Steel Design Add-on
Product Feature
Compared to the RF‑/STEEL EC3 add-on module (RFEM 5 / RSTAB 8), the following new features have been added to the Steel Design add-on for RFEM 6 / RSTAB 9:
- In addition to Eurocode 3, other international standards are integrated (such as AISC 360, CSA S16, GB 50017, SP 16.13330)
- Consideration of hot-dip galvanizing (DASt guideline 027) in the fire protection design according to EN 1993‑1‑2
- Input option for transverse stiffeners that can be taken into account in the shear buckling analysis
- Lateral-torsional buckling can also be checked for hollow sections (for example, relevant for slender, high rectangular hollow sections)
- Automatic detection of members or member sets valid for the design (for example, automatic deactivation of the members with invalid material or the members already contained in a set of members)
- Design settings can be adjusted individually for each member
- Graphical display of the results in the gross section or the effective section
- Output of the used design check formulas (including a reference to the used equation from the standard)
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Parameterizing Models in RFEM 6/RSTAB 9
RFEM and RSTAB programs provide parameterized input as an advantageous product feature to create or adjust models by means of variables. This article will show you how to define global parameters and use them in formulas to determine numerical values.

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Steel Design | Fire Resistance | Design
The design checks for the selected members are carried out, taking into account the governing component temperature. Cross-section design checks and stability analyses are performed in the Steel Design add-on according to EN 1993‑1‑2, Section 4.2.3. The necessary reduction factors and coefficients are stored accordingly and are considered when determining the load-bearing capacity.
The effective lengths for the equivalent member design are taken directly from the strength entries and do not have to be entered again.
In each design, the cross-section classification is carried out first; for the cross-sections of Class 4, the design is then performed automatically according to EN 1993‑1‑2, Annex E.
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My results of the calculation with Torsional Warping are implausible. What could be the reason?
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- I have activated Steel Design in my model and defined design types for the members. Why can I not design the superordinate member set?
- Where can I find the materials for the corresponding National Annexes in RFEM 6 and RSTAB 9?
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Associated Products
- How do I define a member as a cantilever and not as supported at both ends for serviceability or deflection design?