3.4 Bending strength check
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.168(79) - Standards and Criteria for Side Structures of Bulk Carriers of Single-Side Skin Construction - (Adopted on 9 December 2004) - Annex 2 - Renewal Criteria for Side Shell Frames and Brackets in Single-Side Skin Bulk Carriers not Built in Accordance with the Standards for Side Structures in Single-Side Skin Bulk Carriers - 3 Strength check criteria - 3.4 Bending strength check

3.4 Bending strength check

 When the lower bracket length or depth do not comply with requirements in annex 1, the actual section modulus, in cm3, of the brackets and side frames at sections a) and b) shall be not less than:

  • .1 at section a):

  • .2 at section b):

where:
Pfr,a = pressure force defined in 3.1.1
h = side frame span, in m, defined in figure 1
σa = allowable normal stress, in N/mm2, defined in 3.2
ma, mb = bending moment coefficients defined in table 2

The actual section modulus of the brackets and side frames shall be calculated about an axis parallel to the attached plate, based on the measured thicknesses. For pre-calculations, alternative thickness values may be used, provided they are not less than:

  • .1 tREN, for the web thickness;

  • .2 the minimum thicknesses allowed by the renewal criteria for flange and attached plating of a classification society which is recognized by the Administration in accordance with the provisions of SOLAS regulation XI-1/1, or by applicable national standards of the Administration which provide an equivalent level of safety.

The attached plate breadth is equal to the frame spacing, measured along the shell at midspan h.

If the actual section moduli at sections a) and b) are less than the values Za and Zb, the frames and brackets shall be renewed or reinforced in order to obtain actual section moduli not less than 1.2 Za and 1.2 Zb, respectively.

In such a case, renewal or reinforcements of the flange shall be extended over the lower part of side frames, as defined in figure 1.

Parent topic: 3 Strength check criteria
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