I am trying to design an open, asymmetrical aluminum cross-section in RF-/ALUMINUM and receive the warning 'Non-designable — 1022) General Cross-section — Stability Check Is Not Available'. What is the reason and what can I do?

Answer

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

Keywords

Non-designable Open Unsymmetrical Stability analysis Warning 1022

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