Section 6 Shell envelope framing
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 4 Ship Structures (Ship Types) - Chapter 8 Container Ships - Section 6 Shell envelope framing

Section 6 Shell envelope framing

Parent topic: Chapter 8 Container Ships

6.1 General

6.1.1 The requirements of Pt 4, Ch 1, 6 Shell envelope framing are to be applied, together with the requirements of this Section.

6.1.2 The ShipRight FDA Procedure, Structural Detail Design Guide (SDDG) indicates recommended examples of configurations for end connections of shell envelope longitudinals.

6.2 Side shell primary supporting structure

6.2.1 A primary supporting structure for side shell envelope framing is to be provided of either single or double skin construction. This normally consists of a combination of vertical transverse webs and horizontal side stringers/decks.

6.2.2 Transverse webs supporting side shell envelope framing are to be arranged in line with the floors in the double bottom to ensure continuity of transverse strength.

6.2.3 The scantlings of double skin primary structure, including thickness of side shell envelope plating, are to be verified by direct calculations in accordance with Pt 4, Ch 8, 14.2 Procedures for verification of primary structure scantlings.

6.2.4 The scantlings of single skin primary structure are to comply with Pt 4, Ch 1, 6.4 Primary supporting structure. Alternatively the scantlings are to be verified by direct calculations in accordance with Pt 4, Ch 8, 14.2 Procedures for verification of primary structure scantlings.

6.3 Side stringers in double skin construction

6.3.1 The scantlings of side stringers are to satisfy the requirements of Pt 4, Ch 8, 3 Longitudinal strength, Pt 4, Ch 8, 6.2 Side shell primary supporting structure and Pt 4, Ch 8, 6.5 Minimum thickness of transverse webs/side stringers in double skin construction.

6.3.2 In addition, the scantlings of watertight side stringers are to satisfy the requirements of Pt 4, Ch 1, 9 Bulkheads.

6.4 Transverse webs in double skin construction

6.4.1 The scantlings of transverse webs are to satisfy the requirements of Pt 4, Ch 8, 6.2 Side shell primary supporting structure and Pt 4, Ch 8, 6.5 Minimum thickness of transverse webs/side stringers in double skin construction.

6.4.2 Transverse webs are to be efficiently stiffened, and the thickness increased locally where necessary on account of high shear stress.

6.4.3 Where, towards the end of the ship, the width of transverse webs reduces from that assumed in the direct calculations, the thickness may require to be increased locally.

6.5 Minimum thickness of transverse webs/side stringers in double skin construction

6.5.1 Transverse webs and side stringers are to have a thickness, t, not less than:

t = 7,5 + 0,015L or 9 mm, whichever is the lesser.
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.