Research Article
Mar 1973
Efficient Fabrication of Glued-Laminated Timbers
Publication: Journal of the Structural Division
Volume 99, Issue 3
Abstract
Fifty-four large glued-laminated timber beams were designed, fabricated, and tested to failure in static bending. Designs included several levels of moduli of elasticity (MOE) and rupture (MOR). Beams were made from lumber of Southern pine, Douglas fir, hem-fir, and Lodgepole pine; they were 40 ft (12 m) long, 5 in. (13 mm) wide, and 24 in. (610 mm) deep. Individual pieces were evaluated by nondestructive testing (NDT) techniques for MOE before laminating. Results indicated several advantages for NDT methods in construction of glued-laminated beams. The lumber available can be located in the beam to gain maximum stiffness (MOE) and good strength (MOE). MOE of the beams was highly predictable; MOR was less predictable, but met the desired stress level. Based on the research, specifications have been published, which provide for the use of several additional species of lumber, nondestructively tested in glued-laminated beams.
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Information
Published In
Journal of the Structural Division
Volume 99 • Issue 3 • March 1973
Pages: 431 - 442
Copyright
© 1973 American Society of Civil Engineers.
History
Published in print: Mar 1973
Published online: Feb 1, 2021
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Authors
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James W. Johnson
Assoc. Prof., Forest Research Lab., School of Forestry, Oregon State Univ., Corvallis, Ore.
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