Tuesday 17 January 2017

Topic - 14 SCANTLINGS

     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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