Home Products RFEM and RSTAB Add-on Modules Steel and Aluminium Structures Add-on Modules RF-/STEEL Cold-Formed Sections Module Extension
RF-/STEEL Cold-Formed Sections Module Extension
Cold-Formed Steel Member Design According to EC3
RF-/STEEL Cold-Formed Sections is an extension of the RF-/STEEL EC3 add-on module. With this program, you can perform ultimate and serviceability state design for cold-formed steel members according to the following standards:
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EN 1993-1-3
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EN 1993-1-5
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Features
- Available for cold-formed L, Z, C, channel, top-hat, and CL sections from the cross-section database, as well as for cold-formed (non-perforated) SHAPE-THIN 9 cross-sections
- Determination of the effective cross-section considering the local buckling and the distortional buckling
- Cross-section ultimate limit state, stability, and serviceability limit state designs according to EN 1993‑1‑3
- Design of local transverse forces for webs without stiffening
- Available for all National Annexes included in RF-/STEEL EC3
- RF-/STEEL Warping Torsion module extension (license required) for stability analysis according to the second-order analysis as stress analysis including consideration of the 7th degree of freedom (warping)
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Input
Since RF-/STEEL Cold-Formed Sections is fully integrated in RF-/STEEL EC3, the data is entered in the same way as for the usual design in this module. It is only necessary to select the design option for cold-formed cross-sections in the Details dialog box.
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Results
The design results are displayed in RF-/STEEL EC3 in the usual way.
Among other results, the corresponding result windows include the effective cross-section properties due to axial force N, bending moment My, bending moment Mz, internal forces, and design summary.
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Product Features Articles

SHAPE-THIN determines the effective cross-sections according to EN 1993-1-3 and EN 1993-1-5 for cold-formed sections. You can optionally check the geometric conditions for the applicability of the standard specified in EN 1993‑1‑3, Section 5.2.
The effects of local plate buckling are considered according to the method of reduced widths and the possible buckling of stiffeners (instability) is considered for stiffened sections according to EN 1993-1-3, Section 5.5.
As an option, you can perform an iterative calculation to optimize the effective cross-section.
You can display the effective cross-sections graphically.
Read more about designing cold-formed sections with SHAPE-THIN and RF-/STEEL Cold-Formed Sections in this technical article: Design of a Thin-Walled, Cold-Formed C-Section According to EN 1993-1-3.
Frequently Asked Questions (FAQ)
- Which cross-sections can I design with the "RF‑/STEEL Cold-Formed Sections" add-on module?
- Is it possible to model cold-formed sections in SHAPE‑THIN 8 and to design them in RF‑/STEEL Cold-Formed Sections?
- I am trying to manually check the deformations from the CRANEWAY add-on module. However, I obtain great deviations. How to explain the differences?
- What should be considered when using a failure of columns under tension in the RF‑/DYNAM Pro – Equivalent Loads add-on module?
- Why is there no stability analysis displayed in the results despite the activation of the stability analysis in RF‑/STEEL EC3?
- How can I model and design a crane runway girder with Dlubal Software?
- Is it possible to set user-defined values when viewing solid stress results?
- Why do I get large differences for the design of a longitudinally stiffened buckling panel in comparison with the German and Austrian National Annex?
- How are the signs for the release results of a line release and line hinges interpreted?
- How can I perform the stability analysis in RF‑/STEEL EC3 for a flat bar supported on edges, such as 100/5? Although the cross-section is rotated by 90° in RFEM/RSTAB, it is displayed as lying flat in RF‑/STEEL EC3.
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