Mechanical Properties and Specific Gravity of Randomly Sampled Subalpine Fir

The mechanical properties of subalpine fir were reevaluated on thirty-five 5-foot bolts collected from 35 randomly selected trees throughout the seven-state area of Utah, Colorado, Wyoming, Montana, Idaho, Washington, and Oregon. All mechanical properties measured, except compression perpendicular t...

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Bibliographic Details
Main Author: Bendtsen,B. A
Format: Report
Language:English
Subjects:
COLORADO
COMPRESSIVE PROPERTIES
DENSITY
FLEXURAL STRENGTH
IDAHO
LUMBER
MODULUS OF ELASTICITY
MONTANA
OREGON
RUPTURE
SPECIFIC GRAVITY
STRUCTURAL PROPERTIES
UTAH
WASHINGTON(STATE)
WOOD
Wood, Paper and Related Forestry Products
WYOMING
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Summary:The mechanical properties of subalpine fir were reevaluated on thirty-five 5-foot bolts collected from 35 randomly selected trees throughout the seven-state area of Utah, Colorado, Wyoming, Montana, Idaho, Washington, and Oregon. All mechanical properties measured, except compression perpendicular to grain stress at proportional limit, are significantly higher than property values currently used as the basis for allowable design stresses in lumber and plywood. Modulus of rupture was 10 percent higher than current values; modulus of elasticity in bending 22 percent; maximum crushing strength parallel to grain 12 percent; and shear 14 percent higher. Specific gravity was unchanged. (Modified author abstract)