I design an asymmetric cross-section and get the message: "Non-designable: ER051) Moment about z‑axis on asymmetric cross-section, taper or set of members." Why?

Answer

The reason for this warning is that asymmetric cross-sections cannot be designed by using the methods mentioned in 6.3.3 of EN 1993‑1‑1 or General Method according to 6.3.4 of EN 1993‑1‑1.

You can perform the stability analysis as cross-section design according to the second-order theory, which is possible by using the add‑on modules FE‑LTB or STEEL Warping Torsion.

Keywords

Asymmetric cross-section ER051 Stability analysis Equivalent member method Set of members Second-order analysis Not designable

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