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Explain how racking occurs in a ship.Sketch and describe the arrangement used to resist racking in ships with sloping margin plate on the DB tank and with horizontal margin plate on DB tank and in Ro-Ro ferries.
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WHAT IS RACKING
When a ship is rolling, the deck tends to move laterally relative to the bottom structure, and the shell on one side to move vertically relative to
the other side. This type of deformation is referred to as ‘racking’.
HOW RACKING IS PREVENTED
One thing to be remembered, is that it is the transverse strength of the Ship's Hull which prevents the transverse deformation of the Hull (Racking)
( 1 )Transverse bulkheads (watertight bulkheads, including) primarily resist such transverse deformation, the side frames contribution being insignificant provided the transverse bulkheads are at their usual regular spacings.
( 2 ) Side frames of both the sides (port & starboard), when joined through the double bottom and deck transverse add to the Racking strength, through the margin plates.
( 3 ) Since in Ro-Ro Ships there is no Hopper and shoulder tank (Top side tank), which in bulk carrier are joined by the transverse frames and double bottom, to add the strength, this is achieved by several multi-decks and the transverse framing (as shown in the video of the Lecture on Structural Requirement of a Ship & on Ro-Ro Construction from IIT Kharagpur)
Understand the structural requirement of a Ship (also explaining what is Racking)
Construction of Ro-Ro Ship (To know how the transverse strength is added to prevent Racking