Steel Design for RFEM 6 / RSTAB 9

Product Description

  • Steel Structures

Strength and Stability

Most Suitable Software for Structural Analyses According to Eurocodes

“We decided to work with RFEM by Dlubal Software for the calculation of our three-dimensional steel structures after the analysis of different offers on the market. It is the software which seems to be the most suitable for analyses according to Eurocode standards. With its clear and intuitive interface, the data and the results can be entered visibly and editably in a smooth and efficient way which minimizes the effect of a "black box".

The technical support is remarkably patient, competent and responds quickly which confirmed our decision in favor of RFEM. The tutorials, the blog and the detailed user manuals allow a self-study and a comprehensive initial training and then a continuous learning of new functions. A further positive aspect is the modular structure which makes it possible to enlarge the offer based on the same main program without important learning phase. Even if we decide tomorrow to focus more in timber, aluminum or glass structures, the calculation will not be a blocking element for us.”

The Steel Design add-on allows for cross-section resistance design and stability analysis of steel member structures in the ultimate limit state. The input and result evaluation are completely integrated in the user interface of the structural FEA software RFEM and the frame & truss analysis software RSTAB.



  • A wide range of available sections, such as rolled I-sections; channel sections; T-sections; angles; rectangular and circular hollow sections; round bars; symmetrical and asymmetrical, parametric I-, T-, and angle sections; built-up cross-sections (suitability for design depends on the selected standard)
  • Design of general RSECTION cross-sections (depending on the design formats available in the respective standard), for example, equivalent stress design
  • Design of tapered members (design method depending on the standard)
  • Adjustment of the essential design factors and standard parameters is possible
  • Flexibility due to detailed setting options for basis and extent of calculations
  • Fast and clear results output for an immediate overview of the distribution of results after the design
  • Detailed output of design results and essential formulas (comprehensible and verifiable result path)
  • Numerical results clearly arranged in tables and graphical display of the results in the model
  • Integration of the output into the RFEM/RSTAB printout report

Cross-Section Resistance

  • Design of tension, compression, bending, shear, torsion, and combined internal forces
  • Tension design with consideration of a reduced section area (for example, hole weakening)
  • Automatic classification of cross-sections to check local buckling
  • Internal forces from the calculation with Torsional Warping (7 DOF) are taken into account by means of the equivalent stress check (currently not for the design standards AISC 360‑16 and GB 50017).
  • Design of cross-sections of Class 4 with effective cross-section properties according to EN 1993‑1‑5 (licenses for RSECTION and Effective Sections are required for the RSECTION cross-sections)
  • Shear buckling check according to EN 1993‑1‑5 with consideration of transverse stiffeners
  • Design of stainless steel components according to EN 1993‑1‑4

Stability Analysis

  • Stability analyses for flexural buckling, torsional buckling, and flexural-torsional buckling under compression
  • Graphical input and check of the defined nodal supports and effective lengths for a stability analysis
  • Lateral-torsional buckling analysis of the structural components subjected to moment loading
    • Depending on the standard, a choice between user-defined input of Mcr, analytical method from the standard, and use of internal eigenvalue solver
    • Consideration of a shear panel and a rotational restraint when using the eigenvalue solver
    • Graphical display of a mode shape if the eigenvalue solver was used
  • Stability analysis of structural components with the combined compression and bending stress, depending on the design standard
  • Comprehensible calculation of all necessary coefficients, such as the factors for considering moment distribution or interaction factors
  • Alternative consideration of all effects for the stability analysis when determining internal forces in RFEM/RSTAB (second-order analysis, imperfections, stiffness reduction, possibly in combination with the Torsional Warping (7 DOF) add-on)


The structural system is entered and the internal forces are calculated in the programs RFEM and RSTAB. There is access to extensive material and cross-section libraries; moreover, it is possible to create general cross-sections using the RSECTION program.

Steel Design is completely integrated into the main programs and automatically takes into account the structure and the available calculation results. Further entries for the steel design, such as effective lengths, cross-section reductions, or design parameters, are assigned to the objects to be designed. It is possible to select the elements graphically using the [Select] function.



After the design, the performed design checks are displayed in a table. All result details can be displayed and retraced using the clearly arranged design formulas.

The design checks are carried out at all governing locations of the members and displayed graphically as a result diagram. Furthermore, detailed graphics, such as the stress distribution on a cross-section or the governing mode shape, are available in the result output.

All input and result data are part of the RFEM/RSTAB printout report. You can customize the report's content and the desired output detail for the individual designs.



  • Complete integration in RFEM/RSTAB
  • Simple input for cross-section and stability checks of all members in the model
  • Consideration of internal forces from the calculation with Torsional Warping (7 DOF)
  • Stress analysis and stability analysis possible for any cross-section and structure (with RSECTION and, if necessary, warping torsion)
  • Module-internal eigenvalue solver for lateral-torsional buckling analysis (determination of Mcr) with graphic representation of the eigenmode
  • Detailed documentation of the performed design checks with the output of design formulas
  • Extensive material/cross-section library

Manual for Steel Design for RFEM 6


Customer Projects

Customer Projects Designed with Dlubal Products

Fascinating customer projects designed with the Dlubal structural analysis software.


2,450.00 EUR

The prices apply to the use of the software in all countries.

Seismic Design According to EC 8 in RFEM 6 and RSTAB 9

Seismic Design According to Eurocode 8 in RFEM 6 and RSTAB 9

Webinar 11 October 2022 2:00 PM - 3:00 PM CEST

Online Training | English

Eurocode 3 | Steel Structures According to DIN EN 1993-1-1

Online Training 17 November 2022 9:00 AM - 1:00 PM CET

3D Model of the Vocational School in RFEM (© Eggers Tragwerksplanung GmbH)

Special Solutions

First, the two-part Optimization & Costs / CO2 Emission Estimation add-on finds suitable parameters for parameterized models and blocks via the artificial intelligence (AI) technique of particle swarm optimization (PSO) for compliance with common optimization criteria. Second, this add-on estimates the model costs or CO2 emissions by specifying unit costs or emissions per material definition for the structural model.

Price of First License
1,650.00 EUR
Cross-Laminated Timber (CLT) Building


The Multilayer Surfaces add-on allows you to define multilayer surface structures. The calculation can be carried out with or without the shear coupling.

Price of First License
1,250.00 EUR