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Deterministic and Probabilistic Assessment of FPSO Hull Girder Strength

Lookup NU author(s): Professor Atilla Incecik, Dr Yongchang Pu


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This paper describes how FPSOs are good candidates for marginal and deep water oil fields. Because of their unique operational scenarios, such as operating in allocation for quite a long time, constant change of its loading conditions, possible harsh environments, etc., the design criteria for conventional ships are not necessarily applicable to FPSOs. The objective of this paper is to develop a new assessment procedure based on the prediction of global hull girder loads and stresses from first principle. The paper predicts that stillwater and wave-induced loads on a typical FPSO by both first principle and rule-based calculations. The long-term prediction of hull-girder loads was also carried out for two sites. The hull girder was then assessed by both deterministic and probabilistic approaches. In deterministic analysis the primary and local strength of the FPSO is assessed by rule-based formulations. The progressive collapse analysis was used to predict the ultimate strength of the hull girder. In probabilistic analysis, reliability of three failure modes of the hull girder was estimated by the first order second moment method. It was found that the rule-based wave-induced load prediction method yields much smaller values than the first principle calculation. It is believed that wave-induced loads should be obtained using a first principle approach.

Publication metadata

Author(s): Incecik A, Pu Y

Editor(s): You-Sheng Wu, Wei-Cheng Cui, and Guo-Jun Zhou

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Eighth International Symposium on Practical Design of Ships and Other Floating Structures

Year of Conference: 2001

Pages: 947-953

ISSN: 0080439500

Publisher: Elsevier