Why do I get large differences for the design of a longitudinally stiffened buckling panel in comparison with the German and Austrian National Annex?

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According to the national provision of ÖNORM EN 1993‑1‑5:2007, Section 4.5.3(3), it is possible to abandon the increase of σ_cr,c, allowed in the note, with respect to the elastic critical buckling stress σ_cr,sl of the longitudinal stiffener adjacent to the compression edge as this results in very conservative results with regard to the resulting reduction factor ρ_c for the buckling analysis according to ÖNORM EN 1993‑1‑5, Section 4.5.4(1), Equation 4.13. Image 01 shows an example of a longitudinally stiffened buckling panel, designed according to the Austrian National Annex.

Image 01 - Design According to Austrian National Annex

In DIN EN 1993‑1‑5, the note given in Section 4.5.3(3) applies, so it results in the following difference, see Image 02.

Image 02 - Design According to German National Annex

FAQ 004956 EN

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Why do I get large differences for the design of a longitudinally stiffened buckling panel in comparison with the German and Austrian National Annex?

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