EXPERIMENTAL BEHAVIOUR OF TIMBER LATTICE BEAMS WITH SEMI-RIGID JOINTS: ANALYTICAL AND EXPERIMENTAL STUDY
COMPORTAMENTUL GRINZILOR CU ZĂBRELE DIN LEMN CU ÎMBINĂRI SEMI- RIGIDE: STUDIU TEORETIC ŞI
Résumé
The behaviour of standardized lattice timber beams in bending with semi-rigid joints is studied. Various measurement techniques are used in the experiments to measure the displacements and rotations of the glued and/or nailed joints. The experimental results, obtained on beams with different types of joints combining glue and nails, are presented. The description of the nails, the adhesives and the types of wood is detailed. The experimental results in terms of load-deflection curves, crack features, due to nails and adhesives, are presented. The semi-rigidity of the joint between vertical bracing and diagonal struts is analysed. The comparison of various measurements techniques showed the validity of the experimental results. These results showed the influence of the axial and the rotational semi-rigidity of the joints on the global behaviour of the beams. The experimental results are compared with the analytical results given by the Euler-Bernoulli beam theory, including or not the linear semi-rigid stiffness of the joints in tension or compression. The study shows the satisfactory behavior of the lattice beams and gives information on the opportunity to choose one of the gluing techniques to fulfill the mechanical requirements of the beams. The study also shows the necessity of a more complete modeling taking into account the effect of the rotation in the joint area and the influence of the nonlinearity on the global behaviour
of the beam.
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