Strength and Stiffness of Small Glued-Laminated Beams with Different Qualities of Tension Laminations.
Abstract
The objective of this research study was twofold: (a) to determine at what beam depth specially graded 302-24 (2) tension laminations are required to attain a 2,400 lb/sq. in. design stress; (b) to determine the appropriate design stress for specification-type beams with the regular laminating grades of L1 Douglas Fir-Larch (DF-L) or No. 1D Southern Pine (SP) as the tension laminations. The 302-24 grade of lumber required for tension laminations on 24F4 deep beams is a limited resource and is not as readily available as L1 or No. 1D lumber now used as the tension lamination on 24F shallow beams-thus necessitating objective (b). The 180 glued-laminated beams evaluated were of near-minimum quality; each selected tension lamination had a near-maximum-size, strength-reducing characteristics positioned in the most highly stressed region of the test beams. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1981
- Accession Number
- ADA106562
Entities
People
- Catherine M. Marx
- Russell C. Moody
Organizations
- Forest Products Laboratory