ASTM D5457-21
(Specification)Standard Specification for Computing Reference Resistance of Wood-Based Materials and Structural Connections for Load and Resistance Factor Design
Standard Specification for Computing Reference Resistance of Wood-Based Materials and Structural Connections for Load and Resistance Factor Design
ABSTRACT
This specification covers procedures for computing the reference resistance of wood-based materials and structural connections for use in load and resistance factor design (LRFD). Parameters required for the derivation of reference resistance are presented. These parameters include the distribution percentile, coefficient of variation, data confidence factor, and reliability normalization factor. The shape and scale parameters of the two-parameter Weibull distribution shall be established to define the distribution of the material resistance. The data confidence factor accounts for uncertainty associated with data sets. This factor, which is a function of coefficient of variation, sample size, and reference percentile, is applied as a multiplier on the distribution estimate. The reliability normalization factor is used to adjust the distribution estimate to achieve a target reliability index. The reliability normalization factor is the ratio of the computed resistance factor to the specified resistance factor, adjusted by a scaling factor.
SCOPE
1.1 This specification covers procedures for computing the reference resistance of wood-based materials and structural connections for use in load and resistance factor design (LRFD). The format conversion procedure is outlined in Section 4. The test-based derivation procedure is outlined in Annex A1. The reference resistance derived from this specification applies to the design of structures addressed by the load combinations in ASCE 7-16.
1.2 A commentary to this specification is provided in Appendix X1.
1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.4 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.
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Designation:D5457 −21
Standard Specification for
Computing Reference Resistance of Wood-Based Materials
and Structural Connections for Load and Resistance Factor
1
Design
This standard is issued under the fixed designation D5457; 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.
INTRODUCTION
Load and resistance factor design (LRFD) is a structural design method that uses concepts from
reliability theory and incorporates them into a procedure usable by the design community. The basic
design equation requires establishing a reference resistance based on several material property
parameters. A standard method for calculating the required material property input data is critical so
that all wood-based structural materials can be treated equitably. This specification provides the
procedures that are required for the generation of reference resistance for LRFD.
1. Scope 2. Referenced Documents
2
1.1 This specification covers procedures for computing the 2.1 ASTM Standards:
reference resistance of wood-based materials and structural D9 Terminology Relating to Wood and Wood-Based Prod-
connections for use in load and resistance factor design ucts
(LRFD). The format conversion procedure is outlined in D143 Test Methods for Small Clear Specimens of Timber
Section 4. The test-based derivation procedure is outlined in D198 Test Methods of Static Tests of Lumber in Structural
Annex A1. The reference resistance derived from this specifi- Sizes
cation applies to the design of structures addressed by the load D1037 Test Methods for Evaluating Properties of Wood-
combinations in ASCE 7-16. Base Fiber and Particle Panel Materials
D1761 Test Methods for Mechanical Fasteners in Wood and
1.2 A commentary to this specification is provided in
Wood-Based Materials
Appendix X1.
D1990 Practice for Establishing Allowable Properties for
1.3 The values stated in inch-pound units are to be regarded
Visually-Graded Dimension Lumber from In-Grade Tests
asthestandard.Thevaluesgiveninparenthesesaremathemati-
of Full-Size Specimens
cal conversions to SI units that are provided for information
D2718 Test Methods for Structural Panels in Planar Shear
only and are not considered standard.
