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  1. Creep and Relaxation

    Definition of Stress Losses From Relaxation for Prestressed Concrete Design

    When designing prestressed concrete components, the time-dependent stress losses from creeping, shrinkage and relaxation have to be considered. The consideration of relaxation losses when designing prestressed concrete in RF-TENDON and RF-TENDON Design is discussed in detail in the following.
  2. Figure 01 - RFEM Model of Residential Building with Prestressed Concrete Ceiling

    Prestressed Concrete Design in RFEM

    Efficient design of prestressed structural components requires a few additional steps that go beyond the standard reinforced concrete design, from modelling tendons, to the calculation of equivalent loads, to the cross-section resistance design. Therefore, it is important that the software for prestressed concrete design is structured and the navigation is possible in the program. RFEM with two add-on modules RF-TENDON and RF-TENDON Design fulfils these requirements and allows engineers to carry out the complete design of prestressed beams, frames, plates, buildings and bridges according to EN 1992-1-1 with National Annexes and SIA 262.

  3. Simultaneously Editing Several Tendons in RF-TENDON

    Simultaneously Editing Several Tendons

    As of the program version RFEM 5.06, it is possible to edit several tendons in the RF‑TENDON add‑on module at the same time. For this, it is necessary to select the corresponding tendons in the table of tendon arrangement.

  4. Importing Tendon Geometry from DXF Template in RF-TENDON

    Importing Tendon Geometry from DXF Template

    In RF-TENDON, it is possible to import tendon geometry from a DXF file. Thus, you can basically use any tendon geometry.

  5. Simulating and Adjusting Equivalent Loads from RF-TENDON

    Simulating and Adjusting Equivalent Loads

    The equivalent loads determined in RF‑TENDON due to prestress are transferred in RFEM as member loads or as line loads. A member load is used for member types with their own stiffness, a line load is used for member types without their own stiffness.

  6. Code and Calculation Settings in RF-TENDON and RF-TENDON Design

    Code and Calculation Settings in RF-TENDON and RF-TENDON Design

    In RF‑TENDON and RF‑TENDON Design, you can review and adjust the code‑dependent factors, calculation parameters and calculation methods using the ‘Code’ button. You can display the setting and adjustment options according to a chapter of a code, selecting the ‘Grouping’ option in the dialog box.

  7. DXF Export in RF-TENDON

    DXF Export in RF-TENDON

    Once you have determined the final tendon geometry in RF‑TENDON, exporting the model to a CAD program can be useful. For this purpose, the module includes the option to export the file in the .dxf file format. You can select the export function by right-clicking the workspace. After selecting the DXF file format and a location, you can do some additional settings.

  8. Figure 01 - Calculating Prestressed Hollow Core Slabs with RFEM 5 and RF-TENDON (Design)

    Calculating Prestressed Hollow Core Slabs

    Precast prestressed hollow core slabs consist of composite, uniaxially stressed non‑solid slabs with a width of about 1.20 m. These elements are prestressed with pre-tension in a precast concrete plant. The precasting is usually done with slipformers. Due to the lesser self‑weight of the non‑solid slab and the existing prestress, these precast prestressed hollow core slabs show a lesser deflection than loosly reinforced slabs made of solid concrete.

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