Fatigue reliability assessment of coupled spar-mooring system

Jameel, M. and Ahmad, S. and Asme, M (2011) Fatigue reliability assessment of coupled spar-mooring system. Omae2011: Proceedings of the Asme 30th International Conference on Ocean, Offshore and Arctic Engineering, Vol 2: Structures, Safety and Reliability . Amer Soc Mechanical Engineers, New York, pp. 497-505.

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Abstract

Spar platform is a compliant floating structure used for exploration of oil and gas from deep sea. To ensure safe operations, reliability against mooring line failure is a major concern in design. Furthermore, the mooring lines have high investment costs and are normally not accessible for in-service inspection. The common approach for solving the dynamics of Spar system is to employ a decoupled quasi-static approach which ignores the platform and mooring lines interaction. Coupled analysis, used presently, considers the mooring lines and platform in an integrated single model. Hence, it effectively captures the damping effect due to Spar and mooring lines coupling. Finite element code ABAQUS is used to obtain the response of Spar-mooring system under long crested random sea with current. Limit state function is derived based on failure due to fatigue for probabilistic reliability assessment. Random variables, participating actively in the limit state function are identified and statistically modeled. The most probable points or the design points are found to be an effective parameter for estimating partial factors of safety for load and resistance variables. First Order Reliability Method (FORM) is used to calculate probability of failure and reliability indices. The results are later checked against Monte carlo simulation. Reliabilities of segmental length of mooring and of full length are determined as they may significantly differ if the mooring properties change along the length. Reliability indices of annual and life time sea states are calculated.

Item Type: Book
Additional Information: ISI Document Delivery No.: BDS23 Times Cited: 0 Cited Reference Count: 20 Jameel, Mohammed Ahmad, Suhail Proceedings Paper 30th International Conference on Ocean, Offshore and Arctic Engineering Jun 19-24, 2011 Rotterdam, NETHERLANDS ASME, Ocean Offshore & Arctic Engn Div Three park avenue, new york, ny 10016-5990 usa
Uncontrolled Keywords: exploration of oil and gas mooring lines Order Reliability Method (FORM)
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr. Mohammed Salim Abd Rahman
Date Deposited: 15 Jul 2013 01:46
Last Modified: 15 Jul 2013 01:46
URI: http://eprints.um.edu.my/id/eprint/7303

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