1406x
003435
2021-06-07

Question

I am trying to design an open, unsymmetric aluminum cross-section in RF‑/ALUMINUM and I am get the warning "Non-designable - 1022) General cross-section — Check of stability is not available". What is the reason?


Answer:
The reason is that there is no stability analysis for unsymmetrical, open cross-sections according to EN 1999‑1‑1 if the compressive normal forces and bending moments are effective.
You can neglect the bending moments in Details, on the Stability tab, by selecting the corresponding filter. Then, the flexural buckling design is performed without moments. However, this is on your own responsibility. Another way is to check the stability according to the second-order analysis, which would be possible using the RF‑/FE‑LTB add-on module.