Authors developed a whole ship finite element analysis system from a nonlinear wave loads to a structural strength at real sea state. A methodology for the rational analysis of structural strength is examined. Firstly, wave pressure, which is the input for the present whole ship finite element analysis and has much effect on the accuracy of a whole ship analysis, is validated through the comparison with experiments. It is confirmed that the present computation can estimates wave pressure in various wave condition accurately. Secondly, the whole ship finite element analysis system by the combination with the computation of nonlinear wave pressure is verified. It is verified that the present method can evaluate a structural response in irregular waves with taking account of the nonlinear effect of ship motions and slamming induced impact loads explicitly. Finally, through the structural analysis in various ship forward speed and wave condition by means of the present computation, the importance to assess a structural strength taking account of the effect of operational condition is clarified.

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