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 - 3 Buckling Criteria
3 Buckling Criteria
3.1 Overall stiffened panel
3.1.1 The buckling strength of overall stiffened panels is to satisfy the following criterion:
ηOverall ≤ ηall
where:
ηOverall : Maximum utilisation factor as defined in Ch 8, Sec 5, [2.1].
3.2 Plates
3.2.1 The buckling strength of elementary plate panels is to satisfy the following criterion:
ηPlate ≤ ηall
where:
ηPlate : Maximum plate utilisation factor calculated according to SP-A, as defined in Ch 8, Sec 5, [2.2].
For the determination of ηPlate of the vertically stiffened side shell plating of single side skin bulk carrier between hopper and topside tanks, the cases 12 and 16 of Ch 8, Sec 5, Table 3 corresponding to the shorter edge of the plate panel clamped are to be considered together with a mean σy stress and ψy = 1.
3.3 Stiffeners
3.3.1 The buckling strength of stiffeners or 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].
Note 1: This capacity check can only be fulfilled when the overall stiffened panel capacity, as defined in [3.1.1], is satisfied.
3.4 Vertically corrugated transverse and longitudinal bulkheads
3.4.1 The shear buckling strength of vertically corrugated transverse and longitudinal bulkheads is to satisfy the following criterion:
ηShear ≤ ηall
where:
- For longitudinal bulkheads: hull girder shear stress defined in [2.1.2]
- For transverse bulkheads: shear stress in the corrugation defined in Pt 2, Ch 1, Sec 3, [3.2.1].
τc : Shear critical stress, in N/mm2, as defined in Ch 8, Sec 5, [2.2.3].
3.5 Horizontally corrugated longitudinal bulkhead
3.5.1 Each corrugation, within the extension of half flange, web and half flange, is to satisfy the following criterion:
η ≤ ηall
where:
η : Overall column utilisation factor, as defined in Ch 8, Sec 5, [3.1].
3.6 Struts, pillars and cross ties
3.6.1 The compressive buckling strength of struts, pillars and cross ties is to satisfy the following criterion:
η ≤ ηall
where:
η : Maximum buckling utilisation factor of struts, pillars or cross ties, defined in Ch 8, Sec 5, [3.1].
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