Torsional Warping (7 DOF) for RFEM 6 / RSTAB 9

Product Description

  • Add-on Module of Category 'Other'

Consideration of Cross-Section Warping as Additional Degree of Freedom



  • Consideration of the 7th degree of freedom directly in the RFEM/RSTAB model (thus, real consideration of the stiffnesses of the connected elements)
  • No need to define the equivalent spring stiffness or support conditions for a separated structural system
  • Determination of critical load factors and mode shapes for lateral-torsional buckling (in combination with the Stability Analysis add-on)
  • Structural calculation according to geometrically linear, second-order, and large deformation analysis
  • Possible to consider imperfections and stiffness reduction
  • Use of internal forces from the calculation with warping torsion in the design add-ons

Do you want to calculate members? The '''Torsional Warping (7 DOF)''' add-on allows you to consider the cross-section warping as an additional degree of freedom when calculating members in RFEM and RSTAB. This provides you with more options.



* Consideration of 7 local deformation directions (ux, uy, uz, φx, φy, φz, ω) or 8 internal forces (N, Vu, Vv, Mt,pri, Mt,sec, Mu, Mv, Mω) when calculating member elements
* Usable in combination with a structural analysis according to linear static, second-order, and large deformation analysis (imperfections can also be taken into account)
* In combination with the Stability Analysis add-on, allows you to determine critical load factors and mode shapes of stability problems such as torsional buckling and lateral-torsional buckling
* Consideration of end plates and transverse stiffeners as warping springs when calculating I-sections with automatic determination and graphical display of the warping spring stiffness
* Graphical display of the cross-section warping of members in the deformation
* Full integration with RFEM and RSTAB


* You can activate or deactivate the use of torsional warping in the Add-ons tab of the model's Base Data.
* After activating the add-on, the user interface in RFEM is extended by some new entries in the navigator, tables, and dialog boxes.


You can perform the calculation of the warping torsion on the entire system. Thus, you consider the additional 7th degree of freedom in the member calculation. The stiffnesses of the connected structural elements are automatically taken into account. It means, you don't need to define equivalent spring stiffnesses or support conditions for a detached system.

You can then use the internal forces from the calculation with warping torsion in the add-ons for the design. Consider the warping bimoment and the secondary torsional moment, depending on the material and the selected standard. A typical application is the stability analysis according to the second-order theory with imperfections in steel structures.

Did you know that The application is not limited to thin-walled steel cross-sections. Thus, it is possible for you, for example, to perform the calculation of the ideal overturning moment of beams with solid timber cross-sections.

Online Manual | Torsional Warping (7 DOF)



1,650.00 EUR

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

Online Training | English

RFEM 6 | Students | Introduction to Steel Design

Online Training 15 May 2024 4:00 PM - 5:00 PM CEST

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

Special Solutions

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. Furthermore, 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
Pushover Analysis

Pushover Analysis for RSTAB 9

Dynamic Analysis

Earthquakes may have a significant impact on the deformation behavior of buildings. A pushover analysis allows you to analyze the deformation behavior of buildings and compare them with seismic actions. Using the Pushover Analysis add-on, you can analyze the seismic actions on a particular building, and thus assess whether the building can withstand the earthquake.

Price of First License
1,450.00 EUR

Time History Analysis for RSTAB 9

Dynamic Analysis

The Time History Analysis add-on performs dynamic structural analysis of external excitation. You can define various excitation functions in tables or as a function of time. The time history analysis is performed using the modal analysis or the linear implicit Newmark analysis.

Price of First License
1,450.00 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
1,450.00 EUR