ASTM D3737-03

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Designation: D 3737 – 03
Standard Practice for
Establishing Allowable Properties for Structural Glued
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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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope D2915 Practice for Evaluating Allowable Properties for
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Grades of Structural Lumber
1.1 This practice covers the procedures for establishing
D4761 Test Methods for Mechanical Properties of Lumber
allowable properties for structural glued laminated timber.
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and Wood-Base Structural Material
Properties considered include bending, tension and compres-
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E105 Practice for Probability Sampling of Materials
sion parallel to the grain, modulus of elasticity, horizontal
2.2 Other Standards:
shear, compression perpendicular to the grain and radial
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ANSI/AITC AI90.1 - Structural Glued Laminated Timber
stresses in curved members.
ANSI/AF&PA - National Design Specification for Wood
1.2 This practice is limited to the calculation of allowable
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Construction
properties subject to the given procedures for the selection and
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CSA 0122 - Structural Glued Laminated Timber
arrangement of grades of lumber of the species considered.
1.3 Requirements for production, inspection and certifica-
3. Terminology
tion are not included, but in order to justify the allowable
3.1 Definitions:
properties developed using procedures in this practice, manu-
3.1.1 E-rated lumber—lumber graded for use in manufac-
facturersmustconformtorecognizedmanufacturingstandards.
turing glued laminated timber by nondestructive measurement
Refer to ANSI/AITC AI90.1 and CSA 0122.
of a modulus of elasticity (E) and by visual inspection in
1.4 Allowable properties established by use of this practice
accordance with the grading rules of the applicable grading or
are based on dry conditions of use (less than 16% moisture
inspection agency.
content).Modificationsforwet-useconditionsaregivenin9.2.
3.1.2 glulam—atermusedtodenotegluedlaminatedtimber
1.5 Thevaluesstatedininch-poundunitsaretoberegarded
which is a product made from suitably selected and prepared
as standard.
pieces of wood bonded together with an adhesive either in a
1.6 This standard does not purport to address all of the
straight or curved form with the grain of all pieces essentially
safety concerns, if any, associated with its use. It is the
parallel to the longitudinal axis of the member.
responsibility of the user of this standard to establish appro-
3.1.3 horizontally laminated timber—amemberdesignedto
priate safety and health practices and determine the applica-
resist bending loads applied perpendicularly to the wide faces
bility of regulatory limitations prior to use.
of the laminations (referred to as the x-x axis).
2. Referenced Documents 3.1.4 lamination—a layer of lumber within the glued lami-
nated timber.
2.1 ASTM Standards:
3.1.5 modulus of elasticity (E)—for laminating, E is desig-
D198 TestMethodsofStaticTestsofLumbersinStructural
2 nated in two categories to distinguish mode of measurement
Sizes
and application.
D245 Practice for Establishing Structural Grades and Re-
2
3.1.5.1 Long-Span E (LSE)—the E calculated from deflec-
lated Allowable Properties for Visually Graded Lumber
tion measured in a flat-wise static bending test of lumber with
D2395 Test Methods for Specific Gravity of Wood and
2
a center point loading and a span depth ratio (l/d) of approxi-
Wood-Base Materials
mately 100 or the E Test Methods D2555 and multiplying by
D2555 Test Methods for Establishing ClearWood Strength
2
the appropriate factors from Table 1.
Values
1 3
This practice is under the jurisdiction ofASTM Committee D07 on Wood and Annual Book of ASTM Standards, Vol 14.02.
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is the direct responsibility of Subcommittee D07.02 on Lumber and Engineered AvailablefromtheAmericanInstituteofTimberConstruction,11818S.E.Mill
Wood Products. Plain Blvd., Suite 415, Vancouver, WA 98684.
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Current edition approved July 10, 2003. Published September 2003. Originally Available from the American Forest and Paper Association, Washington, D.C.
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approved in 1978. Last previous edition approved in 2002 as D3737–02. Available from the Canadian Standards Association, 178 Rexdale Blvd.,
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Annual Book of ASTM Standards, Vol 04.10. Rexdale, Ontario, Canada, M9W 1R3.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D3737–03
TABLE 1 Adjustment Factors for Clear Wood Stresses
located away from the edge are in the same cross-section, the
(Test Methods D 2555)
comb
...