ASTM-D3957 2009

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D3957-09 Standard Practices for Establishing Stress Grades for Structural Members Used in Log Buildings

Published By	Publication Date	Number of Pages
ASTM	2009	7

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Categories: 91.080.20 - Timber structures, ASTM

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Description

1.1 These practices cover the visual stress-grading principles applicable to structural wood members of nonrectangular shape, as typically used in log buildings. These practices are meant to supplement the ASTM standards listed in Section 2, which cover stress-grading of sawn lumber and round timbers. Pieces covered by these practices may also be used in building types other than log buildings.

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 to members used in log buildings. Detailed grading rules for commercial stress grades which serve as purchase specifications are established and published by agencies that formulate and maintain such rules and operate inspection facilities covering the various species.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 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.

NF Narrow Face WF Wide Face

FIG. 1 Typical Wall-Log Sections Showing Wide and Narrow Faces as Determined by Inscribed Rectangle

PDF Catalog

PDF Pages	PDF Title
1	Scope
2	Referenced Documents Significance and Use Stress-Grading of Wall-Logs FIG. 1
3	Stress-Grading of Sawn Round Timber Beams FIG. 2
4	FIG. 3
5	Example of Stress-Grade Development Keywords TABLE 1
6	X1. EQUATIONS FOR DETERMINING BENDING AND COMPRESSION-PARALLEL-TO-GRAIN DESIGN STRESS VALUES, FOR SAWN ROUND TIMBER BEAMS X1.1 X1.2 TABLE 2

Additional information

Standard Title	D3957-09 Standard Practices for Establishing Stress Grades for Structural Members Used in Log Buildings
Published Code	ASTM
Publication Date	2009
Pages Count	7
ICS Codes	91.080.20 - Timber structures

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ASTM-D3957 2009

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