Reliability of Marine Structural Components

[摘要] The use of strength formulations' characteristic of marine structural components in reliability assessment is investigated throughout a series of systematic studies The marine structural components used were the stiffened plate and the ring and stringer stiffened cylinder and the design scenario is their resistance to compressive loads (buckling) which is the most common failure modes in marine structures. The systematic studies provided a good understanding of the behaviour of the several strength formulations when they are used in reliability calculations. Also, the importance of all uncertainties involved was analysed and commented. The formulations considered for the stiffened plates buckling strength were the proposals of Faulkner, Guedes Soares, Ivanov and Rousev, Carlsen, Ueda and Yao, Soreide and Czujko, Valsgard, ABS, Dier and Dowling and Stonor et al. The formulations are flilly described in the text along with the discussion of their reliability assessment results. The formulations considered for the ring-stringer stiffened cylinders buckling strength were the proposals of several codes of practice API Bui 2U, RCC, DnV CN-30.1 and ECCS-29. They are finally described in the text along with the discussion of their uncertainties and reliability assessment The strength modelling parameters are the most important variables in the reliability assessment and they were investigated for the case of the ring-stringer stiffened cylinders All formulations were compared with two large test results databases and the uncertainties were derived for all cases. Finally the last chapter aggregates the conclusions of the systematic studies for the stiffened plates and cylinders with the demonstration of the importance of good strength modelling for the reliability based design of structures. The methodology for good strength modelling is described and used in improving the strength formulations for the ring-stringer stiffened cylinders.

[发布机构] University:University of Glasgow

[关键词] Ocean engineering