Section
11 Superstructures, deckhouses and bulwarks
11.1 General
11.1.1 The requirements of this Section, unless specified otherwise, are applicable
to all ship types, NS1, NS2 and NS3.
11.1.2 The basic structural scantlings of NS1 ships are to be determined in
accordance with Vol 1, Pt 6, Ch 3, 3 NS1 scantling determination The basic structural scantlings of NS2 and NS3
ships are to be determined in accordance with Vol 1, Pt 6, Ch 3, 4 NS2 and NS3 scantling determination. Arrangements of the structure are to be in accordance with
the requirements of Vol 1, Pt 3, Ch 2, 7 Superstructures, deckhouses, bulwarks, sponsons and appendages
11.1.6 Superstructures, deckhouses and bulwarks should be positioned so as to avoid direct
weapon recoil, blast or efflux loads, however, where this is not possible they are to be
additionally examined for compliance with the requirements of Vol 1, Pt 6, Ch 3, 11.1 General 11.1.2 for the
loads defined in Vol 1, Pt 4, Ch 2, 9 Military installation and operational loads as applicable.
11.2 Forecastle requirements
11.2.1 The
forecastle side plating may be a continuation of the hull side shell
plating or fitted as a separate assembly. Where fitted as a separate
assembly, suitable arrangements are to be made to ensure continuity
of the effect of the sheerstrake at the break and at the upper edge
of the forecastle side. Full penetration welding is to be used.
11.2.2 The
deck plating thickness is to be increased by 20 per cent in way of
the end of the forecastle if this occurs at a position aft of 0,75L
R. No increase is required if the forecastle end
bulkhead lies forward of 0,8L
R. The increase
at intermediate positions of end bulkhead is to be obtained by interpolation.
11.3 Superstructures formed by extending side structures
11.3.1 The
side plating of such superstructures having a length of 0,15L
R or greater is to be increased in thickness by 25 per cent
at the ends of the structure, and is to be tapered into the sheerstrake, see
Vol 1, Pt 6, Ch 3, 5.3 Sheerstrake 5.3.1 This plating
is to be efficiently stiffened at the upper edge and supported by
web plates not more than 1,5 m from the end bulkhead. Proposals for
alternative arrangements, including the use of higher tensile steel,
will be individually considered.
11.3.2 Where
the superstructure contributes to the hull girder strength, the shear
capability of the superstructure may need to be verified.
11.4 Mullions
11.4.1 The
scantlings of mullions are to be not less than as required for a stiffener
in the same position.
11.4.2 When
determining the stiffener requirements, the width of effective plating
is in no case to be taken as greater than the distance between adjacent
window openings.
11.4.3 Where
significant shear forces are to be carried by superstructures and
deckhouses which have large windows, doors, vents and other openings
in their side structures, adequate shear rigidity is to be verified
by direct calculation.
11.5 Sheathing
|
| Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime
and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective
officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications
Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance
on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant
Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is
exclusively on the terms and conditions set out in that contract.
|
 |
|