Size effect of glulam beams in tension perpendicular to grain

The strength of wood is reduced when the stressed volume is increased. The phenomenon is termed size effect and is often explained as being stochastic in the sense that the probability of weak locations occurring in the wood increases with increased volume. This paper presents the hypothesis that th...

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Bibliographic Details
Published in:Wood science and technology 2007-04, Vol.41 (4), p.361-372
Main Authors: Astrup, T, Clorius, C. O, Damkilde, L, Hoffmeyer, P
Format: Article
Language:English
Subjects:
Glulam
Hypotheses
Size effects
Stochasticity
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Summary:The strength of wood is reduced when the stressed volume is increased. The phenomenon is termed size effect and is often explained as being stochastic in the sense that the probability of weak locations occurring in the wood increases with increased volume. This paper presents the hypothesis that the lower strength is caused by stress concentrations. The stress concentrations arise from the anisotropic structure of wood, and are therefore deterministic. The hypothesis is substantiated through extensive FEM-calculations and experiments. A reasonable agreement between ultimate stresses determined experimentally and in FEM-computations was found.
ISSN:0043-7719
1432-5225
DOI:10.1007/s00226-006-0113-6