The "Different buckling curves" option (Image 01) uses different buckling curves for the existing stresses:
- for stresses in the x-direction, the equations according to Ch. 4.4 (2) of EN 1993‑1‑5,
- for stresses in the z-direction, the formula according to Annex B.1,
- for shear stresses, see Table 5.1.
If the "General buckling curve" option is used (Image 02), the reduction factors are generally calculated according to the formula in Annex B.1. This option is usually on the safe side, but you can achieve more economical results by using the "Various buckling curves" option.
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