This article was translated by Google Translator View original text

In the cross-section design of a flat steel, I receive unusually high shear stresses from torsion in the STEEL EC3 add-on module, which can be refuted by means of a simple manual calculation. What is the error?

Answer

The cross-section selection error is most likely to occur:

For a steel design, a thin-walled flat steel cross-section should be selected instead of a rectangular solid cross-section, see Figure 1.

Figure 01 - Flat steel

The reason for the high shear stress for a solid cross-section is due to the existing stress points of the cross-section or the corresponding thickness of this stress point.

In the case of a thin-walled flat steel cross-section, there are four stress points at the corner points of the cross-section with the corresponding thickness t = 10 mm, see Figure 2.

Figure 02 - Stress points of flat steel

For a solid cross-section, however, there is another stress point in the center, where the maximum of height h or width b is assumed as the thickness t for this cross-section type. In this case, the width b is 200 mm, see Figure 3.

Figure 03 - Stress points of solid cross-section

This results in a small torsional resistance moment W t and a correspondingly high shear stress.

The solution is therefore the selection of a flat steel within the main program as described above.

Keywords

Implausible Result Shear stress Torsion

Downloads

Contact us

Contact to Dlubal

Did you find your question?
If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

+49 9673 9203 0

info@dlubal.com

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

Add-on Module

Design of steel members according to Eurocode 3

Price of First License
1,480.00 USD
RSTAB Steel and Aluminium Structures
STEEL EC3 8.xx

Add-on Module

Design of steel members according to Eurocode 3

Price of First License
1,480.00 USD
;