1、Designation:D545715Standard 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 is
4、 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 reference resistance derived from this specifica-tion applies to the design of structures addressed by the loadcombinations in ASCE 7-10.1.2 A commentary to this specification is provided inAppendix X1.2.Referenced Docu
6、ments2.1 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 Wood-Base Fiber and Particle Panel MaterialsD1761 Test M
7、ethods for Mechanical Fasteners in WoodD1990 Practice for Establishing Allowable Properties forVisually-Graded Dimension Lumber from In-Grade Testsof Full-Size SpecimensD2718 Test Methods for Structural Panels in Planar Shear(Rolling Shear)D2719 Test Methods for Structural Panels in Shear Through-th
8、e-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 Structural Panels in TensionD3501 Test Methods for Wood-Based Structural Panels inCompressionD3737 Practice for Establishing
9、Allowable Properties forStructural Glued Laminated Timber(Glulam)D4761 Test Methods for Mechanical Properties of Lumberand Wood-Base Structural MaterialD5055 Specification for Establishing and Monitoring Struc-tural Capacities of Prefabricated Wood I-JoistsD5456 Specification for Evaluation of Struc
10、tural CompositeLumber ProductsE105 Practice for Probability Sampling of Materials2.2 ASCE Standard:3ASCE 7-10 Minimum Design Loads for Buildings and OtherStructures3.Terminology3.1 Definitions:3.1.1 For general definitions of terms related to wood,referto Terminology D9.1This specification is under
11、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 1,2015.Published June 2015.Originallyapproved in 1993.Last previous edition approved in 2012 as D5457 12.DOI:10.1520/D5457-15.2For
12、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 onthe ASTM website.3Available from The American Society of Civil Engineers(ASCE),1801Alexa
13、nder Bell Dr.,Reston,VA 20191.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.2 coeffcient of variation,CVwa relative measure ofvariability.For this specification,the calculation of CVwisbased on the shape parameter of the 2-parameter
14、 Weibulldistribution.It is not the traditional sample standard deviationof the data divided by the sample mean.3.1.3 data confidence factor,a factor that is used toadjust member reference resistance for sample variability andsample size.3.1.4 distribution percentile,Rpthe value of the distribu-tion
15、associated with proportion,p,of the cumulative distribu-tion function.3.1.5 format conversion factor,KFa factor applied toconvert resistance from the allowable stress design(ASD)format to the LRFD format.3.1.6 lower taila portion of an ordered data set consistingof all test specimens with the lowest
16、 property values(forexample,lowest strengths).3.1.7 reference resistance,Rnthe value used in LRFDequations to represent member resistance(that is,strength orcapacity).3.1.8 reliability normalization factor,KRa factor used toestablish the reference resistance to achieve a target reliabilityindex for a reference set of conditions.3.1.9 resistance factora factor applied to the resistanceside of the LRFD equation.4.Sampling4.1 Samples selected for analysis and implementation withthis specification s
