5003 Lectures - Faculty of Engineering and Applied Science

E5003 - Ship Structures I 43
© C.G. Daley
Topic 5: Longitudinal Strength: Murray’s Method
Battleship TEXAS
Introduction
In this chapter we will
Discuss Murray’s Method to estimate still water bending moments
~~~~~~~~~~~~~~~~~~~~
Murray’s Method
Murray’s method is based on the idea that forces and moments in a ship are selfbalancing
(no net force or moment is transferred to the world). Any set of weight
and buoyancy forces are in balance.
Also, for any cut at x, the moment at the cut can be determined in two ways;
BM ( x)
= y L − y L
= y
5
1
L
5
1
− y
3
2
L
3
2
− y
Murray applied this idea to a ship:
4
L
4