I design a single-symmetric cross-section (T‑section) and get the message "Non-designable: ER056) The general method is applicable only for I‑sections." Why?

Answer

Since the method according to 6.3.3 of EN 1993‑1‑1 is only applicable for double-symmetric cross-sections in the case of structural components subjected to bending and compression, the add‑on module designs these components by using General Method according to 6.3.4 of EN 1993‑1‑1. This method is applicable to any single-symmetric cross-sections. In Germany, however, only I‑sections are permitted, which is why the warning appears.

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 RF‑/FE‑LTB or RF‑/STEEL Warping Torsion.

As an alternative, you can also allow General Method for non I‑sections in the "National Annex" dialog box, but differ from the National Attachment here.

Keywords

Non I-section Not designable Stability analysis Equivalent member method General Method Second-order analysis ER056

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RSTAB Steel and Aluminum Structures
STEEL EC3 8.xx

Add-on Module

Design of steel members according to Eurocode 3

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RFEM Steel and Aluminum Structures
RF-STEEL EC3 5.xx

Add-on Module

Design of steel members according to Eurocode 3

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