Section 1 General
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Inland Waterways Ships, July 2022 - Part 3 Ship Structures (General) - Chapter 5 Fore End and Aft End Structure - Section 1 General

Section 1 General

Parent topic: Chapter 5 Fore End and Aft End Structure

1.1 Application

1.1.1 This Chapter applies to all types of ships covered by Pt 4 Ship Structures (Ship Types) except where otherwise specifically stated.

1.1.2 The requirements given are those specific to the fore end and aft end regions, see Pt 3, Ch 3, 2.3 Definition of fore end region and Pt 3, Ch 3, 2.4 Definition of aft end region.

1.1.3 Requirements for the cargo space structure are as detailed in the relevant Chapters of Pt 4 Ship Structures (Ship Types) for the particular ship type.

1.2 Structural configuration

1.2.1 The Rules provide for both longitudinal and transverse framing systems or a combination of both.

1.3 Structural continuity

1.3.1 Suitable scarfing arrangements are to be made to ensure continuity of strength and the avoidance of abrupt structural changes.

1.3.2 Where longitudinal framing terminates and is replaced by a transverse system, adequate arrangements are to be made to avoid an abrupt changeover.

1.3.3 Where steps or breaks are situated in the upper deck, suitable scarfing arrangements are to be provided, and the sheerstrake is to be increased in thickness in this region. This also applies to the ends of a trunk deck.

1.3.4 In ships having continuous side tanks or double skin construction in way of the cargo spaces, the longitudinal bulkheads are to be continued as far forward and aft as is practicable and are to be suitably tapered at their ends. Where, due to the ship’s form, these bulkheads are stepped, suitable scarfing is to be arranged.

1.4 Symbols and definitions

1.4.1 The following symbols and definitions are applicable to this Chapter unless otherwise stated:

L, B, D and T are as defined in Pt 3, Ch 1, 6.1 Principal particulars

s = spacing of secondary stiffeners, i.e. frames, beams, or stiffeners, in metres
S = spacing, or mean spacing, of primary members, i.e. girders, transverses, webs, etc. in metres
l = overall length of stiffening member, in metres, see Pt 3, Ch 3, 3.2 Geometric properties of section
le = effective length of stiffening member, in metres, see Pt 3, Ch 3, 3.3 Determination of span point
I = inertia of stiffening member, in cm4, see Pt 3, Ch 3, 3.2 Geometric properties of section
Z = section modulus of stiffening member, in cm3, see Pt 3, Ch 3, 3.2 Geometric properties of section
t = thickness of plating, in mm
P p = maximum designed shaft power of the propulsion machinery installed in the ship, in kW
H p = maximum designed shaft power, in shp, of propulsion machinery installed in the ship

1.4.2 For the purpose of this Chapter the forward perpendicular (F.P.) is defined as the forward limit of the Rule length L, and the aft perpendicular (A.P.) is defined as the after limit of the Rule length L.

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