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2021-04-27

I am designing an asymmetric cross-section and I got 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 using the methods mentioned in 6.3.3 of EN&nbso;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 analysis, which is possible using the add-on modules FE‑LTB or STEEL Warping Torsion.


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Single-Span Beam with Asymmetric Cross-Section

Number of Nodes 2
Number of Lines 1
Number of Members 1
Number of Surfaces 0
Number of Solids 0
Number of Load Cases 1
Number of Load Combinations 0
Number of Result Combinations 0
Total Weight 0.306 tons
Dimensions (Metric) 5.000 x 0.000 x 0.000 m
Dimensions (Imperial) 16.4 x 0 x 0 feet

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