Section 3 Buckling strength of plates and stiffeners

3.1.1 The requirements of this Section apply to plate panels, and attached stiffeners subject to overall hull structure compression and shear stresses. The maximum design values computed are to be determined in accordance with Pt 4, Ch 5, 1.2 Structural analysis.

3.1.2 For states of stress which cannot be defined by one single reference stress, the buckling characteristics are to be based on recognised interaction formulae.

3.1.3 LR’s ShipRight buckling modules may be used for the buckling assessment of flat rectangular plate panels by direct calculation.

3.3.1 The elastic critical buckling stress of plating and stiffeners is to be determined in accordance with an agreed Code or Standard or according to Pt 3, Ch 4, 7.4 Design stress 7.4.1 and Pt 3, Ch 4, 7.5 Scantling criteria 7.5.3 in Pt 3, Ch 4, 7 Hull buckling strength, of the Rules and Regulations for the Classification of Ships (hereinafter referred to as the Rules for Ships).

3.4.1 The critical buckling stress in compression, corrected for yielding effects, , of plate panels and stiffeners, as derived from Pt 3, Ch 4, 7.4 Design stress 7.4.1 and Pt 3, Ch 4, 7.5 Scantling criteria 7.5.3 in Pt 3, Ch 4, 7 Hull buckling strength of the Rules for Ships, is to satisfy the following:

where

3.4.2 The critical buckling stress in shear, corrected for yielding effects, , of plate panels as derived from Pt 3, Ch 4, 7.4 Design stress 7.4.1 (c) in Pt 3, Ch 4, 7 Hull buckling strength of the Rules for Ships, is to satisfy the following:

where

3.4.5 In general, stresses are to be determined using net scantlings, i.e., no corrosion allowance included.