1、Designation:D545721aStandard Specification forComputing Reference Resistance of Wood-Based Materialsand Structural Connections for Load and Resistance FactorDesign1This standard is issued under the fixed designation D5457;the number immediately following the designation indicates the year oforiginal
2、 adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONLoad and resistance factor design(LRFD)is a structural design method that
3、 uses concepts fromreliability theory and incorporates them into a procedure usable by the design community.The basicdesign equation requires establishing a reference resistance based on several material propertyparameters.A standard method for calculating the required material property input data i
4、s critical sothat all wood-based structural materials can be treated equitably.This specification provides theprocedures that are required for the generation of reference resistance for LRFD.1.Scope1.1 This specification covers procedures for computing thereference resistance of wood-based materials
5、 and structuralconnections for use in load and resistance factor design(LRFD).The format conversion procedure is outlined inSection 4.The test-based derivation procedure is outlined inAnnex A1.The reference resistance derived from this specifi-cation applies to the design of structures addressed by
6、the loadcombinations in ASCE 7-16.1.2 A commentary to this specification is provided inAppendix X1.1.3 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are mathemati-cal conversions to SI units that are provided for informationonly and are not c
7、onsidered standard.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization Te
8、chnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D9 Terminology Relating to Wood and Wood-Based Prod-uctsD143 Test Methods for Small Clear Specimens of TimberD198 Test Methods of Static Tests of Lumber in StructuralSizesD1037 Test Methods for Evaluating Properties of
9、Wood-Base Fiber and Particle Panel MaterialsD1761 Test Methods for Mechanical Fasteners in Wood andWood-Based MaterialsD1990 Practice for Establishing Allowable Properties forVisually-Graded Dimension Lumber from In-Grade Testsof Full-Size SpecimensD2718 Test Methods for Structural Panels in Planar
10、Shear(Rolling Shear)D2719 Test Methods for Wood Structural Panels in ShearThrough-the-ThicknessD2915 Practice for Sampling and Data-Analysis for Struc-tural Wood and Wood-Based ProductsD3043 Test Methods for Structural Panels in FlexureD3500 Test Methods for Wood Structural Panels in TensionD3501 Te
11、st Methods for Wood-Based Structural Panels inCompression1This specification is under the jurisdiction of ASTM Committee D07 on Woodand is the direct responsibility of Subcommittee D07.02 on Lumber and EngineeredWood Products.Current edition approved May 1,2021.Published May 2021.Originallyapproved
12、in 1993.Last previous edition approved in 2021 as D5457 21.DOI:10.1520/D5457-21A.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onth
13、e ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopmen
14、t of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1D3737 Practice for Establishing Allowable Properties forStructural Glued Laminated Timber(Glulam)D4761 Test Methods for Mechanical Properties of Lumberand Wood-Ba
15、sed Structural MaterialsD5055 Specification for Establishing and Monitoring Struc-tural Capacities of Prefabricated Wood I-JoistsD5456 Specification for Evaluation of Structural CompositeLumber ProductsE105 Practice for Probability Sampling of Materials2.2 ASCE Standard:3ASCE 7-16 Minimum Design Loa
16、ds andAssociated Criteriafor Buildings and Other Structures3.Terminology3.1 Definitions:3.1.1 For general definitions of terms related to wood,referto Terminology D9.3.2 Definitions of Terms Specific to This Standard:3.2.1 ASD reference design value,Fxthe design value atreference conditions used in allowable stress design(ASD)prior to application of the load duration factor(CD).3.2.2 coeffcient of variation,CVwthe standard deviationdivided by the mean of a 2-parameter Weibull distribution.3.2.2.
