The objective of the present study is to assess the ultimate hull girder strength taking the section modulus into account under longitudinal bending. A Ro-Ro Ship is taken as object ship. A Ro-Ro Ship has a unique character because most of the longitudinal elements locate above neutral axis. While there are not the longitudinal elements under the neutral axis particularly at the bottom part so that the bottom part consists plate only. The simple expression implemented into in-house program to calculate the section modulus of ship cross section is performed. The cross section is assumed to be remained plane and the simply supported of boundary condition is imposed on plate and stiffened plate elements in the cross section. The vertical bending moments are imposed to both sides of the cross section. The ultimate hull girder strength is calculated by considering the section modulus including their progressive collapse behavior for Ro-Ro ship hull.
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