To open an RX‑TIMBER file in RFEM 5 or RSTAB 8, select the "All Files (*.*)" option as "File Type."
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Knowledge Base
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General
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Using the Timber Design add-on, timber column design is possible according to the 2018 NDS standard ASD method. Accurately calculating timber member compressive capacity and adjustment factors is important for safety considerations and design. The following article will verify the maximum critical buckling strength calculated by the Timber Design add-on using step-by-step analytical equations as per the NDS 2018 standard including the compressive adjustment factors, adjusted compressive design value, and final design ratio.
In this article, the adequacy of a 2x4 dimension lumber subject to combined biaxial bending and axial compression is verified using the RF-/TIMBER AWC add-on module. The beam-column properties and loading are based on example E1.8 of AWC Structural Wood Design Examples 2015/2018.
In RFEM 5 as well as RSTAB 8 in RF-/FOUNDATION Pro, you can save the foundation dimensions for all five foundation types as foundation templates in a user-defined database and use them later in other models.
In RF-/FOUNDATION Pro, the foundation design requires the definition of the corresponding loading (load cases, load combinations, or result combinations) for different design situations (STR, GEO, UPL, or EQU).
You can define built-up timber cross-sections, for example, channel, T, I, and box girders. Single elements are connected by rigid or semi‑rigid connections. Furthermore, hybrid cross-sections are available. In this case, a submenu provides an option to assign different materials to the individual cross‑section parts.
In RFEM, the oriented strand board (OSB) material is available for the USA and Canada. The material parameters are taken from the "Panel Design Specification manual".
Using the "Beam Panel" thickness type, you can model timber panel elements in 3D space. You just specify the surface geometry and the timber panel elements are generated using an internal member-surface construct, including the simulation of the connection flexibility.
A "beam panel" provides you with the following advantages:
- Single-sided and double-sided sheathing is possible
- Automatic calculation of a semi-rigid coupling
- Boarded sheathing
- Stapled sheathing
- User-defined sheathing
- Representation as a complete geometric 3D object (frame, crosstie, column, sheeting, staples), including eccentricity
- Considering openings via surface cells
- Design of the structural elements utilizing the Timber Design add-on
- Independent of material (for example, drywall with cold-formed sections and gypsum fibreboards as the sheathing)
You have the option to perform the fire resistance design of surfaces using the reduced cross-section method. The reduction is applied over the surface thickness. It is possible to perform the design checks for all timber materials allowed for the design.
For cross-laminated timber, depending on the type of adhesive, you can select whether it is possible for individual carbonized layer parts to fall off, and whether you can expect increased charring in certain layer areas.
How does the "Orthotropic Plastic" material model work in RFEM?
What is the meaning of the superposition according to the CQC rule in a dynamic analysis??
How can I display the internal forces in the global coordinate system and not in the principal coordinate system of the cross-section?
Can I use RFEM to calculate a log house three-dimensionally?
How do I display some results of all load cases in the printout report, but other results of selected load cases only?
I would like to carry out the flexural buckling design for timber components with imperfections and internal forces according to the second-order analysis. Is it sufficient to activate this in Details of the RF‑/TIMBER Pro add-on module or is it necessary to make additional settings?
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