ASTM D3737-12
(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 slop 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 − 12
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 D198Test Methods of Static Tests of Lumber in Structural
Sizes
1.1 This practice covers the procedures for establishing
D245Practice for Establishing Structural Grades and Re-
allowable properties for structural glued laminated timber.
lated Allowable Properties for Visually Graded Lumber
Included are the allowable stresses for bending, tension and
D2395TestMethodsforDensityandSpecificGravity(Rela-
compression parallel to the grain, horizontal shear, compres-
tive Density) of Wood and Wood-Based Materials
sion perpendicular to the grain, and radial tension and com-
D2555PracticeforEstablishingClearWoodStrengthValues
pression in curved members. Also included are modulus of
D2915Practice for Sampling and Data-Analysis for Struc-
elasticity and modulus of rigidity.
tural Wood and Wood-Based Products
1.2 This practice is limited to the calculation of allowable
D4761Test Methods for Mechanical Properties of Lumber
propertiessubjecttothegivenproceduresfortheselectionand
and Wood-Base Structural Material
arrangement of grades of lumber of the species considered.
D5456Specification for Evaluation of Structural Composite
1.3 Requirements for production, inspection and certifica- Lumber Products
D6570Practice forAssigningAllowable Properties for Me-
tion are not included, but in order to justify the allowable
properties developed using procedures in this practice, manu- chanically Graded Lumber
E105Practice for Probability Sampling of Materials
facturersmustconformtorecognizedmanufacturingstandards.
3
Refer to ANSI/AITCA190.1 and CSAO122.
2.2 AITC Standards:
ANSI/AITCA190.1Structural Glued Laminated Timber,
1.4 Thevaluesstatedininch-poundunitsaretoberegarded
2007
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only 2.3 Other Standards:
and are not considered standard.
ANSI/AF&PA National Design Specification for Wood
4
Construction
1.5 This standard does not purport to address all of the
5
CSAO122 Structural Glued Laminated Timber
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3. Terminology
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
3.1 Definitions:
3.1.1 alternative lumber—laminated veneer lumber (LVL),
2. Referenced Documents
laminated strand lumber (LSL), oriented strand lumber (OSL),
2
or parallel strand lumber (PSL) meeting the requirements of
2.1 ASTM Standards:
Specification D5456; or solid-sawn lumber that is produced
D9Terminology Relating to Wood and Wood-Based Prod-
according to Practice D6570 and the grading rules of the
ucts
applicable grading or inspection agency.
D143Test Methods for Small Clear Specimens of Timber
3.1.2 E-rated lumber—lumber graded for use in manufac-
turing structural glued laminated timber by nondestructive
1
This practice is under the jurisdiction ofASTM Committee D07 on Wood and
measurement of a modulus of elasticity (E) and by visual
is the direct responsibility of Subcommittee D07.02 on Lumber and Engineered
Wood Products.
Current edition approved Nov. 1, 2012. Published December 2012. Originally
3
approved in 1978. Last previous edition approved in 2009 as D3737–09E01. DOI: Available from theAmerican Institute ofTimber Construction, 7012 S. Revere
10.1520/D3737-12. 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 − 12
inspection in accordance with the grading rules of the appli- a knot located away from the edge are in the same cross-
cable grading or inspection agency. section, the combination of the two shall be used in d
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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.
´1
Designation: D3737 − 09 D3737 − 12
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. A number in parentheses indicates the year of last reapproval. A
superscript epsilon («) indicates an editorial change since the last revision or reapproval.
1
εNOTE—Appendix X2 was editorially changed in April 2012.
1. 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.
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 Sampling and Data-Analysis for Structural Wood and Wood-Based Products
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
3
2.2 AITC Standards:
AITC 117-71 Standard Specifications for Structural Glued Laminated Timber of Softwood Species, 1971
AITC 117-74 Standard Specifications for Structural Glued Laminated Timber of Softwood Species, 1974
AITC 117-79 Standard Specifications for Structural Glued Laminated Timber of Softwood Species, 1979
AITC “Brown Book” Determination of Design Values for Structural Glued Laminated, 1979
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 Sept. 1, 2009Nov. 1, 2012. Published December 2009December 2012. Originally approved in 1978. Last previous edition approved in 20082009
as D3737 – 08.D3737 – 09E01. DOI: 10.1520/D3737-09E01.10.1520/D3737-12.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 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 − 12
AITC Standard 407 Standard for Alternate Lumber Grades for Use in Structural Glued Laminated Timber, 2005
AITC Standard 500 Determination of Design Values for Structural Glued Laminated Timber in Accordance with ASTM
D3737-89a, 1991
AITC Technical Note 21 Volume Factor for Structural Glued Laminated Timber, 2005
ANSI/AITC A190.1 Structural Glued Laminated Timber, 2007
2.3 Other Standards:
...
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