Research Article
Mar 1972
Offshore Structures—Statistical Strain Recording
Authors: Michael A. Garnett, Bhan Mabin, and Terence E. H. LemonAuthor Affiliations
Publication: Journal of the Structural Division
Volume 98, Issue 3
Abstract
A survey of structural problems on offshore rigs indicates a need for a better understanding of fatigue loading produced by dynamic effects initiated by the oceanic environment. For general design purposes a valid loading spectra might be produced by measuring elastic strain cycles in selected oceanic areas, over extended periods. Examination of a typical strain sensor output shows that the record can be handled as counts of cyclic loading at preselected magnitudes. These indicate the loading spectrum for that particular area, and also can be used, in association with Miner's cumulative damage hypothesis, to provide an estimate of the damage produced by the loading history. A simple instrument is described which will count the number of times particular strain levels have been exceeded. Numbers of counts can be printed out automatically for periods of up to 8 weeks, and can also be read manually at any time. Special provision is required if long term variation in mean strain is to be corrected.
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Information
Published In
Journal of the Structural Division
Volume 98 • Issue 3 • March 1972
Pages: 587 - 598
Copyright
© 1972 American Society of Civil Engineers.
History
Published in print: Mar 1972
Published online: Feb 1, 2021
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Authors
Affiliations
Michael A. Garnett
Mgr.-Marine Systems, British Aircraft Corp. Ltd., Guided Weapons Div., Bristol, England
Bhan Mabin
Head of Structures Design, British Aircraft Corp. Ltd., Guided Weapons Div., Bristol, England
Terence E. H. Lemon
Group Leader-Electronics Design, Britisli Aircraft Corp. Ltd., Guided Weapons Div., Bristol, England
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.