The appearance of cracks in hull structures is a common damage scenario usually encountered in the operational life of a vessel. For the transition from proactive to predictive maintenance the ability of monitoring and estimating the fatigue accumulation is of great value. Currently this procedure is based in SN curves yet there is interest in utilizing fracture mechanics approaches. In the attempt to predict the propagation of that flaw, the computation of Stress Intensity Factor on the crack tip is of great value as SIF is one of the most important parameters that governs the crack propagation. A two compartment Finite Element (FE) model of a containership is employed in this specific study alongside with two FE submodels for the better representation of the cracked structural detail of interest. The task at hand is the calculation of the SIF when the vessel is subjected to hull-girder and local loadings. The implementation of this methodology is crucial for the fatigue monitoring of ship hull structures.