SHELL CONSTRUCTIONSHELL CONSTRUCTION

GROUP CGROUP C

DMS(DO)DMS(DO)

OBJECTIVEOBJECTIVE

Variations in the thickness of shell platingVariations in the thickness of shell plating

SHELL PLATINGSHELL PLATING

ExternalExternal skin of ship. skin of ship.Consists of bottom Consists of bottom

shell plating and the shell plating and the side shell plating.side shell plating.Acts as a Acts as a watertight watertight

skinskinContributes Contributes

significantly to significantly to longitudinal strengthlongitudinal strength..

Bottom plating refers to the plating from Bottom plating refers to the plating from the keel to the turn of the bilge.the keel to the turn of the bilge.

This has the This has the greatest thicknessgreatest thickness because because bending stresses is greatest as the plates bending stresses is greatest as the plates are located are located farthest from the neutral axisfarthest from the neutral axis of the ship.of the ship.

BOTTOM SHELL PLATINGBOTTOM SHELL PLATING

Wide strip of Wide strip of longitudinal platinglongitudinal plating parallel to parallel to the keel plating.the keel plating.

Of Of uniform thicknessuniform thickness at the parallel middle at the parallel middle body region but tapering towards the ends body region but tapering towards the ends of the vessel.of the vessel.

STRAKESTRAKE

SIDE SHELL PLATINGSIDE SHELL PLATING

Refers to the Refers to the vertical platingvertical plating from the from the upper turn of bilge to the weather deck.upper turn of bilge to the weather deck.

The The upper strakeupper strake of the plating adjacent to of the plating adjacent to the strength deck is known as the the strength deck is known as the sheer sheer strakestrake..

As the As the sheer strakesheer strake is located at a great is located at a great distance from the neutral axis, it has distance from the neutral axis, it has greater thicknessgreater thickness than other strakes. than other strakes.

SIDE SHELL PLATINGSIDE SHELL PLATING

Where the spacing of Where the spacing of stiffening members on stiffening members on shell plating is shell plating is remarkably different remarkably different from the spacing, from the spacing, actual spaces is to be actual spaces is to be used in calculating used in calculating the thickness of shell the thickness of shell plating. plating.

SIDE SHELL WITH TRANSVERSE SIDE SHELL WITH TRANSVERSE FRAMINGFRAMING

SIDE AND BILGE STRUCTURESIDE AND BILGE STRUCTURE

CLASSIFICATION SOCIETY CLASSIFICATION SOCIETY REQUIREMENTSREQUIREMENTS

Thickness calculation of bottom plates be Thickness calculation of bottom plates be based on lateral pressure and longitudinal based on lateral pressure and longitudinal buckling strength of plate.buckling strength of plate.

Heavy shell plating are fitted in way of Heavy shell plating are fitted in way of attachments to stern frame for heel and attachments to stern frame for heel and boss plates in way of spectacle bossing as boss plates in way of spectacle bossing as these areas are subjected to heavy these areas are subjected to heavy stresses.stresses.