Ultimate strength of stiffened plate with pitting corrosion and inclined crack under uniaxial compression

A structure encounters some defects during its lifetime that their role in structure’s strength must be surveyed . These structural defects as structural corrosion, corrosion and crack are created and expanded by various factors . Predicting residual strength of plate with damages such as cracking and corrosion is important for service life estimation of aged structures . A series of nonlinear finite element method (FEM) is employed for ultimate strength analysis of steel stiffened plates with pitting corrosion and crack . Influential parameters are including crack length, crack angle , pitting corrosion density and number of pits . It is found that ultimate strength is reduced by increasing crack length and crack angle relative to the loaded edge . Reduction of ultimate strength in intermediate plate depends on number of pitting and DOP . Reduction of ultimate strength plate in the effect of these defects dose not obey superposition principle.