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Dipl.-Ing. (FH) Gerhard Rehm
2021-02-26

Considering the Joint Slip in Parametric Timber Cross-Sections

In timber design, beams are often built from several timber elements. The individual elements can be connected with 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 flexibility of the connection in the individual layers for composed timber sections. This is achieved by entering the reduction factor gamma determined using 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.

Considering Slip Joint in Parametric Timber Cross-Sections
Considering Slip Joint in Parametric Timber Cross-Sections

In addition, it is possible to assign different materials to the individual cross‑section. To do this, select the option "Hybrid", then select one of these materials as reference material to determine the ideal cross‑section properties.

Composite Timber Beams
Composite Timber Beams
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KB 000612 | Considering Joint Slip in Parametric Timber Cross-Sections
Author

Mr. Rehm is responsible for developing products for timber structures, and he provides technical support for customers.

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