The Steel Design add-on helps you, among other things, to design general cross-sections that are not predefined in the cross-section library. To do this, create a cross-section in the RSECTION program and then import it into RFEM/RSTAB. Depending on the design standard that you have used, you can select from various design formats. One of them is, for example, the equivalent stress analysis. Do you have a license for RSECTION and Effective Cross-Sections? Then you can also perform the design checks that take into account the effective cross-section properties according to EN 1993‑1‑5.
Steel Design | Design Checks for General RSECTION Cross-Sections
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