ISSN: 0090-3973
Page Count: 6

Mechanical Properties of Laminated Veneer Lumber via Five-Point Bending Test
Bradtmueller, JP
Project engineer, Tres Joist MacMillan, KY

Hunt, MO
Professor and director, and former student assistant, Wood Research Laboratory, Purdue University, IN

Shook, SM

Abstract

The five-point bending test is shown to be an effective and efficient way of determining the mechanical properties of structural composite lumber. Shear strength, bending strength, shear-free Young's modulus of elasticity and shear modulus for both plank (flatwise) and joist (edgewise) orientations can be obtained with simple adjustments of the test configuration. Span or span-to-depth ratios are adjusted to produce either predominantly shear or bending failure. To determine elastic constants, a removable center support creates the necessary situation for both four-point bending and five-point bending. Use of a deflection yoke is especially important in determining the shear moduli. Results are reported for testing laminated veneer lumber. which was selected as representative of the evolving family of structural composite lumber products.

Keywords:
bending modulus, shear modulus, edgewise shear strength, five-point bending, laminated veneer lumber, structural composite lumber

Paper ID: JTE11983J
DOI: 10.1520/JTE11983J
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