Composite Timber Beams
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Description
In RFEM 5 and RSTAB 8, it is possible to consider the flexibility of the connections at composed timber sections in the individual layers. 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 is demonstrated by applying this model.
Model Used in
Keywords
Composite timber cross-sections Flexibility Gamma method Composite beam
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Considering the Joint Slip in Parametric Timber Cross-Sections
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.![Structural system and cross -section dimensions according to [1]](/-/media/Images/website/img/000001-010000/009101-009200/009153.png?la=en&mlid=2EB9D46A596E46D7BC98C084D747D2BC&hash=4620909E3F21B7A63E22C3171A0B47CCB161096F)
The cross-section resistance design analyzes tension and compression along the grain, bending, bending and tension/compression as well as the strength in shear due to shear force.
The design of structural components at risk of buckling or lateral-torsional buckling is performed according to the Equivalent Member Method and considers the systematic axial compression, bending with and without compressive force as well as bending and tension. Deflection of inner spans and cantilevers is compared to the maximal allowable deflection.
Separate design cases allow for a flexible and stability analysis of members, sets of members, and loads.
Design-relevant parameters such as the stability analysis type, member slendernesses, and limit deflections can be freely adjusted.
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