FLEXURAL PROPERTIES OF GLUED-LAMINATED SOUTHERN PINE BEAMS WITH LAMINATIONS POSITIONED BY VISUAL-STIFFNESS CRITERIA.
Abstract
To establish the effect of using modulus of elasticity in addition to visual grades as criteria for the positioning of laminations in glued-laminated beams, an experimental study on southern pine members was conducted. The beams were manufactured in accordance with current specifications for glued-laminated southern pine timber, except that (a) minimum-quality tension laminations meeting AITC 301-67 were used and (b) restrictions were placed on the modulus of elasticity of all laminations. The average modulus of elasticity of the beams manufactured using both visual and stiffness criteria was 12 percent higher than that for beams using only the visual criteria. This agreed with the theoretically expected increase in modulus of elasticity. The average modulus of rupture of the visual-stiffness beams was 14 percent higher than that for the visual-only beams. However, the minimum strength for each group was approximately equal. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1970
- Accession Number
- AD0701995
Entities
People
- Billy Bohannan
- R. C. Moody
Organizations
- Forest Products Laboratory