波浪中の船体に誘起される非線形応力極大値の確率分布

概要

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The useful method is proposed for calculation of the statistical distribution of the maxima of non-linear stress such as the von Mises' equivalent stress induced on the longitudinal member of a ship hull in sea waves. This method is based upon an assumption that the wave normal stress and the wave shearing stress which produce the equivalent stress would be regarded as completely dependent variables and upon another assumption that those stresses would be regarded as completely independent variables. The application of this method is made for a gigantic oil tanker in a short-term seaway and the calculated results of the statistical distribution of the maxima of equivalent stress induced on the longitudinal member have been examined in comparison with the histograms obtained from the numerically simulated time histories of equivalent stress. Satisfactory agreement is found between both results and the validity of the proposed method is recognized.
社団法人日本船舶海洋工学会の論文