Developing target reliability for novel structures: The case of the mobile offshore base
Journal
Marine Structures
Journal Volume
14
Journal Issue
1-2
Pages
37-58
Date Issued
2001
Author(s)
Bhattacharya, B., Basu, R., Ma, K.-T.
Abstract
Reliability-based design criteria are usually calibrated to existing structures (of the same class) having a history of successful service. However, as the offshore industry continues to witness innovations, some novel structures clearly exceed the scope of existing design standards. A reliability-based design is attractive in such cases, but the calibration exercise is not feasible and target reliabilities need to be derived from more fundamental considerations. This paper describes a general risk-based methodology for identifying significant limit states and deriving corresponding target reliabilities for such novel structures. Reliabilities of various existing structures and available analytical methods for determining target reliabilities are reviewed. Careful consideration is given to failure consequences, both tangible and intangible, and reliabilities of intact as well as damaged structures are considered. The methodology is illustrated with the US Navy's Mobile Offshore Base concept, which is a unique offshore structure in terms of function and size, and for which no precedence or industry standard exists. © 2001 Elsevier Science Ltd. All rights reserved.
Type
journal article