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A contact free measurement method to determine internal stress states in glulam

På svenska

Author

  • Johan Jönsson
  • Staffan Svensson

Summary, in English

A method to determine the internal stress state across the grain of glued laminated wood (glulam), as well as the experimental equipment for measuring released deformation are described in this paper. The internal stress state is calculated from measured released deformations, which are measured by a contact free method based on a digital camera technique. Nondestructive measurement of the modulus of elasticity in the crossgrain direction is presented and the correlation between dynamic and static modulus of elasticity is shown. Results for a single specimen with induced moisture gradient show that the largest stress found in the tests was about 0.57 MPa, which is higher than the characteristic value of tensile strength perpendicular to the grain. This stress is based on released strain over the total length of the slices cut from the specimens. FEMsimulations evaluating the stress distribution within the specimen to account for end effects indicate that the maximum stress is about 30% higher.

Publishing year

2004

Language

English

Pages

148-153

Publication/Series

Holzforschung

Volume

58

Issue

2

Document type

Journal article

Publisher

De Gruyter

Topic

  • Building Technologies

Keywords

  • glulam
  • contact free measuring technique
  • released deformation
  • internal stress
  • modulus of elasticity
  • cross-grain direction
  • of measuring
  • accuracy
  • KstrWood

Status

Published

ISBN/ISSN/Other

  • ISSN: 1437-434X