ASTM D7199-07(2012)
(Practice)Standard Practice for Establishing Characteristic Values for Reinforced Glued Laminated Timber (Glulam) Beams Using Mechanics-Based Models
Standard Practice for Establishing Characteristic Values for Reinforced Glued Laminated Timber (Glulam) Beams Using Mechanics-Based Models
ABSTRACT
This practice covers mechanics-based models for calculating characteristic values for the strength and stiffness of reinforced structural glued laminated timbers (glulam). The mechanics-based analyses shall account for the following: (1) stress-strain relationships for wood laminations and reinforcement; (2) strain compatibility; (3) equilibrium; (4) variability of mechanical properties; (5) volume effects; (6) finger-joint effects; (7) laminating effects; and (8) stress concentrations at the termination of reinforcement in beams with partial length reinforcement. This practice also provides for minimum physical test requirements to validate mechanics-based models. A minimum set of performance-based durability test requirements for reinforced glulams is also herein described. Additional durability test requirements shall be considered in accordance with the specific end-use environment.
SCOPE
1.1 This practice covers mechanics-based requirements for calculating characteristic values for the strength and stiffness of reinforced structural glued laminated timbers (glulam) manufactured in accordance with applicable provisions of ANSI/AITC A190.1, subjected to quasi-static loadings. It addresses methods to obtain bending properties parallel to grain, about the x-x axis (Fbx and Ex) for horizontally-laminated reinforced glulam beams. Secondary properties such as bending about the y-y axis (Fby), shear parallel to grain (F vx and Fvy), tension parallel to grain (Ft), compression parallel to grain (Fc), and compression perpendicular to grain (Fc⊥) are beyond the scope of this practice. When determination of secondary properties is deemed necessary, testing according to other applicable methods, such as Test Methods D143, D198 or analysis in accordance with Practice D3737, is required to establish these secondary properties. Reinforced glulam beams subjected to axial loads are outside the scope of this standard. This practice also provides minimum test requirements to validate the mechanics-based model.
1.2 The practice also describes a minimum set of performance-based durability test requirements for reinforced glulams, as specified in Annex A1. Additional durability test requirements shall be considered in accordance with the specific end-use environment. Appendix X1 provides an example of a mechanics-based methodology that satisfies the requirements set forth in this standard.
1.3 Characteristic strength and elastic properties obtained using this standard may be used as a basis for developing design values. However, the proper safety, serviceability and adjustment factors including duration of load, to be used in design are outside the scope of this standard.
1.4 This practice does not cover unbonded reinforcement, prestressed reinforcement, nor shear reinforcement.
1.5 The values stated in SI units are to be regarded as standard. The mechanics based model may be developed using SI or in.-lb units.
1.6 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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Standards Content (Sample)
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Designation: D7199 − 07 (Reapproved 2012)
Standard Practice for
Establishing Characteristic Values for Reinforced Glued
Laminated Timber (Glulam) Beams Using Mechanics-Based
1
Models
This standard is issued under the fixed designation D7199; 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. Scope 1.5 The values stated in SI units are to be regarded as
standard. The mechanics based model may be developed using
1.1 This practice covers mechanics-based requirements for
SI or in.-lb units.
calculatingcharacteristicvaluesforthestrengthandstiffnessof
1.6 This standard does not purport to address all of the
reinforced structural glued laminated timbers (glulam) manu-
safety concerns, if any, associated with its use. It is the
factured in accordance with applicable provisions of ANSI/
responsibility of the user of this standard to establish appro-
AITC A190.1, subjected to quasi-static loadings. It addresses
priate safety and health practices and determine the applica-
methods to obtain bending properties parallel to grain, about
bility of regulatory limitations prior to use.
the x-x axis (F and E ) for horizontally-laminated reinforced
bx x
glulam beams. Secondary properties such as bending about the
2. Referenced Documents
y-y axis (F ), shear parallel to grain (F and F ), tension
by vx vy
2
parallel to grain (F), compression parallel to grain (F ), and
2.1 ASTM Standards:
t c
compressionperpendiculartograin(F')arebeyondthescope
D9 Terminology Relating to Wood and Wood-Based Prod-
c
of this practice.When determination of secondary properties is
ucts
deemed necessary, testing according to other applicable
D143 Test Methods for Small Clear Specimens of Timber
methods, such as Test Methods D143, D198 or analysis in
D198 Test Methods of Static Tests of Lumber in Structural
accordance with Practice D3737, is required to establish these
Sizes
secondary properties. Reinforced glulam beams subjected to
D905 Test Method for Strength Properties of Adhesive
axial loads are outside the scope of this standard. This practice
Bonds in Shear by Compression Loading
also provides minimum test requirements to validate the
D1990 Practice for Establishing Allowable Properties for
mechanics-based model.
Visually-Graded Dimension Lumber from In-Grade Tests
of Full-Size Specimens
1.2 The practice also describes a minimum set of
D2559 Specification for Adhesives for Bonded Structural
performance-based durability test requirements for reinforced
Wood Products for Use Under Exterior Exposure Condi-
glulams, as specified in Annex A1. Additional durability test
tions
requirements shall be considered in accordance with the
D2915 Practice for Sampling and Data-Analysis for Struc-
specific end-use environment. Appendix X1 provides an ex-
tural Wood and Wood-Based Products
ample of a mechanics-based methodology that satisfies the
D3039/D3039M Test Method for Tensile Properties of Poly-
requirements set forth in this standard.
mer Matrix Composite Materials
1.3 Characteristic strength and elastic properties obtained
D3410/D3410M Test Method for Compressive Properties of
using this standard may be used as a basis for developing
Polymer Matrix Composite Materials with Unsupported
design values. However, the proper safety, serviceability and
Gage Section by Shear Loading
adjustment factors including duration of load, to be used in
D3737 Practice for Establishing Allowable Properties for
design are outside the scope of this standard.
Structural Glued Laminated Timber (Glulam)
1.4 This practice does not cover unbonded reinforcement,
D4761 Test Methods for Mechanical Properties of Lumber
prestressed reinforcement, nor shear reinforcement. and Wood-Base Structural Material
D5124 Practice for Testing and Use of a Random Number
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
2
Wood Products. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2012. Published October 2012. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2006. Last previous edition approved in 2007 as D7199 – 07. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7199-07R12. the ASTM website.
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D7199 − 07 (2012)
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