The cross-section classification according to EN 1993‑1‑1 and EN 1993‑1‑5 can be carried out automatically in the RF‑/STEEL EC3 add-on module. The maximum c/t ratios are specified in the standard for straight cross-section parts. There are no normative provisions for curved cross-section parts and therefore the cross-section classification cannot be performed for such cross-section parts.