Reliability Updating of Offshore Structures Subjected to Marine Growth

Franck Schoefs and Thanh-Binh Tran
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Franck Schoefs: GeM (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, France
Thanh-Binh Tran: GeM (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, France

Energies, 2022, vol. 15, issue 2, 1-15

Abstract: 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.

Keywords: bio-colonization; Dynamic Bayesian Network; reliability updating; underwater inspection; offshore; monopile (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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