ASTM D6815-22a

Standard Specification for Evaluation of Duration of Load and Creep Effects of Wood and Wood-Based Products

ABSTRACT
This specification covers the procedure for testing and evaluating duration of load and creep effects of wood and wood-based materials relative to an accepted duration of load adjustment model. This specification is proposed for use for products that are covered by a consensus standard such as lumber, structural composite lumber and structural use panels. The procedure covered in this specification, however, is not intended to evaluate performance of products under impact loading.
SCOPE
1.1 This specification provides a procedure for testing and evaluating duration of load and creep effects of wood and wood-based materials relative to an accepted duration of load adjustment model. This specification was created for products that are currently covered by a consensus standard (for example, lumber, structural composite lumber, and structural-use panels). This procedure is intended to demonstrate the engineering equivalence to the duration of load and creep effects of visually graded lumber as specified in Practice D245 for a product under evaluation used in dry service conditions. This procedure is not intended to evaluate the performance of products under impact loading. Quantification of specific duration of load or creep factors is beyond the scope of this specification. For further guidance regarding the applicability of this specification refer to X1.1 in the Commentary.  
1.2 Use of the procedure in this specification to determine equivalence to the Practice D245 duration of load relationship is limited to solid wood and wood-based products whose long term load behavior is similar to that of solid wood. Equivalence demonstrated in this specification is dependent upon evaluation of a product's 90-day (minimum) creep-rupture performance. In this evaluation, three criteria must be satisfied: (1) adequate strength over a 90-day period, (2) decreasing creep rate, and (3) limited fractional deflection. A summary of the development of these criteria and the underlying assumptions behind them is provided in the Commentary in Appendix X1 and Appendix X2.  
1.3 Long term degradation phenomena not described by a creep-rupture model are not addressed in this specification (see Commentary X1.2.4).  
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 international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Oct-2022
• ICS: 79.080 - Semi-manufactures of timber
• Technical Committee: D07 - Wood
• Drafting Committee: D07.01 - Fundamental Test Methods and Properties

Relations

• Refers: ASTM D4442-20 - Standard Test Methods for Direct Moisture Content Measurement of Wood and Wood-Based Materials
• Effective Date: 01-Mar-2020

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D6815 −22a
Standard Specification for
Evaluation of Duration of Load and Creep Effects of Wood
1
and Wood-Based Products
This standard is issued under the fixed designation D6815; 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 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This specification provides a procedure for testing and
ization established in the Decision on Principles for the
evaluating duration of load and creep effects of wood and
Development of International Standards, Guides and Recom-
wood-based materials relative to an accepted duration of load
mendations issued by the World Trade Organization Technical
adjustment model. This specification was created for products
Barriers to Trade (TBT) Committee.
that are currently covered by a consensus standard (for
example, lumber, structural composite lumber, and structural-
2. Referenced Documents
use panels). This procedure is intended to demonstrate the
2
2.1 ASTM Standards:
engineering equivalence to the duration of load and creep
D9 Terminology Relating to Wood and Wood-Based Prod-
effects of visually graded lumber as specified in Practice D245
ucts
for a product under evaluation used in dry service conditions.
D198 Test Methods of Static Tests of Lumber in Structural
This procedure is not intended to evaluate the performance of
Sizes
products under impact loading. Quantification of specific
D245 Practice for Establishing Structural Grades and Re-
duration of load or creep factors is beyond the scope of this
lated Allowable Properties for Visually Graded Lumber
specification. For further guidance regarding the applicability
D1037 Test Methods for Evaluating Properties of Wood-
of this specification refer to X1.1 in the Commentary.
Base Fiber and Particle Panel Materials
1.2 Use of the procedure in this specification to determine
D2915 Practice for Sampling and Data-Analysis for Struc-
equivalence to the Practice D245 duration of load relationship
tural Wood and Wood-Based Products
is limited to solid wood and wood-based products whose long
D3043 Test Methods for Structural Panels in Flexure
termloadbehaviorissimilartothatofsolidwood.Equivalence
D4442 Test Methods for Direct Moisture Content Measure-
demonstratedinthisspecificationisdependentuponevaluation
ment of Wood and Wood-Based Materials
of a product’s 90-day (minimum) creep-rupture performance.
D4761 Test Methods for Mechanical Properties of Lumber
In this evaluation, three criteria must be satisfied: (1) adequate
and Wood-Based Structural Materials
strengthovera90-dayperiod,(2)decreasingcreeprate,and(3)
E4 Practices for Force Calibration and Verification of Test-
limited fractional deflection.Asummary of the development of
ing Machines
these criteria and the underlying assumptions behind them is
E6 Terminology Relating to Methods of Mechanical Testing
provided in the Commentary in Appendix X1 and Appendix
E177 Practice for Use of the Terms Precision and Bias in
X2.
ASTM Test Methods
2.2 Other References:
1.3 Long term degradation phenomena not described by a
ANSI/AWS NDS National Design Specification (NDS) for
creep-rupture model are not addressed in this specification (see
3
Wood Construction
Commentary X1.2.4).
1.4 The values stated in inch-pound units are to be regarded
3. Terminology
as standard. The values given in parentheses are mathematical
3.1 Definitions—See Terminologies D9 and E6 and Prac-
conversions to SI units that are provided for information only
tices E4 and E177 for definitions of terms used in this
and are not considered standard.
specification.
1 2
This specification is under the jurisdiction ofASTM Committee D07 on Wood For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and is the direct responsibility of Subcommittee D07.01 on Fundamental Test contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Methods and Properties. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Nov. 1, 2022. Published November 2022. Originally the ASTM website.
3
approved in 2002. Last previous edition approved in 2022 as D6815– 22. DOI: Available fromAmerican Wood Council (AWC), 222 Catoctin Circle SE, Suite
10.1520/D6815-22A. 201, Leesburg, VA 20175, https://www.awc.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA
...

