Section 8 Shell envelope framing
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 9 Passenger Ships - Section 8 Shell envelope framing

Section 8 Shell envelope framing

Parent topic: Chapter 9 Passenger Ships

8.1 General

8.1.1 Requirements are given in this Section for both longitudinal and transverse framing systems. Where longitudinal framing is not adopted over the full length of the ship, it is to be efficiently scarfed into the transverse framing system.

8.1.2 The scantlings of side frames in the midship region which are based on end connections in accordance with Pt 3, Ch 10, 3 Secondary member end connections, are to comply with the requirements given in Table 9.8.1 Shell side frames and longitudinals. Where brackets having arm lengths differing from the standard are fitted, the frame modulus is to be corrected in accordance with Pt 3, Ch 10, 3.7 Correction of stiffening member modulus in relation to end connections.

Table 9.8.1 Shell side frames and longitudinals

Location Modulus
Clear of tanks  
Frames ZF = 1,2D1 ks(2,5H2 + 0,03B2 + 6) cm3
Side shell longitudinals ZSL = 6ksle2 h5 + 4 cm3
Side transverses longitudinal framing system See Pt 4, Ch 9, 8.3 Longitudinal shell framing 8.3.1
Side frames of combination system in way of bottom/deck transverse Z = 2Z F cm3
In way of O.F. or water tanks The greater of:
Frames ZTF = ZF
  ZTF = 4,3ksle 2h4 + 4 cm3
Side shell longitudinals The greater of:
  ZTSL = ZSL
  ZTSL = 4,3ksle2h4 + 4 cm3
Side transverses longitudinal framing system See Pt 4, Ch 9, 8.3 Longitudinal shell framing 8.3.1
Side frames of combination system in way of bottom/deck transverse Z = 2Z TF cm3
Symbols
L, B, s, k and Z as defined in Pt 4, Ch 9, 1.14 Symbols and definitions 1.14.1
le = effective length of stiffening member, in metres, see Pt 3, Ch 3, 3.3 Determination of span point
D1 = D, but need not be taken greater than T + 0,4 m for Zone 3, T + 0,7 m for Zone 2, T + 1,0 m for Zone 1
H = vertical framing depth, in metres, from the top edge of floor or tank top, to the deck at side as shown in Figure 5.4.1 Framing depth in Pt 3, Ch 5
h4 = load head, in metres, measured vertically from the middle of the effective length to a point 1 metre above the top of the tank, or to the top of the overflow, whichever is the greater
h5 = load head, in metres, measured vertically from the middle of the effective length to the deck at side or to a point T + 0,4 m for Zone 3, T + 0,7 m for Zone 2, T + 1,0 m for Zone 1 above baseline, whichever is the lesser, but to be taken as not less than 1,5 m

8.2 Transverse shell framing

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

8.2.2 Where a combination framing system is adopted (shell transverse and bottom deck longitudinal framing) a transverse ring system is to be arranged in way of the supports of the longitudinal stiffening members. The section modulus of the side frames in way of the bottom and deck transverse is to be increased by 100 per cent, and the end connections are to comply with the requirements of Pt 3, Ch 10, 3 Secondary member end connections. Brackets at the top and bottom of the side frames are to be connected to the respective adjacent deck and bottom longitudinals. When the frames are carried through the bilge radius, they may be directly connected to the outboard longitudinal.

8.3 Longitudinal shell framing

8.3.1 Longitudinal stiffening members are to be supported by shell transverses which are to comply with the requirements of Table 9.8.1 Shell side frames and longitudinals. End brackets may be omitted if the modulus of the shell transverse at the intersection with the bottom transverse is equal to that of the bottom transverse, and at the intersection with the deck transverse is at least equal to that of the deck transverse. The face bar of the side transverse is to be welded to the face bar of the bottom and deck transverse. The web plate of the bottom and deck transverse is to be stiffened in line with the face bar of the side transverse.

8.3.2 The shell transverses are to form a ring system with bottom and deck transverses.

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.