Development of reliability based classification rules for tankers

An approach has been developed for formulating a code for design of ship structures to achieve uniform structural safety (reliability index) independent of ship size or magnitude of the design variables. The approach is based on the partial safety factor format and a prescribed reliability level determined from calibration with existing classification society rules. Examples are presented for determining criteria for section modulus and initial scantlings of tankers. Formulations are based on material yield strength, buckling, ultimate strength, and fatigue reliability.