Norm

ASTM D245-06(2011)

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

61,51

Over deze norm

Status Definitief
Aantal pagina's 17
Commissie D07.02
Gepubliceerd op 01-10-2011
Taal Engels

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:

Section
Scope 1
Significance and Use3
Basic Principles of Strength Ratios4
Estimation and Limitation of Growth Characteristics5
Allowable Properties for Timber Design6
Modification of Allowable Properties for Design Use7
Example of Stress-Grade Development8

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

1.5 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.

Details

ICS-code 79.040
Nederlandse titel Standard Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber
Engelse titel Standard Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber

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