Considering the Joint Slip in Parametric Timber Cross-Sections
Tips & Tricks
In timber design, beams are often built up of several timber elements. The individual elements can be connected by glue, nails, bolts, or dowels. A glued connection is to be assumed as rigid. In the case of dowel‑type fasteners, the joint is compliant (slip joint) and the cross‑section properties of the connected elements cannot be fully applied.
In RFEM 5 and RSTAB 8, it is possible to consider the compliance of the connections of built‑up members in the individual layers. This is done by entering the reduction factor gamma, which can be determined by means of the “gamma method”, for example according to EN 1995‑1‑1 (Annex B) or DIN 1052:2008 (8.6.2). This factor takes into account a reduction of the parallel axis theorem components of the cross‑section parts from which an effective bending stiffness results.
In addition, it is possible to assign different materials to the individual cross‑section. To do this, select the option “Hybrid”, and then select one of these materials as reference material to determine the ideal cross‑section properties.
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Frequently Asked Questions (FAQ)
- I design timber components. The deformations of load combinations deviate from the manual calculation exactly by the factor of the material partial safety factor. Why?
- I would expect the results from my load combination (CO) set to a linear analysis to equal the summation of the results from my load cases (LC) also set to a linear analysis. Why do the results not match?
- Which Dlubal Software programs can I use to calculate and design timber structures?
- How can I set the deformation coefficient kdef in the program?
- A rigid member should only be able to absorb tensile forces or only compressive forces. What are the options for considering these nonlinearities in the calculation?
- How can I perform a stability analysis for a tapered member?
- After opening a duopitch roof beam from RX‑TIMBER in RFEM/RSTAB, it is displayed with a gap in the apex zone. Does this affect the calculation?
- How do I display the nodal displacements graphically?
- How does the activation of the precamber imperfection work?
- Can I consider a shear force reduction with the RF‑/TIMBER Pro add-on module?
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