Accession Number : AD0715991

Title :   Some Stress-Grading Criteria and Methods of Grade Selection for Dimension Lumber.

Descriptive Note : Forest Service research paper,

Corporate Author : FOREST PRODUCTS LAB MADISON WIS

Personal Author(s) : Ethington,R. L.

Report Date : DEC 1970

Pagination or Media Count : 17

Abstract : The paper demonstrates procedures for selecting machine grades of lumber based on experimental evidence of what can be produced, along with knowledge of required performance in use. It shows as an example that, for 2 by 8 southern pine floor joists, E-grades with a 1/3 edge-knot limitation are nearly ideal if the joists are used on a 24-inch spacing, or with a 1/2 edge-knot limitation if used on a 12-inch spacing. Relations of bending strength, tensile strength, and compressive strength to full-span modulus of elasticity and strength ratio are given. The methods described can be used for any species. (Author)

Descriptors :   (*WOOD, SELECTION), STANDARDS, BENDING, SHEAR STRESSES, MODULUS OF ELASTICITY, TENSILE PROPERTIES, DEFLECTION, REGRESSION ANALYSIS, BEAMS(STRUCTURAL), TABLES(DATA)

Subject Categories : Wood, Paper and Related Forestry Products

Distribution Statement : APPROVED FOR PUBLIC RELEASE