Offshore Platform Fatigue Cracking Probability
Publication: Journal of Structural Engineering
Volume 111, Issue 8
Abstract
A systems approach is presented for fatigue reliability analysis of offshore platforms. The probability of fatigue crack occurrence in individual structural joints is considered. A nomograph relating deterministic fatigue life to probability of fatigue cracking is developed based on the lognormal fatigue reliability format. Joints are grouped according to ranges of fatigue life. Fatigue cracking probabilities of joints in each group are determined as a function of service life. Bernoulli trials are used to evaluate the probabilities of 0, 1, 2, 3,… cracks occurring in each group and also in the entire structure. The effects of fatigue life correlation are included. It is shown that the number of joints, years of service life, and correlation effects are important factors in assessing system fatigue reliability. Analysis of a North Sea platform indicates a high level of reliability against fatigue damage.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 111 • Issue 8 • August 1985
Pages: 1647 - 1660
Copyright
Copyright © 1985 ASCE.
History
Published online: Aug 1, 1985
Published in print: Aug 1985
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