Page 144 - Introduction to Naval Architecture

130 STRENGTH

Figure 7.4 Shearing force and bending moment

Figure 7.5 Still water and wave bending moments

same amount. Whether the greater bending moment occurs in sagging
or hogging depends on the type of ship depending, inter alia, upon the
block coefficient. At low block coefficients the sagging bending
moment is likely to be greater, the difference reducing as block
coefficient increases.

Example 7.1

Consider a vessel of constant rectangular cross section, 140m
long, 20m beam and 13m deep, with total mass 25 830 tonnes,
20 830 of which is uniformly spread over the length and the rest
distributed uniformly over the central 10m. Calculate the
bending moments and shearing forces.