4.2 Hull Girder Forces and Moments
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.836 – Recommendation on Loading Instruments – (Adopted on 6 February 1998) - Annex 2 - No.48 (1997) - Recommendation on Loading Instruments - 4 Functional Specification - 4.2 Hull Girder Forces and Moments

4.2 Hull Girder Forces and Moments

  4.2.1 The loading program should be capable of calculating the following hull girder forces and moments in accordance with IACS Unified Requirements and, where applicable, the Society Rules and Regulations:

  • 1. Still Water Shear Force (SWSF) including the shear force correction, where applicable.

  • 2. Still Water Bending Moment (SWBM).

  • 3. Still Water Torsion Moment (SWTM), where applicable.

  • 4. For ships with relatively large deck opening, additional considerations such as torsional loads should be considered.

  4.2.2 The data which should be provided to or accepted by the Society is specified in Table 2.

Table 2 Data to be provided to/or accepted by the Society

Calculation Data to be provided to or accepted by the Society
Still Water Shear Force (SWSF) 1. The read-out points (frame locations) for the SWSF calculations. These points are normally selected at the position of the transverse bulkhead or other obvious boundaries. Additional read-out points may be specified between the bulkheads of long holds or tanks or between container stacks.
2. Shear force correction factors and method of application.
3. The permissible seagoing and harbour SWSF limits at the read-out points specified in (1). Where appropriate, additional sets of permissible SWSF values may be specified.
Still Water Bending Moment (SWBM) 1. The read-out points (frame locations) for the SWBM calculations. These points are normally selected at the position of the transverse bulkhead, mid-hold or other obvious boundaries.
2. The permissible seagoing and harbour SWBM limits at the read-out points specified in (1). Where appropriate, additional sets of permissible SWBM values may be specified.
Still Water Torsion Moment (SWTM), where applicable 1. The read-out points (frame locations) for the SWTM calculations.
2. The permissible limits at the read-out points specified in (1).

  4.2.3 The calculated forces and moments should be displayed in both graphical and tabular format, including the percentage of permissible values. The screen and hard copy output should display the calculated forces or moments, and the corresponding permissible limit, at each specified read-out point. Alternative limits, e.g. vertical still water bending and torsion may be considered in accordance with the Society's Rules.

Parent topic: 4 Functional Specification
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