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The paper describes an approach to model glue laminated timber (GLT) made of
pinewood (softwood), taking into account damage processes in timber and adhesive layers. An
example of a pre-cracked beam has been presented. Obtaining necessary material properties has
been supported by several finite elements models (FEM), laboratory tests and a wide literature
survey. The authors have taken into consideration an orthotropic material with damage for timber
lamellas and isotropic traction separation law for bonding layers. Both plane stress CPS8R and
COH2D4 finite elements from the Simulia ABAQUS system or mesh density, used in the numerical
analyses, have been carefully chosen and tested. The GLT beam model has been verified on the
basis of several values, using two types of testing techniques—MTS 809 machine measurements
and digital image correlation (DIC). Additional results revision has been provided by measuring a
crack shear displacement (CSD), using the original laboratory test setup by the authors’ idea.
Finally, some conclusions and introductory recommendations for modelling a glue laminated
timber in a plane stress have been formulated. The paper is a part of a wider research on
timber-polymer comp
