Warping Torsion Analysis Software
Structural FEM Analysis and Design
As a basis of the modular program family, RFEM 6 is the structural analysis program of choice for many civil and structural engineers. The main program RFEM is used to define structures, materials, and loads for planar and spatial structural systems consisting of plates, walls, shells, and members. In case your project requires different elements and materials, that's no problem. Because RFEM 6 also allows you to create combined structures as well as to model solid and contact elements.
Structural Frame & Truss Analysis Software
Do you work with pure member structural models? Then RSTAB 9 is the right program for your daily work. The structural frame & truss analysis software RSTAB 9 has a similar range of functions as the FEA software RFEM, but is specialized in beam, frame, and truss structures. Therefore, the user interface is very clear and the program is very easy to use. It is not for nothing that for many years, RSTAB has been the best choice for structural analysis and design of pure structural member models.
Warping Torsion Second-Order Analysis with 7 Degrees of Freedom
If you're looking for a little more functionality, the Dlubal Software add-ons are here to help you. The Torsional Warping (7 DOF) add-on for RFEM 6 / RSTAB 9 allows you to consider the cross-section warping as an additional degree of freedom when calculating members in RFEM and RSTAB. This gives you even more options.
Interfaces for Data Exchange
It is well known that working together increases productivity. Exchanging ideas is always a good thing. To make it easier for you to work with others, the Dlubal structural analysis software can be seamlessly integrated into the Building Information Modeling (BIM) process. A wide range of interfaces allows you to exchange data from digital building models with RFEM or RSTAB.
Use the Webservice (a programmable interface) to read and write the required data from or to RFEM and RSTAB.
Support and Learning
No company can be successful without satisfied customers. Therefore, customer service is a fundamental pillar of the Dlubal Software company philosophy. We provide any necessary support you need to complete your daily work. Your Dlubal team is always here for you!
Contact Us
Do you have any questions about our products or which are best suited for your design projects? Contact us via phone, email, chat, or forum, or search the FAQ page, available 24/7.
Further Information
Online Manual | RFEM 6

Stability Analysis of Channel Sections
The RF‑/STEEL Warping Torsion module extension of the RF‑/STEEL EC3 add‑on module allows you to design members with asymmetric cross‑sections. The new option is fully integrated in the design module and can be activated for sets of members.
- What does the load application point in RF‑/STEEL EC3 Warping Torsion refer to?
- To which axes do the support rotations and support eccentricities in RF‑/STEEL EC3 Warping Torsion refer?
- My results of the calculation with Torsional Warping are implausible. What could be the reason?
- I am designing an eccentrically modeled wall beam in RF‑/STEEL Warping Torsion, which is loaded transversely with a distributed load. While the bending moments in the main program result in zero at the member start and member end due to the hinges, the RF‑/STEEL Warping Torsion add-on module displays moments at these locations, which incorrectly reduces the span moment.How do I get the boundary moments equal to zero at this point?
- When entering data in the RF‑/STEEL EC3 add-on module, I get the error message "Incorrect location of the intermediate lateral restraint". Why?
- How do you perform a lateral-torsional buckling analysis for asymmetric steel cross-sections?
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What are the options in RFEM or RSTAB for determining the ideal elastic critical moment for any cross-sections and systems/loads?
Is it also possible to design flat steel (brackets, flat steel stringers of staircases)? -
The load distribution on my members looks different when using the Load Transfer surface vs. the Load Wizards. What is the reason?
- I received an error message “Surface of incompatible type... (Surface in upper plane of building story must be of ‘Load transfer’ type)” when running the calculation. What is the reason?
- My beam has a continuous lateral support and therefore lateral torsional buckling (LTB) is not a concern. How do I define the effective length?
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