Clasification Society Rulefinder 2020 - Version 9.33 - Fix
Common Structural Rules - Common Structural Rules for Bulk Carriers and Oil Tankers, January 2019 - Part 1 General Hull Requirements - Chapter 8 Buckling - Section 4 Buckling Requirements for Direct Strength Analysis - 4 Vertically Stiffened Side Shell of Single Side Skin Bulk Carrier

4 Vertically Stiffened Side Shell of Single Side Skin Bulk Carrier

4.1 Buckling criteria

4.1.1 Side shell plating

The compressive buckling strength of the vertically stiffened side shell plating of single side skin bulk carrier is to satisfy the following criterion:

ηvss ≤ ηall

where:

ηvss : Maximum vertically stiffened side shell plating utilisation factor calculated according to Method A as defined in Ch 8, Sec 5, [2.2.1] and considering the following boundary conditions and stress combinations:
  • 4 edges simply supported (cases 1, 2 and 15 of Ch 8, Sec 5, Table 3):
    • Pure vertical stress:

      • The maximum vertical stress of stress elements is used with

        α = 1 and ψx = 1.

    • Maximum vertical stress combined with longitudinal and shear stress:

      • The maximum vertical stress in the buckling panel plus the shear and longitudinal stresses at the location where the maximum vertical stress occurs is used with

        α = 2 and ψx = ψy = 1.

      • The plate thickness to be considered in the buckling strength check is the one where the maximum vertical stress occurs.
    • Maximum shear stress combined with longitudinal and vertical stress:

      • The maximum shear stress in the buckling panel plus the longitudinal and vertical stresses at the location where maximum shear stress occurs is used with

        α = 2 and ψx = ψy = 1.

      • The plate thickness to be considered in the buckling strength check is the one where the maximum shear stress occurs.
  • The 2 shorter edges of the plate panel clamped (cases 11, 12 and 16 of Ch 8, Sec 5, Table 3):
    • Distributed longitudinal stress associated with vertical and shear stress:
      • The actual size of the buckling panel is used to define α.
      • The average values for longitudinal, vertical and shear stresses are to be used.
      • ψx = ψy = 1.
      • The plate thickness to be considered in the buckling strength check is the minimum thickness of the buckling panel.

4.1.2 Side frames

The buckling strength of side frames of single side skin bulk carriers is to satisfy the following criterion:

ηStiffener ≤ ηall

where:

ηStiffener : Maximum stiffener utilisation factor, as defined in Ch 8, Sec 5, [2.3].

Parent topic: Section 4 Buckling Requirements for Direct Strength Analysis
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