Evolution of Standardized Procedures for Adjusting Lumber Properties for Change in Moisture ContentU.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2001 - 50 pagina's This paper documents the development of procedures in American Society for Testing and Materials standards for adjusting the allowable properties of lumber for changes in moisture content. The paper discusses the historical context of efforts to establish allowable properties on a consensus basis, beginning in the 19th century. Where possible, the reasons for proposed changes in the standards are presented. The goal of this work is to foster a better understanding of how current standards have evolved and to promote reconciliation of conflicting property assignment procedures between current standards. |
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2-in.-thick lumber adjustment factors Appendix ASTM bending strength Berg Bridge and Trestle changes in moisture Circular 295 Committee compression perpendicular compressive stress continuously dry Department of Agriculture dimension lumber Douglas Fir dry lumber dry-green ratio effect of moisture engineering Equation establishing structural grades extreme fiber Forest Products Laboratory Forest Service green and dry green lumber joist and plank justment lb/in² Madison maximum moisture content mechanical properties methods for establishing Misc modulus of elasticity modulus of rupture moisture content adjustment moisture content M₁ Newlin and Johnson P₁ P₂ parallel to grain perpendicular to grain Pondosa properties for visually quadratic surface model seasoning Select S2 shear strength shear stress Sitka Sitka spruce small clear specimens Southern Pine spruce strength ratio structural timbers tensile strength tensile stress tests of full-size thick Tiemann timber testing tion Trestle Timbers U.S. Department visually graded lumber western hemlock