Size effect of glulam beams in tension perpendicular to grain

Thomas Astrup, Christian Odin Clorius, Lars Damkilde, Preben Hoffmeyer

Research output: Contribution to journalJournal articleResearchpeer-review


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.
Original languageEnglish
JournalWood Science and Technology
Pages (from-to)361-372
Publication statusPublished - 2007

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