Abstract
The derivation is given of the combined bi-axial bending, compression and shear strength of timber beams. As for other materials the elastic-full plastic limit design approach applies, which is known to precisely explain and predict uniaxial bending strength behaviour. The derivation is based on choosing the location of the neutral line. This provides the stress distribution in the beam cross section in the ultimate state for that case, making it possible to calculate the associated ultimate bending moments in both main directions and ultimate normal- and shear force. The derived general equations are simplified to possible elementary design equations, applicable for building regulation.
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