ASTM-D245 2006

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D245-06 Standard Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber

Published By	Publication Date	Number of Pages
ASTM	2006	16

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Description

1.1 This practice (1,2) covers the basic principles for establishing related unit stresses and stiffness values for design with visually-graded solid sawn structural lumber. This practice starts with property values from clear wood specimens and includes necessary procedures for the formulation of structural grades of any desired strength ratio.

1.2 The grading provisions used as illustrations herein are not intended to establish grades for purchase, but rather to show how stress-grading principles are applied. Detailed grading rules for commercial stress grades which serve as purchase specifications are established and published by agencies which formulate and maintain such rules and operate inspection facilities covering the various species.

1.3 The material covered in this practice appears in the following order:

1.4 The values given in parentheses are provided for information purposes only.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Significance and Use
2	Basic Principles of Strength Ratios
3	Estimation and Limitation of Growth Characteristics TABLE 1
4	TABLE 2
5	TABLE 3
6	TABLE 4
7	TABLE 5 TABLE 6 FIG. 1 FIG. 2
8	FIG. 3 FIG. 4 FIG. 5
10	TABLE 7
11	Allowable Properties for Timber Design TABLE 8
12	Modification of Allowable Properties for Design Use TABLE 9 TABLE 10
13	FIG. 6
14	Example of Stress-Grade Development
15	Keywords X1. FORMULAS FOR DETERMINING STRENGTH RATIOS CORRESPONDING TO VARIOUS KNOT SIZES AND WIDTH OF FACE FOR BEAMS AND STRINGERS, DIMENSION LUMBER AND POSTS AND TIMBERS X1.1 Formulas for Strength Ratios Corresponding to Various Combinations of Size of Knot and Width of Narrow Face X1.2 Formulas for Strength Ratios Corresponding to Various Combinations of Size of Knot and Width of Wide Face TABLE 11 TABLE 12
16	X1.3 Formulas for Strength Ratios Corresponding to Various Combinations of Size of Knot and Width of Wide Face REFERENCES

Additional information

Standard Title	D245-06 Standard Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber
Published Code	ASTM
Publication Date	2006
Pages Count	16

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ASTM-D245 2006

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