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.
Designation: D6815 − 22 D6815 − 22a
Standard Specification for
Evaluation of Duration of Load and Creep Effects of Wood
1
and Wood-Based Products
This standard is issued under the fixed designation D6815; 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 specification provides a procedure for testing and evaluating duration of load and creep effects of wood and wood-based
materials relative to an accepted duration of load adjustment model. This specification was created for products that are currently
covered by a consensus standard (for example, lumber, structural composite lumber, and structural-use panels). This procedure is
intended to demonstrate the engineering equivalence to the duration of load and creep effects of visually graded lumber as specified
in Practice D245 for a product under evaluation used in dry service conditions. This procedure is not intended to evaluate the
performance of products under impact loading. Quantification of specific duration of load or creep factors is beyond the scope of
this specification. For further guidance regarding the applicability of this specification refer to X1.1 in the Commentary.
1.2 Use of the procedure in this specification to determine equivalence to the Practice D245 duration of load relationship is limited
to solid wood and wood-based products whose long term load behavior is similar to that of solid wood. Equivalence demonstrated
in this specification is dependent upon evaluation of a product’s 90-day (minimum) creep-rupture performance. In this evaluation,
three criteria must be satisfied: (1) adequate strength over a 90-day period, (2) decreasing creep rate, and (3) limited fractional
deflection. A summary of the development of these criteria and the underlying assumptions behind them is provided in the
Commentary in Appendix X1 and Appendix X2.
1.3 Long term degradation phenomena not described by a creep-rupture model are not addressed in this specification (see
Commentary X1.2.4).
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 international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D9 Terminology Relating to Wood and Wood-Based Products
D198 Test Methods of Static Tests of Lumber in Structural Sizes
1
This specification is under the jurisdiction of ASTM Committee D07 on Wood and is the direct responsibility of Subcommittee D07.01 on Fundamental Test Methods
and Properties.
Current edition approved Aug. 1, 2022Nov. 1, 2022. Published September 2022November 2022. Originally approved in 2002. Last previous edition approved in 20152022
as D6815 - 09 (2015).D6815– 22. DOI: 10.1520/D6815-22.10.1520/D6815-22A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D6815 − 22a
D245 Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber
D1037 Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel Materials
D2915 Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products
D3043 Test Methods for Structural Panels in Flexure
D4442 Test Methods for Direct Moisture Content Measurement of Wood and Wood-Based Materials
D4761 Test Methods for Mechanical Properties of Lumber and Wood-Based Structural Materials
E4 Practices for Force Calibration and Verification of Testing Machines
E6 Terminology Relating to Methods of Mechanical Testing
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
2.2 Other References:
3
ANSI/AWS NDS Nati
...