ABSTRACT
This chapter presents new type of simple methodology that models initial geometric imperfection of damaged stiffeners by employing curvature values. Calculations are separated into two parts; first is the geometric calculations based on simple usage of curvature values of the structure, second is the moment curvature relationship. Accurate deflection curve of the plastically damaged deflection curve and residual stress distribution are essential and play an important role in residual strength calculation. There are several destructive or non-destructive measurement methods for the residual stresses of the structures. Curve modelling method from curvatures is expressed for numerical calculation. Curvature modelling from deflection curve locations is introduced using geometric relations. History of loading or residual strength of the plastically deformed structure can be performed with the proposed method. Post buckling analysis for residual stress free initial deflected structures can be obtained just by addition of initial curvature to actuated curvature due to loading.
