Is it possible to design built-up timber cross-sections?
Beams made up of several timber parts are often used in timber design. The individual parts can be connected by glue, nails, dowels, or dowel-type fasteners. If glue is used, the connection is to be assumed as rigid. For connections, for example, by dowel-type fasteners, the connection is compliant and the cross-section properties cannot be fully applied.
In RFEM and RSTAB, it is possible to consider the compliance (slip) of the connection in the individual layers. This can be done by specifying the coefficient of compliance gamma, which can be determined by means of the gamma method, for example according to EN 1995-1-1 (Annex B). By using this coefficient, the Steiner components of the cross-section parts are reduced, resulting in an effective bending stiffness.
In addition to this, you can assign different materials to the individual cross-sections. To do this, use the "Hybrid" function, in which one of these materials is used as reference for the determination of the ideal cross-section properties.