1 and 2 are firmed here , but the curve shapes and probabilities associated with a given sample are ...### What people are saying - Write a review

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### Contents

Investigation of the Ergodicity Assumption for Sea States in the Reliability Assessment of Offshore | 1 |

OFFSHORE TECHNOLOGY PART | 33 |

Extreme Forces on Large AxiSymmetric Offshore Structures in Directional Seas | 49 |

Copyright | |

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analysis applied approach approximately assessment assumed average basic calculated coefficient component computed considered constant corresponding cost crack growth curve cycles damage defect density depends depth derived described determined developed deviation distribution drag effects Engineering equation equivalent estimated evaluated example expected extreme factor failure failure probability fatigue Figure force fracture frequency function geometry given important included increase indicated initial inspection integration joints limit linear load Lognormal material maximum mean measured mechanics method normal obtained offshore structures operation parameters performed period platform predicted present pressure probabilistic probability procedure random variable range ratio reference relative reliability represent requirements respectively response risk safety sensitivity shown shows significant simulation standard statistical storm strength stress structure surface Table tension tether tubular uncertainty variables variation wave wave height weld