I was given an assignment from my teacher name Sir
Rahat Aziz on 20 april 2013. The title of the assigment is Transverse bending.
Transverse bending
The transverse
structure of a ship is subject to three different types of loading:
·
Forces due to weights of the ship
structure, machinery, fuel, water and cargo.
·
Water pressure plus forces due to wind
and waves plus machinery motion.
·
Forces created by longitudinal
bending.
The deck must be
designed to support the weight of accomodation, winches and cargo. While
exposed decks may have to withstand a tremendous weight of water shipped in
heavy weter. The deck plating is connected to beams which transmit the load to
longitudinal girders and to the side frame.
In machinery
spaceother factors must be taken into account. Forces of pulsating nature are
transmitted through the structuredue to the general out balance forces of
machinery parts. The machinery seats must be extremely well supported to
prevent movement of the machinery.
A considerable force
is exerted on the bottom and side shell by the water surrounding the ship. The
double bottom floors and sides frames are designed to withstand these forces,
while the shell plating must be thick enough to prevent bucking between the
floor and frames. Since water pressure increased with the depth of immersion,
the bottom shell must be thicker than the side shell.
When the ship passes
through waves, these forces of pulsating nature and may vary considerably in
high waves, while in bad weather conditions the shell plating above the
waterline will receive severe hammering
