Research Article
Mar 1976
Tension Proof Loading for Southern Pine Beams
Authors: Melvin Dee Strickler and Roy F. PellerinAuthor Affiliations
Publication: Journal of the Structural Division
Volume 102, Issue 3
Abstract
E–rating (measuring modulus of elasticity) and tension proof loading of lumber before laminating could improve stiffness characteristics and allowable design stresses for glued–laminated timber beams. Twenty–four large southern pine beams were fabricated from E–rated lumber–the high–E material located on the outside and low–E material in the core. Although average beam strength of southern pine equals Douglas fir, southern pine responds differently to tension proof loading than does Douglas fir. Southern pine may require higher proof loads (1.5 × beam Fb) than Douglas fir (1.3 × Fb) to eliminate brash pith–associated wood from the critical tension laminations. Since proof load breakage with southern pine was significantly less than with Douglas fir, a higher proof load stress for southern pine could be tolerated without causing excessive loss from breakage. Static beam modulus of elasticity is predictable from the E of the laminations with a correlation coefficient of 0.982.
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Published In
Journal of the Structural Division
Volume 102 • Issue 3 • March 1976
Pages: 645 - 657
Copyright
© 1976 American Society of Civil Engineers.
History
Published in print: Mar 1976
Published online: Feb 1, 2021
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Authors
Affiliations
Melvin Dee Strickler
Wood Technologist., Dept. of Materials Science and Engrg., Washington State Univ., Pullman, Wash
Roy F. Pellerin
Wood Technologist., Dept. of Materials Science and Engrg., Washington State Univ., Pullman, Wash
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