Numerical Investigations of the Laminating Effect in Laminated Beams

Modeling the influence of delamination on the mechanical performance of straight glued laminated timber beams

“…This expression leads to the conclusion that the flexural strength decreases with increasing thickness of the lamella. The applicability of this expression was confirmed by Serrano and Larsen [7] that carried out simulations using 2D finite element to model an element with 1.60 m length subject to bending where a fissure was introduced in the outermost fiber subjected to tension. Furthermore, these authors concluded that with decreasing lamella thickness the governing failure mode changes from mode I to mode II approach, meaning that thinner lamellas (around 3 mm) tend to lead to shear failure whereas the failure for ticker lamellas (around 0.05 m) tends to be mixed.…”

“…For wood, energy is approximately between 200 and 400 J/m 2 for the failure mode I and reaches approximately three times this value for the failure mode II. To make a more accurate assessment, the value of energy corresponding to the mixed mode involving the two previous should be known [7]. The determination of failure energy of glued joints is difficult [8].…”

Modern structural wood products

“…Many studies on the performance of glulam members are available. Foschi & Barrett [6], Falk & Colling [7], and Serrano & Larsen [8] provide useful reviews on the subject.…”

Probabilistic approach for modelling the load-bearing capacity of glued laminated timber

“…Thus, the influence of single defects is reduced and local weak sections are reinforced by adjacent lamellas (for a detailed description see e.g. [14,46]). However, because of the relatively regular distance between knot clusters the joint appearance of knot clusters from different lamellas in the same cross section is quite frequent.…”