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Internal stresses in glulam due to moisture gradients in the grain direction

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Author

  • Johan Jönsson

Summary, in English

An experimental study on the internal stress state perpendicular to grain in glued laminated timber induced by moisture variations along the grain is presented. The stress is evaluated by using measured modulus of elasticity and strain. Different types of tests are performed, in which specimens are exposed to artificial climate change when the specimens are in either a wetting or a drying state, and specimens are exposed to a cyclic climate change. Test results from the specimens that were in a drying state show that the tensile stresses near the end of the specimens at some point exceeds the strength of the wood and cracks. In the opposite test, when the specimens are in a moistening phase, the maximum tensile stresses are lower and in the order of 0.2 MPa during the tested period. The cyclic test, which continued during 20 weeks, showed that there were no accumulated effects regarding strain and stress values. In this test, the average maximum tensile and compression stresses were of the order 0.20 and 0.10 MPa, respectively.

Publishing year

2005

Language

English

Pages

18-22

Publication/Series

Holzforschung

Volume

59

Issue

1

Document type

Journal article

Publisher

De Gruyter

Topic

  • Building Technologies

Keywords

  • crossgrain direction
  • contact free measuring technique
  • glulam
  • internal stress
  • released deformation
  • moisture gradients
  • KstrWood
  • technique
  • slicing

Status

Published

ISBN/ISSN/Other

  • ISSN: 1437-434X