ASTM D3737-00a

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 3737 – 00a
Standard Practice for
Establishing Stresses for Structural Glued Laminated
1
Timber (Glulam)
This standard is issued under the fixed designation D 3737; 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 (e) indicates an editorial change since the last revision or reapproval.
2
1. Scope Grades of Structural Lumber
D 4761 Test Method for Mechanical Properties of Lumber
1.1 This practice covers the procedures for establishing
2
and Wood-Base Structural Material
allowable design stresses for structural glued laminated timber.
3
E 105 Practice for Probability Sampling of Materials
Properties considered include bending, tension and compres-
2.2 Other Standards:
sion parallel to the grain, modulus of elasticity, horizontal
4
ANSI/AITC A190.1 Structural Glued Laminated Timber
shear, and compression perpendicular to the grain.
5
CSA 0122 Structural Glued Laminated Timber
1.2 This practice is limited to the calculation of design
stresses for glulam subject to the given procedures for the
3. Terminology
selection and arrangement of grades of lumber of the species
3.1 Definitions:
considered.
3.1.1 E-rated lumber—lumber graded for laminating by
1.3 Requirements for production, inspection, and certifica-
nondestructive measurement for a modulus of elasticity (E) and
tion are not included, but in order to justify the design stresses
by visual inspection in accordance with the grading rules of the
developed using procedures in this practice, manufacturer must
applicable grading or inspection agency.
conform to recognized manufacturing standards for glulam.
3.1.2 glulam—a term used to denote structural glued lami-
Refer to ANSI/AITC A190.1 and CSA 0122.
nated timber, which is a material glued up from suitably
1.4 Stresses established by use of this practice are based on
selected and prepared pieces of wood either in a straight or
dry conditions of use (12 % average with less than 16 %
curved form with the grain of all pieces essentially parallel to
moisture content). Modifications for wet-use conditions are
the longitudinal axis of the member.
given in 9.2.
3.1.3 horizontally laminated timber—a glulam member de-
1.5 The values stated in inch-pound units are to be regarded
signed to resist bending loads applied perpendicularly to the
as standard.
wide faces of the laminations.
1.6 This standard does not purport to address all of the
3.1.4 lamination—a layer of lumber within the glued lami-
safety concerns, if any, associated with its use. It is the
nated timber.
responsibility of the user of this standard to establish appro-
3.1.5 modulus of elasticity (E)—for laminating, E is divided
priate safety and health practices and determine the applica-
into two categories to distinguish mode of measurement and
bility of regulatory limitations prior to use.
application.
2. Referenced Documents 3.1.6 long-span E—the E calculated from deflection mea-
sured in a flat-wise test of lumber with a center point loading
2.1 ASTM Standards:
and a span-depth ratio (1/d) of approximately 100.
D 198 Test Methods of Static Tests of Timber in Structural
2
3.1.7 member E—the design E of the finished glued lami-
Sizes
nated member as defined in this practice.
D 245 Practice for Establishing Structural Grades and Re-
2
3.1.8 vertically laminated timber—a glulam member de-
lated Allowable Properties for Visually Graded Lumber
signed to resist bending loads applied parallel to the wide faces
D 2395 Test Methods for Specific Gravity of Wood and
2
of the laminations.
Wood-Base Materials
3.1.9 visually graded lumber—lumber graded by visual
D 2555 Test Methods for Establishing Clear Wood Strength
2
inspection in accordance with the grading rules of the appli-
Values
cable grading or inspection agency.
D 2915 Practice for Evaluating Allowable Properties for
3.2 Symbols:
1
This practice is under the jurisdiction of ASTM Committee D7 on Wood and is
3
the direct responsibility of Subcommittee D07.02 on Lumber and Engineered Wood Annual Book of ASTM Standards, Vol 14.02.
4
Products. Available from the American Institute of Timber Construction, 11818 S.E. Mill
Current edition approved Sept. 10, 2000. Published November 2000. Originally Plain Blvd., Suite 415, Vancouver, WA 98684.
5
published as D 3737 – 78. Last previous edition D 3737 – 00. Available from the Canadian Standards Association, 178 Rexdale Blvd.,
2
Annual Book of ASTM Standards, Vol 04.10. Rexdale, Ontario, Canada, M9W 1R3.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D 3737
and suitably marked or segregated.
GDE = ratio of the cross-sec
...