A sampling-based approach to identifying optimal inspection and repair strategies for offshore jacket structures

R. Schneider, A. Rogge, S. Thöns, E. Bismut, D. Straub

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Identifying optimal inspection and repair strategies for offshore jacket structures is a challenging task. We present an approach, which is based on recent developments in the field of risk-based operation and maintenance planning at the structural system level. The approach utilizes heuristics to define inspection and repair strategies at the system level and to reduce the search space of possible strategies. For each defined strategy, the expected service life cost of inspection, repair and failure is evaluated based on simulated inspection and repair histories. Subset simulation is applied to compute the conditional repair and failure probabilities required for this analysis. It also forms the basis for simulating inspection and repair histories. The strategy that minimizes the expected service life cost is the optimal one in the set of pre-selected strategies. The underlying condition and performance model accounts for the stochastic dependence among the deterioration states of the different structural elements and the structural redundancy. The approach is demonstrated in a case study considering a jacket-type frame. In this study, we essentially vary the inspection interval, the minimum number of inspected components and the target reliability, and identify the combination that minimizes the expected total service life cost.

Original languageEnglish
Title of host publicationLife-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision : Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018
EditorsDan M. Frangopol, Robby Caspeele, Luc Taerwe
Number of pages8
PublisherCRC Press
Publication date2018
Pages1081-1088
ISBN (Print)9781138626331
ISBN (Electronic)9781315228914
DOIs
Publication statusPublished - 2018
EventSixth International Symposium on Life-Cycle Civil Engineering - Ghent, Belgium
Duration: 28 Oct 201831 Oct 2018
Conference number: 6

Conference

ConferenceSixth International Symposium on Life-Cycle Civil Engineering
Number6
CountryBelgium
CityGhent
Period28/10/201831/10/2018

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