5003 Lectures - Faculty of Engineering and Applied Science

E5003 - Ship Structures I 57
© C.G. Daley
Topic 7: Longitudinal Strength: Inclined Bending / Section
Modulus
Introduction
In this Chapter we will
• Discuss the calculation of bending of an inclined vessel
• General calculation of hull section modulus/inertia
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Inclined and Lateral Bending
a breaking wave in Lisbon
When a ship rolls the weight and buoyancy forces cause lateral as well as vertical
bending. Normally the bending moment vector is aligned with the ship’s y axis. My
is the bending moment that results from buoyancy and weight forces.
When the vessels rolls by an angle q, the moment vector remains horizontal. This is
because the buoyancy and gravity forces are always vertical. This means that the
bending moment is no longer aligned with the y,z axis of the vessel;