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 3 Prescriptive Buckling Requirements - 2 Hull Girder Stress

2 Hull Girder Stress

2.1 General

2.1.1 The hull girder bending stresses, σhg, in N/mm2, are determined according to Ch 6, Sec 2.

2.1.2 The hull girder shear stresses, τhg, in N/mm2, in the plate i are determined as follows:

where:

QTot(x) : Total vertical shear force, in kN, at the ship longitudinal location x, taken as follows:
  • For the design load combination S+D
    • For seagoing operations:
  • For flooded conditions at sea for bulk carriers having a length L of 150 m or above:
  • For the design load combination S
    • For harbour/sheltered water operations:

qvi : Contribution ratio in way of the plate i, as defined in Ch 5, Sec 1, [3.2.1].

ti-n50 : Net thickness of the plate i, in mm as defined in Ch 5, Sec 1, [3.2.1], used for shear stress calculation.

Qsw : Permissible positive or negative still water shear force for seagoing operation, in kN, at the hull transverse section considered, as defined in Ch 4, Sec 4, [2.3.3].

Qsw-p : Permissible positive or negative still water shear force for harbour/sheltered operation, in kN, at the hull transverse section considered, as defined in Ch 4, Sec 4, [2.3.4].

Qsw-f : Permissible positive or negative still water shear force in flooded condition at sea, in kN, at the hull transverse section considered, as defined in Ch 4, Sec 4, [2.3.5].

Qwv-LC : Vertical wave shear force in seagoing condition, in kN, in intact or flooded conditions at the hull transverse section considered for the considered dynamic load case, defined in Ch 4, Sec 4, [3.5.3].

2.2 Stress combinations

2.2.1 Each elementary plate panel and stiffeners are to satisfy the criteria defined in [3] with the following stress combinations:
  • a) Longitudinal stiffening arrangement:
  • Stress combination 1 with:
    • σx = σhg
    • σy = 0
    • τ = 0.7τhg
  • Stress combination 2 with:
    • σx = 0.7σhg
    • σy = 0
    • τ = τhg
  • b) Transverse stiffening arrangement:
  • Stress combination 1 with:
    • σx = 0
    • σy = 0hg
    • τ = 0.7 τhg
  • Stress combination 2 with:
    • σx = 0
    • σy = 0.7σhg
    • τ = τhg

where:

σhg : Hull girder bending stress in the elementary plate panel or stiffener, as defined in [2.1.1], in N/mm2.

τhg : Hull girder shear stress, in N/mm2, in the elementary plate panel or stiffener attached plate as defined in [2.1.2].

Parent topic: Section 3 Prescriptive Buckling Requirements
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