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Erschienen in: European Journal of Wood and Wood Products 5/2017

17.02.2017 | Original

Quasi-brittle fracture and size effect of glued laminated timber beams

verfasst von: Lukas Blank, Gerhard Fink, Robert Jockwer, Andrea Frangi

Erschienen in: European Journal of Wood and Wood Products | Ausgabe 5/2017

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Abstract

The load bearing capacity of glued laminated timber beams is size dependent. A material based size effect occurs due to the natural variability of the timber properties and can be explained with the Weibull weakest link theory. The Weibull type size effect has received much attention in the timber research community in the past as it is the dominating size effect regarding the load bearing capacity of timber beams. In this paper, it is shown that a further deterministic size effect, which originates from the timber fracture behavior, influences the load bearing capacity of glued laminated timber beams. It is the size effect associated with quasi-brittle behavior. The paper covers a short theoretical review on fracture related size effects and a study comparing experimentally tested beams of several sizes with detailed numerical simulations considering the natural growth characteristics of timber. Further, an analytical model illustrating the features of the fracture related size effect on the load bearing capacity of glued laminated timber beams is presented. It is demonstrated that the simulated load bearing capacity of the tested glued laminated timber beams distinctively improves if the quasi-brittleness is taken into account by using a softening constitutive law.

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Metadaten
Titel
Quasi-brittle fracture and size effect of glued laminated timber beams
verfasst von
Lukas Blank
Gerhard Fink
Robert Jockwer
Andrea Frangi
Publikationsdatum
17.02.2017
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Wood and Wood Products / Ausgabe 5/2017
Print ISSN: 0018-3768
Elektronische ISSN: 1436-736X
DOI
https://doi.org/10.1007/s00107-017-1156-0

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