I have a question regarding the RF-TENDON design tool. Is this tool still available, or has RFEM 6 replaced its functionality with the new Tendons add-on?
Can RFEM 6 fully model and design prestressing tendons, or is RF-TENDON still required for certain functions? If RF-TENDON is still available, could you please let me know how I can obtain or access it?
Thank you very much for your support.
Best regards,
Amir Armia
Hello @amirarmia, welcome to our Community 
Thank you for your interest in our Prestressed Concrete Solution. RF-TENDON from RFEM5 has been replaced in RFEM6 by a new add-on that is still under development but already offers some useful features. You can easily try RFEM6 and the new add-on by filling out the web form below.
The current solution in RFEM6 is a FEM-based solution featuring a new member type called “Tendon,” which is automatically connected to concrete master objects as long as they are within the physical volume. After prestressing these members with an equivalent axial strain, internal forces are generated in the concrete elements based on the reference axis of the tendon layout. These internal forces are divided into primary (P*e) and secondary (hyperstatic) forces and displayed in the program.
You can perform stress checks for Serviceability Limit States using the Stress-Strain Add-On to design the prestressing layout. Currently, prestress losses must be defined manually, and ULS design does not treat prestressing steel as structural reinforcement. We hope to implement these features in the near future.
https://www.dlubal.com/en/downloads-and-information/documents/online-manuals/tendons
I hope you find this information useful.