2025S-GS5-1 防撓材の曲げ強度に対するウェブせん断応力の影響の簡易算式について

抄録

Stiffeners are essential members of ship hull structures composed of stiffened panels，and their scantlingformulaeagainstlateralpressureareimportantfordesigningsafeandrationalhullstructures. Intypicalscantlingformulaeofclassificationsocieties，thereductioninthefullyplasticmomentdueto theshearstressisnotdirectlyconsideredinthecurrentdesign.Inthisstudy，wefirstderivedasimple formulation ofthe shear stress effect with the simultaneous action of an axial stress under agiven stiffenerconfiguration，and showedthat the reduction ofthe fullyplastic moment canbe calculated usingthreenon-dimensionalparameters.Basedontheformulation，wediscussedhoweachparameter contributes to the fully plasticmoment as well as theconditionunder which the shear stress can beeffectively neglected. Subsequently，we used the finite element analysis (FEA) based on the residualdeflectioncriterion，therebyverifyingthevalidityofthetheoreticalproposals.Finally，weproposedascantling formula，rationally taking account of the shear stresseffect.