ASTM D3737-09
(Practice)Standard Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)
Standard Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)
ABSTRACT
This practice details the standard procedures for establishing the allowable properties for structural glued laminated timber (glulam). Allowable properties include: stress indexes; stress modification factors associated with slope of grain; stresses for bending, tension and compression parallel to the grain; horizontal shear; compression perpendicular to the grain; radial tension and compression stresses in curved members; grade adjustment factors; modulus of elasticity; and modulus of rigidity. This practice is limited to the calculation of allowable properties subject to the given procedures for the selection and arrangement of grades of lumber of the species considered. It does not cover the requirements for production, inspection and certification, but in order to justify the allowable properties developed using procedures in this practice, manufacturers must conform to recognized manufacturing standards.
SCOPE
1.1 This practice covers the procedures for establishing allowable properties for structural glued laminated timber. Included are the allowable stresses for bending, tension and compression parallel to the grain, horizontal shear, compression perpendicular to the grain, and radial tension and compression in curved members. Also included are modulus of elasticity and modulus of rigidity.
1.2 This practice is limited to the calculation of allowable properties subject to the given procedures for the selection and arrangement of grades of lumber of the species considered.
1.3 Requirements for production, inspection and certification are not included, but in order to justify the allowable properties developed using procedures in this practice, manufacturers must conform to recognized manufacturing standards. Refer to ANSI/AITC A190.1 and CSA O122.
1.4 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.
1.5 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.
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Designation: D3737 – 09
Standard Practice for
Establishing Allowable Properties for Structural Glued
1
Laminated Timber (Glulam)
This standard is issued under the fixed designation D3737; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D245 Practice for Establishing Structural Grades and Re-
lated Allowable Properties for Visually Graded Lumber
1.1 This practice covers the procedures for establishing
D2395 Test Methods for Specific Gravity of Wood and
allowable properties for structural glued laminated timber.
Wood-Based Materials
Included are the allowable stresses for bending, tension and
D2555 Practice for Establishing Clear Wood Strength Val-
compression parallel to the grain, horizontal shear, compres-
ues
sion perpendicular to the grain, and radial tension and com-
D2915 Practice for Sampling and Data-Analysis for Struc-
pression in curved members. Also included are modulus of
tural Wood and Wood-Based Products
elasticity and modulus of rigidity.
D4761 Test Methods for Mechanical Properties of Lumber
1.2 This practice is limited to the calculation of allowable
and Wood-Base Structural Material
properties subject to the given procedures for the selection and
D5456 SpecificationforEvaluationofStructuralComposite
arrangement of grades of lumber of the species considered.
Lumber Products
1.3 Requirements for production, inspection and certifica-
D6570 Practice for Assigning Allowable Properties for
tion are not included, but in order to justify the allowable
Mechanically Graded Lumber
properties developed using procedures in this practice, manu-
E105 Practice for Probability Sampling of Materials
facturersmustconformtorecognizedmanufacturingstandards.
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2.2 AITC Standards:
Refer to ANSI/AITCA190.1 and CSAO122.
AITC117-71 Standard Specifications for Structural Glued
1.4 Thevaluesstatedininch-poundunitsaretoberegarded
Laminated Timber of Softwood Species, 1971
as standard. The values given in parentheses are mathematical
AITC117-74 Standard Specifications for Structural Glued
conversions to SI units that are provided for information only
Laminated Timber of Softwood Species, 1974
and are not considered standard.
AITC117-79 Standard Specifications for Structural Glued
1.5 This standard does not purport to address all of the
Laminated Timber of Softwood Species, 1979
safety concerns, if any, associated with its use. It is the
AITC“BrownBook” Determination of Design Values for
responsibility of the user of this standard to establish appro-
Structural Glued Laminated, 1979
priate safety and health practices and determine the applica-
AITCStandard407 Standard for Alternate Lumber Grades
bility of regulatory limitations prior to use.
for Use in Structural Glued Laminated Timber, 2005
2. Referenced Documents AITCStandard500 Determination of Design Values for
2
Structural Glued Laminated Timber in Accordance with
2.1 ASTM Standards:
ASTM D3737-89a, 1991
D9 Terminology Relating to Wood and Wood-Based Prod-
AITC Technical Note 21 Volume Factor for Structural
ucts
Glued Laminated Timber, 2005
D143 Test Methods for Small Clear Specimens of Timber
ANSI/AITCA190.1 Structural Glued Laminated Timber,
D198 Test Methods of Static Tests of Lumber in Structural
2007
Sizes
2.3 Other Standards:
ANSI/AF&PA National Design Specification for Wood
4
Construction
1
This practice is under the jurisdiction ofASTM Committee D07 on Wood and
5
CSAO122 Structural Glued Laminated Timber
is the direct responsibility of Subcommittee D07.02 on Lumber and Engineered
Wood Products.
