ASTM D5457-12
(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 reference resistance derived from this specification applies to the design of structures addressed by the load combinations in ASCE 7-10.
1.2 A commentary to this specification is provided in Appendix X1.
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Designation:D5457 −12
StandardSpecification 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 of Full-Size Specimens
D2718Test Methods for Structural Panels in Planar Shear
1.1 This specification covers procedures for computing the
(Rolling Shear)
reference resistance of wood-based materials and structural
D2719TestMethodsforStructuralPanelsinShearThrough-
connections for use in load and resistance factor design
the-Thickness
(LRFD). The reference resistance derived from this specifica-
D2915Practice for Sampling and Data-Analysis for Struc-
tion applies to the design of structures addressed by the load
tural Wood and Wood-Based Products
combinations in ASCE 7-10.
D3043Test Methods for Structural Panels in Flexure
1.2 A commentary to this specification is provided in
D3500Test Methods for Structural Panels in Tension
Appendix X1.
D3501Test Methods for Wood-Based Structural Panels in
Compression
2. Referenced Documents
D3737Practice for Establishing Allowable Properties for
2
2.1 ASTM Standards:
Structural Glued Laminated Timber (Glulam)
D9Terminology Relating to Wood and Wood-Based Prod-
D4761Test Methods for Mechanical Properties of Lumber
ucts
and Wood-Base Structural Material
D143Test Methods for Small Clear Specimens of Timber
D5055Specification for Establishing and Monitoring Struc-
D198Test Methods of Static Tests of Lumber in Structural
tural Capacities of Prefabricated Wood I-Joists
Sizes
D5456Specification for Evaluation of Structural Composite
D1037Test Methods for Evaluating Properties of Wood-
Lumber Products
Base Fiber and Particle Panel Materials
E105Practice for Probability Sampling of Materials
D1761Test Methods for Mechanical Fasteners in Wood
3
2.2 ASCE Standard:
D1990Practice for Establishing Allowable Properties for
ASCE7-10MinimumDesignLoadsforBuildingsandOther
Visually-Graded Dimension Lumber from In-Grade Tests
Structures
3. Terminology
1
This specification is under the jurisdiction ofASTM Committee D07 on Wood
andisthedirectresponsibilityofSubcommitteeD07.02onLumberandEngineered
3.1 Definitions:
Wood Products.
3.1.1 For general definitions of terms related to wood, refer
CurrenteditionapprovedMay1,2012.PublishedJuly2012.Originallyapproved
to Terminology D9.
in 1993. Last previous edition approved in 2010 as D5457-10. DOI: 10.1520/
D5457-12.
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
3
Standards volume information, refer to the standard’s Document Summary page on Available from The American Society of Civil Engineers (ASCE), 1801
the ASTM website. Alexander Bell Dr., Reston, VA 20191.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D5457−12
3.1.2 coeffıcient of variation, CV —a relative measure of tail). Only parameter estimation procedures designed specifi-
w
variability. For this specification, the calculation of CV is cally for lower tail data sets shall be used (see Appendix X2).
w
based on the shape parameter of the 2-parameter Weibull
distribution. It is not the traditional sample standard deviation 5. Testing
of the data divided by the sample mean.
5.1 Testing shall be conducted in accordance with appropri-
3.1.3 data confidence factor, Ω—a factor that is used to
ate standard testing procedures. The intent of the testing shall
adjust member reference resistance for sample variability and
be to develop data that represent the capacity of the product in
sample size.
service.
3.1.4 distribution percentile, R —the value of the distribu-
p
5.2 Periodic Property Assessment—Periodic testing is rec-
tion associated with proportion, p, of the cumulative distribu-
ommended to verify that the properties
...
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:D5457–10 Designation: D5457 – 12
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 reference resistance derived from this specification applies
to the design of structures addressed by the load combinations in ASCE 7-027-10.
1.2 A commentary to this specification is provided in Appendix X1.
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 PracticeforEstablishingAllowablePropertiesforVisually-GradedDimensionLumberfromIn-GradeTestsofFull-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
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:
1
This specification is under the jurisdiction ofASTM Committee D07 onWood and is the direct responsibility of Subcommittee D07.02 on Lumber and EngineeredWood
Products.
Current edition approved Sept.May 1, 2010.2012. Published September 2010.July 2012. Originally approved in 1993. Last previous edition approved in 20042010 as
D5457-04A.D5457 - 10. DOI: 10.1520/D5457-102.
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, refer to the standard’s Document Summary page on the ASTM website.
3
Available from The American Society of Civil Engineers (ASCE), 1801 Alexander Bell Dr., Reston, VA 20191.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D5457 – 12
ASCE 7-02ASCE 7-10 Minimum Design Loads for Buildings and Other Structures
3. Terminology
3.1 Definitions:
3.1.1 For general definitions of terms related to wood, refer to Terminology D9.
3.1.2 coeffıcient of variation, CV —a relative measure of variability. For this specification, the calculation of CV is based on
w w
the shape parameter of the 2-parameter Weibull distribution. It is not the traditional sample standard deviation of the data divided
by the sample mean.
3.1.3 data confidence factor, V—a factor that is used to adjust member reference resistance for sample variability and sample
size.
3.1.4 distribution percentile, R —the value of the distribution associated with proportion, p, of the cumulative distribution
p
function.
3.1.5 format conversion factor,
...
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