FAQ 003440 EN

Helpful Questions & Answers

  • Frequently Asked Questions (FAQs)

I design a set of members by using the equivalent member method in RF‑/STEEL EC3, but the calculation fails. The system is unstable, delivering the message "Non-designable - ER055) Zero value of the critical moment on the segment."What could be the reason?

Answer

Please check if all sets of members selected for the design are straight sets of members. The equivalent member method is only applicable for straight sets of members with a uniform cross-section, so no taper is applicable, for example. In this case, use the preset General Method.

Keywords

Equivalent member method General method Set of members Unstable Stability analysis

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  • Updated 7 September 2021

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