The longitudinal strength determination of any vessel over 30m is an important consideration but even more critical for composite vessels made with relatively low modulus materials. The effect of features such as a topside door, deck hatches, a discontinuous deck, and the superstructure on the hull girder strength and stiffness of a composite 140 foot (38 meter) patrol boat was investigated through finite element analysis. The results were compared to different classification societies’ section modulus and moment of inertia requirements.

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