This paper presents a simple estimation method of the remaining compressive strength for corroded flange plates. Non-linear finite element analyses of compression flange plates with corroded surface generated by the spatial autocorrelation model were performed parametrically using isoparametric shell elements.
From the numerical results, it is concluded that the compressive strength of corroded flange plates can be estimated from the buckling strength curve of corrosion-free plate by using two parameters, t_R=t_avg+2σ_t and e_avg/t_avg, where t_R=representative thickness for rating width-thickness ratio, t_avg=average thickness, σ_t=standard deviation of plate thicknesses and e_avg=average eccentricity.