Timber Design for RFEM 6 / RSTAB 9

Product Description

  • Timber structures

Strength and Stability

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The Timber Design add-on allows for cross-section resistance design and stability analysis of timber member structures in the ultimate limit state. The input and result evaluation are completely integrated in the user interface of the structural FEA software RFEM and the frame & truss analysis software RSTAB.



  • A wide range of cross-sections, such as rectangular sections, square sections, T‑sections, circular sections, built-up cross-sections, irregular parametric cross-sections, and many others (suitability for design depends on the selected standard)
  • Design of tapered and curved members (design method according to the standard)
  • Adjustment of the essential design factors and standard parameters is possible
  • Flexibility due to detailed setting options for basis and extent of calculations
  • Fast and clear results output for an immediate overview of the result distribution after the design
  • Detailed output of the design results and essential formulas (comprehensible and verifiable result path)
  • Numerical results clearly arranged in tables and a graphical display of results in the model
  • Integration of the output into the RFEM/RSTAB printout report

Cross-Section Resistance Features

  • Design of tension, compression, bending, shear, torsion, and combined internal forces
  • Consideration of a notch
  • Support pressure design for internal and external supports
  • Design of curved and tapered members
  • Consideration of higher strengths for similar components that are close together (factor ksys according to EN 1995‑1‑1, 6.6(1)-(3))

Stability Analysis Features

  • Stability analyses for flexural buckling, torsional buckling, and flexural-torsional buckling under compression
  • Graphical input and check of the defined nodal supports and effective lengths for a stability analysis
  • Determination of the equivalent member lengths for tapered members
  • Consideration of the lateral-torsional bracing position
  • Lateral-torsional buckling analysis of the structural components subjected to moment loading
    • Depending on the standard, a choice between user-defined input of Mcr, analytical method from the standard, and use of internal eigenvalue solver
    • Consideration of a shear panel and a rotational restraint when using the eigenvalue solver
    • Graphical display of a mode shape if the eigenvalue solver was used
  • Stability analysis of structural components with the combined compression and bending stress, depending on the design standard
  • Comprehensible calculation of all necessary coefficients, such as the factors for considering moment distribution or interaction factors
  • Alternative consideration of all effects for the stability analysis when determining internal forces in RFEM/RSTAB (second-order analysis, imperfections, stiffness reduction, possibly in combination with the Torsional Warping (7 DOF) add-on)


The structural system is entered and the internal forces are calculated in the programs RFEM and RSTAB. The program provides access to the extensive material and cross-section libraries.

Timber Design is completely integrated into the main programs and automatically takes into account the structure and the available calculation results. Further entries for the timber design, such as effective lengths, cross-section reductions, or design parameters, are assigned to the objects to be designed. It is possible to select the elements graphically using the [Select] function.



After the design, the performed design checks are displayed in a table. All result details can be displayed and retraced using the clearly arranged design formulas.

The design checks are carried out at all governing locations of the members and displayed graphically as a result diagram. Furthermore, detailed graphics, such as the stress distribution on a cross-section or the governing mode shape, are available in the result output.

All input and result data are part of the RFEM/RSTAB printout report. You can customize the report's content and the desired output detail for the individual designs.


Timber Design

  • Support pressure design
  • Consideration of notches
  • Design of special shapes, such as curved and tapered members, including stability
  • Optional stability design using an eigenvalue analysis fully integrated into the design checks (Mcr calculation)
  • Consideration of system strength via ksys
  • Traceability of all design checks in clear formulas
  • Possibility to define buckling restraints and lateral-torsional bracing differently for fire resistance design and for a reversed moment distribution, for example, for downwind
  • Optional combination with the Warping Torsion (7 DOF) add-on

Manual of Timber Design for RFEM 6



1,850.00 EUR

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

Online Training | English

RFEM 6 | Students | Introduction to Timber Design

Online Training 11/25/2022 4:00 PM - 5:00 PM CET

Online Training | English

Eurocode 5 | Timber Structures According to DIN EN 1995-1-1

Online Training 12/08/2022 9:00 AM - 1:00 PM CET

Event Invitation

International Mass Timber Conference

Conference 03/27/2023 - 03/29/2023

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

Special Solutions

First, 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. Second, 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
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
1,250.00 EUR