Abstract
Because of the uncertainties associated with loading, response and strength of mobile structures, their design is an inexact process. The effect of these uncertainties can be assessed through the use of an advanced Level II reliability analysis provided any error in the design model is explicitly considered. Such an analysis is described and its application to stiffened cylinders, often major components of floating platform, e.g. TLPs, is considered together with the calibration procedure necessary to quantify the design model error. Derivation of some extreme loads is discussed as well as the distribution types suited to the different variables in the analysis. Six different stiffened cylinder geometries are examined using the analysis and the variation of safety index with load is considered in detail. A further study is made comparing the reliabilities of two configurations for the same cylindrical column, one of which is a weight-optimum arrangement. Major differences in reliability are found.
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