Author: C. C. Gerhards
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 544
Book Description
Relationship of Tensile Strength of Southern Pine Dimension Lumber to Inherent Characteristics
Author: C. C. Gerhards
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 544
Book Description
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 544
Book Description
Relationship of Tensile Strength of Southern Pine Dimension Lumber to Inherent Characteristics
Author: C. C. Gerhards
Publisher:
ISBN:
Category :
Languages : en
Pages : 33
Book Description
Several relationships between tensile strength and some lumber characteristics that can be measured nondestructively are evaluated. From 72 to 83 percent of the variation in tensile strength of several hundred southern pine 2- by 4- and 2- by 8-inch specimens was accounted for by various linear combinations of strength ratio of knots, stiffness, slope of grain, and specific gravity. Strength ratio of knots and stiffness were the most significant variables. Evaluated in conjunction with other variables, stiffness measured over a 4-foot span improved the coefficient of determination of 2 by 4's by about 0.05 compared to stiffness measured over a 15-foot span; three methods to determine strength ratio of knots gave coefficients of determination that differed by a maximum of 0.08. A method for estimating lower 5 percent exclusion values for tensile strength is also presented. (Author).
Publisher:
ISBN:
Category :
Languages : en
Pages : 33
Book Description
Several relationships between tensile strength and some lumber characteristics that can be measured nondestructively are evaluated. From 72 to 83 percent of the variation in tensile strength of several hundred southern pine 2- by 4- and 2- by 8-inch specimens was accounted for by various linear combinations of strength ratio of knots, stiffness, slope of grain, and specific gravity. Strength ratio of knots and stiffness were the most significant variables. Evaluated in conjunction with other variables, stiffness measured over a 4-foot span improved the coefficient of determination of 2 by 4's by about 0.05 compared to stiffness measured over a 15-foot span; three methods to determine strength ratio of knots gave coefficients of determination that differed by a maximum of 0.08. A method for estimating lower 5 percent exclusion values for tensile strength is also presented. (Author).
Relationship of Tensile Strength of Southern Pine Dimension Lumber to Inherent Characterisics
Author: C. C. Gerhards
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
Book Description
Strength and Stiffness of Small Glued-laminated Beams with Different Qualities of Tension Laminations
Author: Catherine M. Marx
Publisher:
ISBN:
Category : Laminated wood
Languages : en
Pages : 52
Book Description
Publisher:
ISBN:
Category : Laminated wood
Languages : en
Pages : 52
Book Description
U.S.D.A. Forest Service Research Paper FPL.
Author:
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 390
Book Description
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 390
Book Description
Wood Anatomy of the Neotropical Sapotaceae
Author: Bohumil Francis Kukachka
Publisher:
ISBN:
Category : Wood
Languages : en
Pages : 672
Book Description
Publisher:
ISBN:
Category : Wood
Languages : en
Pages : 672
Book Description
Research Paper FPL
Author:
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 800
Book Description
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 800
Book Description
The Influence of Moisture Content on the Flexural Properties of Southern Pine Dimension Lumber
Author: T. E. McLain
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 48
Book Description
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 48
Book Description
Research Accomplishments
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 132
Book Description
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 132
Book Description
Formation and Properties of Juvenile Wood in Southern Pines
Author:
Publisher:
ISBN:
Category : Juvenile wood
Languages : en
Pages : 48
Book Description
To satisfy the increasing demand for forest products, much of the future timber supply will be from improved trees grown on managed plantations. This fast-grown resource will tend to be harvested in short age rotations and will contain higher proportions of juvenile wood than that of current harvests. In anticipation of this resource, definitive information is needed on the influence of juvenile wood on lumber properties so that grading rules and the associated allowable design stresses can be modified as needed. This document reports the results of an extensive review of the literature on juvenile wood in southern pines. This report defines and discusses the extent, occurrence, and characteristics of juvenile wood. It reviews the effects that environment and silviculture have on the amount of juvenile wood produced. Finally, the impacts that juvenile wood has on mechanical properties were quantified. The results of this quantification are significant to all producers of fast-grown plantations. Research has clearly shown that juvenile wood will have a detrimental impact on allowable design stresses for visually graded lumber. It is critical that methods are developed to more carefully manage fast-grown plantation wood for its most efficient use. This review should serve as an overall collection of knowledge pertaining to juvenile wood research in southern pines and should help in the decision-making efforts to improve seedling selection techniques and silvicultural practices to maximize the potential for fast-grown plantations of southern pines.
Publisher:
ISBN:
Category : Juvenile wood
Languages : en
Pages : 48
Book Description
To satisfy the increasing demand for forest products, much of the future timber supply will be from improved trees grown on managed plantations. This fast-grown resource will tend to be harvested in short age rotations and will contain higher proportions of juvenile wood than that of current harvests. In anticipation of this resource, definitive information is needed on the influence of juvenile wood on lumber properties so that grading rules and the associated allowable design stresses can be modified as needed. This document reports the results of an extensive review of the literature on juvenile wood in southern pines. This report defines and discusses the extent, occurrence, and characteristics of juvenile wood. It reviews the effects that environment and silviculture have on the amount of juvenile wood produced. Finally, the impacts that juvenile wood has on mechanical properties were quantified. The results of this quantification are significant to all producers of fast-grown plantations. Research has clearly shown that juvenile wood will have a detrimental impact on allowable design stresses for visually graded lumber. It is critical that methods are developed to more carefully manage fast-grown plantation wood for its most efficient use. This review should serve as an overall collection of knowledge pertaining to juvenile wood research in southern pines and should help in the decision-making efforts to improve seedling selection techniques and silvicultural practices to maximize the potential for fast-grown plantations of southern pines.