- SIA 260 (load cases/load combinations)
- SIA 261 (loads)
- SIA 262 (reinforced concrete structures)
- SIA 263 (steel structures)
- SIA 265 (timber structures)
Swiss Standards (SIA)
SIA Standards
Implemented Swiss Standards
Automatic Generation of Combinations in RFEM and RSTAB
In RFEM 6 / RSTAB 9, load and result combinations are automatically created according to the Swiss standards SIA 260 and SIA 260 | Timber.
Timber Design According to SIA 265
The Timber Design add-on for RFEM 6 / RSTAB 9 performs all typical ultimate limit state, stability, serviceability limit state, and fire resistance design checks of timber members according to the Swiss standard SIA 265.
Seismic Design According to SIA 261
The Modal Analysis add-on for RFEM 6 / RSTAB 9 allows you to determine natural frequencies and mode shapes.
In the Response Spectrum Analysis add-on for RFEM 6 / RSTAB 9, the seismic analysis is performed using the multi-modal response spectrum analysis. Among others, the Swiss standard SIA 261 is implemented.
Design of Reinforced Concrete Members and Surfaces According to SIA 262
The module extension SIA 262 for RFEM 5 / RSTAB 8 extends various add-on modules for concrete design by the Swiss standard SIA 262.
Steel Design According to SIA 263
The RF-/STEEL SIA add-on module for RFEM 5 / RSTAB 8 performs the ultimate and serviceability limit state design of members and continuous members according to the Swiss standard SIA 263.
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Frequently Asked Questions (FAQ)Customer Projects
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Considering Elastic Slip Modulus of Timber Connection
For a timber connection as shown in Figure 01, you can take into account the torsional spring rigidity (spring stiffness for rotation) of the connections. You can determine it by means of the slip modulus of the fastener and the polar moment of inertia of the connection.

New
Timber Design | Strength and Stability | Cross-Section Resistance Features
- Design of tension, compression, bending, shear, torsion, and combined internal forces
- Consideration of a notch
- Support pressure design for the internal and external supports
- Design of curved and tapered members
- When performing the fire resistance design with TIMBER Pro, I get Error 10001. How can I fix the error?
- Is it also possible to reduce the shear force on a support or perform design with the shear force at a distance d to the support in RF‑CONCRETE Surfaces?
- When performing "manual definition of the reinforcement areas" in RF‑CONCRETE Surfaces, do I have to completely reinforce the entire structural component manually? Or does RF‑CONCRETE Surfaces apply the required reinforcement in the areas where I have not performed the manual definition?
- For design with CONCRETE NL, is the creep applied to the entire cross-section, or to the concrete compression zone only?
- How can I consider loads from the self-weight as "favorable" and "unfavorable" for the combinations?
- When I create a user-defined result value, the RFEM solver window opens briefly and the calculation is apparently performed again. Why? I have already performed the calculation before.
- For a specific combination expression, I would like to consider a load case with a combination coefficient that deviates from the standard. How can I proceed?
- Is the compression reinforcement calculated for the ultimate limit state design in RF‑CONCRETE Surfaces? Or is it only possible in RF‑CONCRETE Members?
- I design a combined structure made of timber materials with different creeping parameters. How can I perform the serviceability limit state design according to EN 1995‑1‑1?
- In the RF‑/DYNAM Pro - Equivalent Loads add-on module, it is possible to consider accidental torsional actions. Which calculation approach is behind the calculation? Which values have to be entered for the eccentricities eX and eY?
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