Longitudinal Strength of Ships in Rough Seas

In this paper, the longitudinal strength of ships in rough seas are investigated taking account of slamming. Illustrative calculations are performed for two ships; a fast container ship with large bow-flare and a full-bodied large bulk carrier in fully laden condition. In the former case, the longitudinal vertical bending moment in the main hull girder is investigated in case of bow-flare slamming, and the interactions of bottom and bow-flare slamming are clarified. Besides the calculations, a series of tank tests is conducted in a basin to confirm the theory, making use of an elastic model ship. In the latter case, special interests are concentrated to the occurrence of serious bottom slamming for full-bodied ships in the fully laden conditions.