Stainless steels have advantage of high corrosion resistance and elongation compared with structural carbon mild steels. This paper presents the compressive strength behavior of stiffened plate which has a variety of stiffness ratio of longitudinal stiffeners and structural materials as well as plates slenderness based on numerical analysis. Firstly, combination of structural materials for the stiffeners and plate panels consists of the following four patterns ;(a) simple material, (b) material hybrid, (c) strength hybrid, (d) dual hybrid. At first, the strength behavior of these compressive stiffened plate models up to ultimate state is compared to that of stiffened plates with single material. Moreover, proposed is a strength evaluation method for the hybrid compressive stiffened plates with the stainless steels and carbon mild steels.
