ASTM D5457-18
(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 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.
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Designation:D5457 −18
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.Anumber 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.Astandard 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 D9Terminology 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 D143Test Methods for Small Clear Specimens of Timber
Section 4. The test-based derivation procedure is outlined in D198Test 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 D1037Test Methods for Evaluating Properties of Wood-
combinations in ASCE 7-16. Base Fiber and Particle Panel Materials
D1761Test Methods for Mechanical Fasteners in Wood
1.2 A commentary to this specification is provided in
D1990Practice for Establishing Allowable Properties for
Appendix X1.
Visually-Graded Dimension Lumber from In-Grade Tests
1.3 Units—The values stated in inch-pound units are to be
of Full-Size Specimens
regarded as the standard. The values given in parentheses are
D2718Test Methods for Structural Panels in Planar Shear
mathematical conversions to SI units that are provided for
(Rolling Shear)
information only and are not considered standard.
D2719TestMethodsforStructuralPanelsinShearThrough-
1.4 This international standard was developed in accor- the-Thickness
dance with internationally recognized principles on standard-
D2915Practice for Sampling and Data-Analysis for Struc-
ization established in the Decision on Principles for the
tural Wood and Wood-Based Products
Development of International Standards, Guides and Recom- D3043Test Methods for Structural Panels in Flexure
mendations issued by the World Trade Organization Technical
D3500Test Methods for Structural Panels in Tension
Barriers to Trade (TBT) Committee. D3501Test Methods for Wood-Based Structural Panels in
Compression
1
This specification is under the jurisdiction ofASTM Committee D07 on Wood
andisthedirectresponsibilityofSubcommitteeD07.02onLumberandEngineered
2
Wood Products. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2018. Published December 2018. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1993. Last previous edition approved in 2017 as D5457–17. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D5457-18. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D5457−18
D3737Practice for Establishing Allowable Properties for 3.2.11 reliability normalization factor, K —a factor used to
R
Structural Glued Laminated Timber (Glulam) establish the reference resistance to achieve a target reliability
D4761Test Methods for Mechanical Properties of Lumber index for a reference set of conditions.
and Wood-Base Structural Material
3.2.12 resistance factor,ϕ—afactorappliedtotheresistance
D5055Specification for Establishing and Monitoring Struc-
side of the LRFD equation.
tural Capacities of Prefabricated Wood I-Joists
D5456Specification for Evaluation of Structural Composite
4. Reference Resistance for LRFD
Lumber Products
4.1 Reference resistance for LRFD shall be determined
E105Practice for Probability Sampling of Materials
using one of the following procedures:
3
2.2 ASCE Standard:
4.1.1 Format conversion per Section 4.2;or
ASCE7-16MinimumDesignLoadsandAssociatedCriteria
4.1.2 Test-based derivation per Annex A1.
for Buildings and Other Structures
4.2 Format
...
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 − 17 D5457 − 18
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 7-10.7-16.
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
D1037 Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel Materials
D1761 Test Methods for Mechanical Fasteners in Wood
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 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
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 Nov. 1, 2017Nov. 1, 2018. Published December 2017December 2018. Originally approved in 1993. Last previous edition approved in 20152017
as D5457 – 15.D5457 – 17. DOI: 10.1520/D5457-17.10.1520/D5457-18.
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 − 18
D3500 Test Methods for 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-Base Structural Material
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 7-107-16 Minimum Design Loads and Associated Criteria for Buildings and Other Structures
3. Terminology
3.1 Definitions:
3.1.1 For general definitions of terms related to wo
...
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