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Publication
Modeling the influence of delamination on the mechanical performance of straight glued laminated timber beams
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Advisor(s)
Abstract(s)
Delamination at the glue lines is a key factor to take into account when assessing glued laminated timber
members in service. In order to gain a more objective and wide knowledge about the importance of
delamination in relation to its type and extension, a numerical study was developed.
Finite element modeling (FEM) was used to evaluate the influence of delamination – near the surface,
on the vertical faces and ends – on the mechanic performance of straight glued laminated timber beams.
The FEM was validated by comparing stresses and deformations obtained with the model and with the
application of the beam theory, showing satisfactory results. Results show that when delamination is
non-symmetric regarding the member’s cross section, it can cause the member’s lateral instability, thus
increasing its stresses and deformations. Delamination is not a problem when it occurs in members or
member areas with low shear stresses, particularly when it is symmetric and does not reach the whole
width of the beam. The stresses corresponding to the bending or deformation limit-states get near the
elastic limit only for very important delamination. Moreover, delamination depth higher than 60% of
the cross section width may be regarded as a turn point beyond which the structural integrity may be
at risk.
Description
Keywords
Glued laminated timber Delamination Finite element models
Citation
Florindo Gaspar, Helena Cruz, Augusto Gomes, Modeling the influence of delamination on the mechanical performance of straight glued laminated timber beams, Construction and Building Materials, Volume 98, 2015, Pages 447-455, ISSN 0950-0618, https://doi.org/10.1016/j.conbuildmat.2015.08.011
Publisher
Elsevier