Answer:
According to EN 1993‑1‑5, Chap. 10 (3), Note 1 and DIN 188800‑3, El. (501), Note 1, the design in RF‑/PLATE‑BUCKLING is always carried out on the entire buckling panel since any existing stiffeners are considered in the FE model.
Thus, design checks for single and partial panels are omitted.