Why do I get different results when calculating stresses of flat, square or octagonal steel, compared to the manual calculation?
Especially in the case of the shear stresses due to shear force and torsion, they deviate considerably.


The stress calculations are performed on stress points of a cross-section.
The cross-sections of the cross-section types
  • Flat steel
  • Square steel
  • Hexagonal steel
  • Octagonal steel
  • Wide flats
receive only circumferential stress points at the corner points.
If a member with one of these cross-sections is subjected to the shear force or torsion, it is necessary to select solid cross-sections.


Flat steel Square steel Shear stress Shear force Torsion

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RSTAB Steel and Aluminum Structures
STEEL 8.xx

Add-on Module

Stress analysis of steel members

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Stress analysis of steel surfaces and members

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