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.

Keywords

Composite timber cross-sections Flexibility Gamma method Composite beam

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  • Updated 27 November 2020

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