ASTM D7341-09
(Practice)Standard Practice for Establishing Characteristic Values for Flexural Properties of Structural Glued Laminated Timber by Full-Scale Testing
Standard Practice for Establishing Characteristic Values for Flexural Properties of Structural Glued Laminated Timber by Full-Scale Testing
SIGNIFICANCE AND USE
Full-scale bending testing is an effective way to determine flexural properties of structural glued laminated timber (glulam) beams. However, testing of large glulam members is cost prohibitive. Mathematical models, when confirmed by full-scale test results, are useful tools to assign flexural properties for glulam. This practice provides guidelines for sampling and testing full-scale glulam beams to determine their flexural properties and to validate mathematical models intended for use in assigning flexural design values.
SCOPE
1.1 This practice describes procedures for full scale testing of structural glued laminated timber (glulam) to determine or verify characteristic values used to calculate flexural design properties. Guidelines are given for: (1) testing individual structural glued laminated timber lay-ups (with no modeling), (2) testing individual glulam combinations (with limited modeling), and (3) validating models used to predict characteristic values.
1.2 This practice is limited to procedures for establishing flexural properties (Modulus of Rupture, MOR, and Modulus of Elasticity, MOE). Some of the principles for sampling and analysis presented may be applicable to other properties. However, other properties may require additional testing considerations that are beyond the scope of this practice.
1.3 This practice is not intended to supersede the provisions of Practice D 3737, but provides an alternative method for establishing characteristic values. Lay-up combinations developed in accordance with Practice D 3737 are not required to be governed by this standard.
Note 1—The models described by Practice D 3737 have been developed and modified based on more than 50 years of experience and many test programs. In some cases, however, it may be desirable to develop a new model based on other input properties or using lumber materials or grades not covered by that standard.
1.4 Details of production, inspection, and certification are beyond the scope of this document. However, for test results to be representative of production, quality control systems shall be in place to ensure consistent quality. Manufacturing shall conform to recognized manufacturing standards such as ANSI/AITC A190.1 or CSA O122.
1.5 Adjustments to characteristic values to determine reference values for design shall be in accordance with Practice D 2915 for allowable stress design (ASD) or Specification D 5457 for load and resistance factor design (LRFD).
1.6 Adjustments to ASD reference values for end-use conditions intended for design purposes shall be performed in accordance with Practice D 3737. The same adjustment factors shall apply to LRFD reference values, except that the ASD load duration factor shall be replaced by an appropriate LRFD time effect factor as determined in accordance with recognized industry practice.
1.7 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.
1.8 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: D7341 − 09
StandardPractice for
Establishing Characteristic Values for Flexural Properties of
1
Structural Glued Laminated Timber by Full-Scale Testing
This standard is issued under the fixed designation D7341; 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 1.6 Adjustments to ASD reference values for end-use con-
ditions intended for design purposes shall be performed in
1.1 This practice describes procedures for full scale testing
accordance with Practice D3737. The same adjustment factors
of structural glued laminated timber (glulam) to determine or
shall apply to LRFD reference values, except that the ASD
verify characteristic values used to calculate flexural design
load duration factor shall be replaced by an appropriate LRFD
properties. Guidelines are given for: (1) testing individual
time effect factor as determined in accordance with recognized
structural glued laminated timber lay-ups (with no modeling),
industry practice.
(2) testing individual glulam combinations (with limited
modeling), and (3) validating models used to predict charac-
1.7 The values stated in inch-pound units are to be regarded
teristic values.
as standard. No other units of measurement are included in this
1.2 This practice is limited to procedures for establishing
standard.
flexural properties (Modulus of Rupture, MOR, and Modulus
1.8 This standard does not purport to address all of the
of Elasticity, MOE). Some of the principles for sampling and
safety concerns, if any, associated with its use. It is the
analysis presented may be applicable to other properties.
responsibility of the user of this standard to establish appro-
However, other properties may require additional testing con-
priate safety and health practices and determine the applica-
siderations that are beyond the scope of this practice.
bility of regulatory limitations prior to use.
1.3 This practice is not intended to supersede the provisions
of Practice D3737, but provides an alternative method for
2. Referenced Documents
establishing characteristic values. Lay-up combinations devel-
2
2.1 ASTM Standards:
oped in accordance with Practice D3737 are not required to be
D198 Test Methods of Static Tests of Lumber in Structural
governed by this standard.
