The study establishes the validity of transverse isotropy, in the plane normal to the longitudinal fibers, for southern pine beams; and shows that Saint Venant's isotropic torsion solution accurately predicts the linear torsional responses of southern pine glulam (glued-laminated) beams, and that it can be used to compute the shear moduli of glulam beams. The experimental torsion program presented in this paper outlines a detailed procedure that can be used to determine the shear moduli in the radial (G sub LR) and tangential (G sub LT) directions for orthotropic wood samples of various species. It is shown that solid-sawn and glulam southern pine beams can be modeled as transversely isotropic. This assumption permits computing the shear modulus of timber beams from torsion test and Saint-Venant's isotropic torsion solution. By establishihg the applicability of the assumption to other wood species, the design shear moduli data, which are not available for most species, can be obtained from torsion tests of full size samples and statistical analyses.

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  • Accession Number: 00608015
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 31 1991 12:00AM