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For a cross-section taken from the cross-section library of RSTAB/RFEM, the stresses calculated with RF-/STEEL differ from the stresses of the same cross-section calculated with SHAPE-THIN. What is the reason?

Answer

In RF-/STEEL, the stresses are calculated on stress points of the cross-section. The stress points defined for the cross-section can be displayed in the details of the cross-section. For the cross-section displayed in Figure 1, stress points are defined along the section. Thus, stress points (here stress points 1 and 9) are also present at the curves.
In SHAPE-THIN, you can only calculate stresses on elements. It is not possible to calculate stresses for point elements with which irregularities in the cross-section geometry such as roundings etc. are displayed. The stress points of the SHAPE-THIN cross-section are displayed in Figure 2. Thus, cross-sections with point elements may show minor variations in stresses due to different stress points.
Furthermore, in SHAPE-THIN you can calculate the stresses for the most unfavorable element edge or only for the member centerlines. In RF-STEEL, the stresses are calculated exclusively on the stress points.

Keywords

Stress Cross-section library Point element Element Stress point Element edge Element centerline

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Cross-Sections Thin-Walled
SHAPE-THIN 8.xx

Cross-Section Properties Software

Section properties, stress analysis, and plastic design of open and closed thin-walled cross-sections

Price of First License
1,120.00 USD
RFEM Steel and Aluminium Structures
RF-STEEL 5.xx

Add-on Module

Stress analysis of steel surfaces and members

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1,030.00 USD
RSTAB Steel and Aluminium Structures
STEEL 8.xx

Add-on Module

Stress analysis of steel members

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760.00 USD