NOTE 1—The models described by Practice D3737 have been devel- Sizes
oped and modified based on more than 50 years of experience and many
D245 Practice for Establishing Structural Grades and Re-
test programs. In some cases, however, it may be desirable to develop a
lated Allowable Properties for Visually Graded Lumber
new model based on other input properties or using lumber materials or
D2915 Practice for Sampling and Data-Analysis for Struc-
grades not covered by that standard.
tural Wood and Wood-Based Products
1.4 Details of production, inspection, and certification are
D3737 Practice for Establishing Allowable Properties for
beyond the scope of this document. However, for test results to
Structural Glued Laminated Timber (Glulam)
be representative of production, quality control systems shall
D4761 Test Methods for Mechanical Properties of Lumber
be in place to ensure consistent quality. Manufacturing shall
and Wood-Base Structural Material
conform to recognized manufacturing standards such asANSI/
D5456 Specification for Evaluation of Structural Composite
AITC A190.1 or CSA O122.
Lumber Products
1.5 Adjustments to characteristic values to determine refer-
D5457 Specification for Computing Reference Resistance of
ence values for design shall be in accordance with Practice
Wood-Based Materials and Structural Connections for
D2915 for allowable stress design (ASD) or Specification
Load and Resistance Factor Design
D5457 for load and resistance factor design (LRFD).
D6815 Specification for Evaluation of Duration of Load and
Creep Effects of Wood and Wood-Based Products
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 March 1, 2009. Published March 2009. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2008. Last previous edition approved in 2008 as D7341 – 08. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7341-09. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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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:D7341–08 Designation:D7341–09
Standard Practice for
Establishing Characteristic Values for Flexural Properties of
1
Structural Glued Laminated Timber by Full-Scale Testing
This standard is issued under the fixed designation D 7341; 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
1.1 This practice describes procedures for full scale testing of structural glued laminated timber (glulam) to determine or verify
characteristic values used to calculate flexural design properties. Guidelines are given for: (1) testing individual structural glued
laminated timber lay-ups (with no modeling), (2) testing individual glulam combinations (with limited modeling), and (3)
validating models used to predict characteristic values.
1.2 This practice is limited to procedures for establishing flexural properties (Modulus of Rupture, MOR, and Modulus of
Elasticity,MOE).Someoftheprinciplesforsamplingandanalysispresentedmaybeapplicabletootherproperties.However,other
properties may require additional testing considerations that are beyond the scope of this practice.
1.3 This practice is not intended to supersede the provisions of Practice D 3737, but provides an alternative method for
establishing characteristic values. Lay-up combinations developed in accordance with Practice D 3737 are not required to be
governed by this standard.
NOTE 1—The models described by Practice D 3737 have been developed and modified based on more than 50 years of experience and many test
programs. In some cases, however, it may be desirable to develop a new model based on other input properties or using lumber materials or grades not
covered by that standard.
1.4 Details of production, inspection, and certification are beyond the scope of this document. However, for test results to be
representative of production, quality control systems shall be in place to ensure consistent quality. Manufacturing shall conform
to recognized manufacturing standards such as ANSI/AITC A190.1 or CSA O122.
1.5 Adjustments to characteristic values to determine reference values for design shall be in accordance with Practice D 2915
for allowable stress design (ASD) or Specification D 5457 for load and resistance factor design (LRFD).
1.6 Adjustments toASD reference values for end-use conditions intended for design purposes shall be performed in accordance
with Practice D 3737. The same adjustment factors shall apply to LRFD reference values, except that the ASD “load duration”
factor shall be replaced by an appropriate LRFD “time effect” factor as determined in accordance with recognized industry
practice.
1.7. The same adjustment factors shall apply to LRFD reference values, except that the ASD load duration factor shall be
replaced by an appropriate LRFD time effect factor as determined in accordance with recognized industry practice.
1.7 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this
standard.
1.8 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:
D 198 Test Methods of Static Tests of Lumber in Structural Sizes
D 245 Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber
D 2915 Practice for Evaluating Allowable Properties for Grades of Structural Lumber
D 3737 Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)
D 4761 Test Methods for Mechanical Properties of Lumber and Wood-Base Structural Material
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 Feb. 1, 2008. Published February 2008.
Current edition approved March 1, 2009. Published March 2009. Originally approved in 2008. Last previous edition approved in 2008 as D 7341 – 08.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information,
...
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