Common Structural Rules - Common Structural Rules for Bulk Carriers and Oil Tankers, January 2019 - Part 1 General Hull Requirements - Chapter 5 Hull Girder Strength - Appendix 2 Hull Girder Ultimate Capacity - 3 Alternative Methods
3 Alternative Methods
3.1 General
3.1.1 The bending moment-curvature relationship, M-χ, may be
established by alternative methods. Such models are to consider all the relevant effects
important to the non-linear response with due considerations of:
- a) Non-linear geometrical behaviour.
- b) Inelastic material behaviour.
- c) Geometrical imperfections and residual stresses (geometrical out-of-flatness of plate and stiffeners).
- d) Simultaneously acting loads:
- Bi-axial compression.
- Bi-axial tension.
- Shear and lateral pressure.
- e) Boundary conditions.
- f) Interactions between buckling modes.
- g) Interactions between structural elements such as plates, stiffeners, girders, etc.
- h) Post-buckling capacity.
- i) Overstressed elements on the compression side of hull girder cross section possibly leading to local permanent sets/buckle damages in plating, stiffeners etc (double bottom effects or similar).
3.2 Non-linear finite element analysis
3.2.1 Advanced non-linear finite element analyses models may be used for the assessment of the hull girder ultimate capacity. Such models are to consider the relevant effects important to the non-linear responses with due consideration of the items listed in [3.1.1].
3.2.2 Particular attention is to be given to modelling the shape and size of geometrical imperfections. It is to be ensured that the shape and size of geometrical imperfections trigger the most critical failure modes.
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