(Rolling Shear)
1.4 This international standard was developed in accor- D2719 Test Methods for Wood Structural Panels in Shear
dance with internationally recognized principles on standard-
Through-the-Thickness
ization established in the Decision on Principles for the
D2915 Practice for Sampling and Data-Analysis for Struc-
Development of International Standards, Guides and Recom- tural Wood and Wood-Based Products
mendations issued by the World Trade Organization Technical
D3043 Test Methods for Structural Panels in Flexure
Barriers to Trade (TBT) Committee. D3500 Test Methods for Wood Structural Panels in Tension
D3501 Test Methods for Wood-Based Structural Panels in
Compression
1
This specification is under the jurisdiction ofASTM 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 April 1, 2021. Published April 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1993. Last previous edition approved in 2020 as D5457 – 20. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D5457-21. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D5457−21
D3737 Practice for Establishing Allowable Properties for 3.2.10 reference resistance, R —the design value at refer-
n
Structural Glued Laminated Timber (Glulam) ence conditions used in LRFD to represent member resistance
D4761 Test Methods for Mechanical Properties of Lumber prior to application of the resistance factor (ϕ) and the time
and Wood-Based Structural Materials effect factor (λ).
D5055 Specification for Establishing and Monitoring Struc- 3.2.10.1 Discussion—The reference value represents mem-
tural Capacities of Prefabricated Wood I-Joists ber resistance at 10-minute load duration.
D5456 Specification for Evaluation of Structural Composite
3.2.11 reliability normalization factor, K —a factor used to
R
Lumber Products
establish the reference resistance (R ) to achieve a target
n
E105 Practice for Probability Sampling of Materials
reliability index for a specific set of conditions.
3
2.2 ASCE Standard:
3.2.12 resistance
...
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: D5457 − 20 D5457 − 21
Standard Specification for
Computing Reference Resistance of Wood-Based Materials
and Structural Connections for Load and Resistance Factor
1
Design
This standard is issued under the fixed designation D5457; 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.
INTRODUCTION
Load and resistance factor design (LRFD) is a structural design method that uses concepts from
reliability theory and incorporates them into a procedure usable by the design community. The basic
design equation requires establishing a reference resistance based on several material property
parameters. A standard method for calculating the required material property input data is critical so
that all wood-based structural materials can be treated equitably. This specification provides the
procedures that are required for the generation of reference resistance for LRFD.
1. Scope
1.1 This specification covers procedures for computing the reference resistance of wood-based materials and structural
connections for use in load and resistance factor design (LRFD). The format conversion procedure is outlined in Section 4. The
test-based derivation procedure is outlined in Annex A1. The reference resistance derived from this specification applies to the
design of structures addressed by the load combinations in ASCE 7-16.
1.2 A commentary to this specification is provided in Appendix X1.
1.3 Units—The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are
mathematical conversions to SI units that are provided for information only and are not considered standard.
1.4 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
D143 Test Methods for Small Clear Specimens of Timber
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 D07.02 on Lumber and Engineered Wood
Products.
Current edition approved April 1, 2020April 1, 2021. Published June 2020April 2021. Originally approved in 1993. Last previous edition approved in 20192020 as
D5457 – 19c.D5457 – 20. DOI: 10.1520/D5457-20.10.1520/D5457-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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
---------------------- Page: 1 ----------------------
D5457 − 21
D1037 Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel Materials
D1761 Test Methods for Mechanical Fasteners in Wood and Wood-Based Materials
D1990 Practice for Establishing Allowable Properties for Visually-Graded Dimension Lumber from In-Grade Tests of Full-Size
Specimens
D2718 Test Methods for Structural Panels in Planar Shear (Rolling Shear)
D2719 Test Methods for Wood Structural Panels in Shear Through-the-Thickness
D2915 Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products
D3043 Test Methods for Structural Panels in Flexure
D3500 Test Methods for Wood Structural Panels in Tension
D3501 Test Methods for Wood-Based Structural Panels in Compression
D3737 Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)
D4761 Test Methods for Mechanical Properties of Lumber and Wood-Based Structural Materials
D5055 Specification for Establishing and Monitoring Structural Capacities of Prefabricated Wood I-Joists
D5456 Specification for Evaluation of Structural Composite Lumber Products
E105 Practice for Probability Sampling of Materials
3
2.2 ASCE Standard:
ASCE 7-16 Minimum Design Loads and Associated Criteria for Buildings and Other Structures
3. Terminology
3.1 Definitions:
3.1.1 For general definition
...
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