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FAQ 002694 EN-US 03/27/2019

Wieland Götzler Add-on Modules STEEL EC3 RF-STEEL EC3

In an older model in RFEM 4 or RSTAB 7 I measured a DuenQ cross section or general cross section in STAHL EC3. At that time a cross-sectional class 1 or 2 was determined. I have now opened the model in RFEM 5 and now the cross section is classified only class 3 or 4. Why is that? Was the design more economical at the time?

Answer

The dimensioning of general cross-sections or DuenQ cross-sections in STEEL EC3 is always elastic, ie after class 3 or 4. Since the interaction conditions are restricted to a few cross-sections, no plastic dimensioning is possible for any cross-sectional shapes. In RFEM 4 and RSTAB 7, however, a cross-section could still be classified as class 1 or 2, although the subsequent design took place elastically.
To eliminate this ambiguity and to create consistency, the classification has also been changed to cross-sectional class 3 and 4.

Keywords

Steel construction Eurocode 3 RFEM4 RSTAB7 Classification EC3 Section classification Elastic Plastic

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RSTAB Steel and Aluminum Structures
STEEL EC3 8.xx

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Design of steel members according to Eurocode 3

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

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Design of steel members according to Eurocode 3

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