Reliability Updating of Offshore Structures Subjected to Marine Growth

Marine growth is a known problem for oceanic infrastructure and has been shown to negatively impact the reliability of bottom-fixed or floating offshore structures submitted to fatigue or extreme loading. Among other effects, it has been shown to change drag forces by increasing member diameters and...

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Main Authors: Franck Schoefs, Thanh-Binh Tran
Format: Article
Language:English
Published: MDPI AG 2022-01-01
Series:Energies
Subjects:
Online Access:https://www.mdpi.com/1996-1073/15/2/414
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author Franck Schoefs
Thanh-Binh Tran
author_facet Franck Schoefs
Thanh-Binh Tran
author_sort Franck Schoefs
collection DOAJ
description Marine growth is a known problem for oceanic infrastructure and has been shown to negatively impact the reliability of bottom-fixed or floating offshore structures submitted to fatigue or extreme loading. Among other effects, it has been shown to change drag forces by increasing member diameters and modifying the roughness. Bio-colonization being highly random, the objective of this paper is to show how one-site inspection data increases reliability by decreasing uncertainties. This can be introduced in a reliability-based inspection framework for optimizing inspection and maintenance (here, cleaning). The modeling and computation are illustrated through the reliability analysis of a monopile in the European Atlantic area subjected to marine growth and according to the plastic collapse limit state. Based on surveys of structures in the North Sea, long-term stochastic modeling (space and time) of the marine growth thickness is first suggested. A Dynamic Bayesian Network is then developed for reliability updating from the inspection data. Finally, several realistic (10–20 measurements) inspection strategies are compared in terms of reliability improvement and the accuracy of reliability assessment.
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spelling doaj.art-553c60b23238402884ab4b756acaa8ad2023-11-23T13:35:47ZengMDPI AGEnergies1996-10732022-01-0115241410.3390/en15020414Reliability Updating of Offshore Structures Subjected to Marine GrowthFranck Schoefs0Thanh-Binh Tran1GeM (Institut de Recherche en Génie Civil et Mécanique), Institute for Research in Civil and Mechanical Engineering/IUML (Institut Universitaire Mer et Littoral), Sea and Littoral Research Institute, CNRS UMR 6183/FR 3473, Nantes Université, Ecole Centrale de Nantes, F44322 Nantes, FranceGeM (Institut de Recherche en Génie Civil et Mécanique), Institute for Research in Civil and Mechanical Engineering/IUML (Institut Universitaire Mer et Littoral), Sea and Littoral Research Institute, CNRS UMR 6183/FR 3473, Nantes Université, Ecole Centrale de Nantes, F44322 Nantes, FranceMarine growth is a known problem for oceanic infrastructure and has been shown to negatively impact the reliability of bottom-fixed or floating offshore structures submitted to fatigue or extreme loading. Among other effects, it has been shown to change drag forces by increasing member diameters and modifying the roughness. Bio-colonization being highly random, the objective of this paper is to show how one-site inspection data increases reliability by decreasing uncertainties. This can be introduced in a reliability-based inspection framework for optimizing inspection and maintenance (here, cleaning). The modeling and computation are illustrated through the reliability analysis of a monopile in the European Atlantic area subjected to marine growth and according to the plastic collapse limit state. Based on surveys of structures in the North Sea, long-term stochastic modeling (space and time) of the marine growth thickness is first suggested. A Dynamic Bayesian Network is then developed for reliability updating from the inspection data. Finally, several realistic (10–20 measurements) inspection strategies are compared in terms of reliability improvement and the accuracy of reliability assessment.https://www.mdpi.com/1996-1073/15/2/414bio-colonizationDynamic Bayesian Networkreliability updatingunderwater inspectionoffshoremonopile
spellingShingle Franck Schoefs
Thanh-Binh Tran
Reliability Updating of Offshore Structures Subjected to Marine Growth
Energies
bio-colonization
Dynamic Bayesian Network
reliability updating
underwater inspection
offshore
monopile
title Reliability Updating of Offshore Structures Subjected to Marine Growth
title_full Reliability Updating of Offshore Structures Subjected to Marine Growth
title_fullStr Reliability Updating of Offshore Structures Subjected to Marine Growth
title_full_unstemmed Reliability Updating of Offshore Structures Subjected to Marine Growth
title_short Reliability Updating of Offshore Structures Subjected to Marine Growth
title_sort reliability updating of offshore structures subjected to marine growth
topic bio-colonization
Dynamic Bayesian Network
reliability updating
underwater inspection
offshore
monopile
url https://www.mdpi.com/1996-1073/15/2/414
work_keys_str_mv AT franckschoefs reliabilityupdatingofoffshorestructuressubjectedtomarinegrowth
AT thanhbinhtran reliabilityupdatingofoffshorestructuressubjectedtomarinegrowth