A Consideration of Wave-Induced Loads for Direct Strength Calculation under Extreme Waves(Part1,<SPECIAL ISSUE>Strength Assessment of Double Hull Tankers)

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This paper discusses the relationship between extreme values in long-term distribution and the short-term values under each sea-state which ships may encounter through their lifetime, for wave-induced loads such as ship motions, hull girder moments and hydrodynamic pressures. Based on this discussion, a simplified formula for wave-induced loads equivalent to the extreme value in the long-term distribution at the exceedance probability of 10^<-8> is proposed, together with the corresponding sea-states, based on a series of direct load analyses of tankers and bulk carriers. Furthermore, nonlinear characteristics with respect to waveheight on wave-induced loads are discussed based on comprehensive experimental results using a blunt ship model in regular/irregular extreme waves. Finally, a correction method of the observed nonlinear phenomenon is proposed.
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