Purpose
This
document summarizes the scantling sizing calculations for the hull structure of
the subject vessel. The subject vessel is an 80 m x 34 m x 9 m (molded)
unmanned barge intended for ocean service.
Procedure
Hull
scantling calculations are based on the requirements of the American Bureau of
Shipping (ABS) Rules for Building and Classing Steel Barges, 2014.
Introduction
The
amidships scantlings as specified in the Rules are to apply throughout the
midship 0.4L. End scantlings are not to extend for more than 0.1L from
each end of the barge. The reduction from the midship to the end scantlings is
to be affected in as gradual a manner as practicable. Sections having
appropriate section moduli or areas, in accordance with their functions in the
structure as stiffeners, columns or combinations of both, are to be adopted,
due regard being given to the thickness of all parts of the sections to provide
a proper margin for corrosion. It may be required that calculations be
submitted in support of resistance to buckling for any part of the barge’s
structure.
Dimensions
Definitions:
To
inner shell surfaces
L (LOA) molded - shell throws
outboard
L (scantling) 96% of waterline length at 85% of D
B (breadth) molded - shell throws
outboard
D (depth) molded - amidships at side
d (draught) molded - to summer load
line
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