Current edition approved Sept. 1, 2009. Published December 2009. Originally
3
approved in 1978. Last previous edition approved in 2008 as D3737–08. DOI: Available from theAmerican Institute ofTimber Construction, 7012 S. Revere
10.1520/D3737-09. Parkway, Suite 140, Centennial, CO 80112, https://www.aitc-glulam.org.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from American Forest and Paper Association (AF&PA), 1111 19th
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM St., NW, Suite 800, Washington, DC 20036, http://www.afandpa.org.
5
Standards volume information, refer to the standard’s Document Summary page on Available from Canadian Standards Association (CSA), 5060 Spectrum Way,
the ASTM website. Mississauga, ON L4W 5N6, Canada, http://www.csa.ca.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D3737 – 09
3. Terminology a knot) at the edge of the lumber to the cro
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This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately,ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D3737–08 Designation: D3737 – 09
Standard Practice for
Establishing Allowable Properties for Structural Glued
1
Laminated Timber (Glulam)
This standard is issued under the fixed designation D3737; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 Thispracticecoverstheproceduresforestablishingallowablepropertiesforstructuralgluedlaminatedtimber.Includedare
the allowable stresses for bending, tension and compression parallel to the grain, horizontal shear, compression perpendicular to
thegrain,andradialtensionandcompressionincurvedmembers.Alsoincludedaremodulusofelasticityandmodulusofrigidity.
1.2 This practice is limited to the calculation of allowable properties subject to the given procedures for the selection and
arrangement of grades of lumber of the species considered.
1.3 Requirements for production, inspection and certification are not included, but in order to justify the allowable properties
developed using procedures in this practice, manufacturers must conform to recognized manufacturing standards. Refer to
ANSI/AITCA190.1 and CSA 0122CSAO122.
1.4The values stated in inch-pound units are to be regarded as standard.
1.4 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.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D9 Terminology Relating to Wood and Wood-Based Products
D143 Test Methods for Small Clear Specimens of Timber
D198 Test Methods of Static Tests of Lumber in Structural Sizes
D245 Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber
D2395 Test Methods for Specific Gravity of Wood and Wood-Based Materials
D2555 Practice for Establishing Clear Wood Strength Values
D2915 Practice for Evaluating Allowable Properties for Grades of Structural Lumber
D4761 Test Methods for Mechanical Properties of Lumber and Wood-Base Structural Material
D5456 Specification for Evaluation of Structural Composite Lumber Products
D6570 Practice for Assigning Allowable Properties for Mechanically Graded Lumber
E105 Practice for Probability Sampling Of Materials
2.2 Other Standards:
3
ANSI/AITC A190.1Structural Glued Laminated TimberAITC Standards:
AITC117-71 Standard Specifications for Structural Glued Laminated Timber of Softwood Species, 1971
AITC117-74 Standard Specifications for Structural Glued Laminated Timber of Softwood Species, 1974
AITC117-79 Standard Specifications for Structural Glued Laminated Timber of Softwood Species, 1979
AITC“BrownBook” Determination of Design Values for Structural Glued Laminated, 1979
AITCStandard407 Standard for Alternate Lumber Grades for Use in Structural Glued Laminated Timber, 2005
1
This practice is under the jurisdiction of ASTM Committee D07 on Wood and is the direct responsibility of Subcommittee D07.02 on Lumber and Engineered Wood
Products.
Current edition approved April 15, 2008. Published June 2008. Originally approved in 1978. Last previous edition approved in 2007 as D3737–07. DOI:
10.1520/D3737-08.
Current edition approved Sept. 1, 2009. Published December 2009. Originally approved in 1978. Last previous edition approved in 2008 as D3737–08. DOI:
10.1520/D3737-09.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from the American Institute of Timber Construction, 7012 S. Revere Parkway, Suite 140, Centennial, CO 80112, https://www.aitc-glulam.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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D3737 – 09
AITCStandard500 Determination of Design Values for Structural Glued Laminated Timber in Accordance with ASTM
D3737-89a, 1991
AITCTechnicalNote21 Volume Factor fo
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