Section 6 Side shell structure
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Inland Waterways Ships, July 2022 - Part 4 Ship Structures (Ship Types) - Chapter 2 Ferries and Roll on-Roll off Ships - Section 6 Side shell structure

Section 6 Side shell structure

Parent topic: Chapter 2 Ferries and Roll on-Roll off Ships

6.1 General

6.1.1 This Section covers the arrangements and requirements for a transversely or longitudinally framed side shell structure in single and double skin ships.

6.1.2 The scantlings of the double skin structure, except side shell plating, are to comply with Table 2.6.1 Side shell structure (single skin ships). The scantlings given in this Table are based on end connections in accordance with Pt 3, Ch 10, 3 Secondary member end connections. Where brackets having arm lengths differing from the standard are fitted, the modulus of the stiffening member is to be corrected in accordance withPt 3, Ch 10, 3.7 Correction of stiffening member modulus in relation to end connections.

Table 2.6.1 Side shell structure (single skin ships)

Item Parameter Requirement
(1) Side frame Modulus Z = 7hfksle 2 cm3
(2) Side longitudinals Modulus Z = (4,6 + 0,0342L 1) h f ks le 2 cm3
(3) Side transverses Modulus Z = 10h f kSle 2 cm3 See Note
(4) Stringers Modulus Z = 6,6hfkS le2 cm3
(5) Webs supporting stringers and girders Modulus Z is to be determined from calculations using a stress of 98/k N/mm2 assuming fixed ends, in association with a head, hf. See Note
Symbols
L, S, s, le, Z, k and I are as defined in Pt 4, Ch 2, 1.5 Symbols and definitions 1.5.1
hf = the vertical distance, in metres, from the middle of the effective length of the stiffening member under consideration to the deck at side or to a line at T + 0,4 m for Zone 3, T + 0,7 m for Zone 2, T + 1,0 m for Zone 1, whichever is the lesser, but is to be taken as not less than 2,0 m
L1 = L but is to be not less than 40 m, nor more than 100 m

Note The section modulus of side transverses or webs at top and bottom is to be not less than half the section modulus of the bottom and deck transverses in way.

6.1.3 The side shell structure for double skin ships is to comply with the requirements of Pt 4, Ch 1, 11 Double skin structure.

6.2 Web frames

6.2.1 Web frames forming a ring system with floors or bottom transverses and deck transverses, are to be fitted at a spacing not exceeding 8 m.

6.3 Frames

6.3.1 When the side frames are supported by an effective system of stringers and web frames, the Rule section modulus of side frames, ascertained ignoring the stringers, may be reduced by 30 per cent.

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