Accession Number : AD0701995

Title :   FLEXURAL PROPERTIES OF GLUED-LAMINATED SOUTHERN PINE BEAMS WITH LAMINATIONS POSITIONED BY VISUAL-STIFFNESS CRITERIA.

Descriptive Note : Forest Service research paper,

Corporate Author : FOREST PRODUCTS LAB MADISON WIS

Personal Author(s) : Moody,R. C. ; Bohannan,Billy

Report Date : FEB 1970

Pagination or Media Count : 22

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)

Descriptors :   (*WOOD, BEAMS(STRUCTURAL)), (*BEAMS(STRUCTURAL), FLEXURAL STRENGTH), (*LAMINATES, WOOD), MODULUS OF ELASTICITY, ADHESIVES, PLYWOOD, NONDESTRUCTIVE TESTING, SPECIFICATIONS, DEFLECTION, STRESSES, DENSITY, MOISTURE, STATISTICAL DATA

Subject Categories : Wood, Paper and Related Forestry Products
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE