ASTM_D_6513_-_14.pdf

Designation:D651314Standard Practice forCalculating the Superimposed Load on Wood-frame Wallsfor Standard Fire-Resistance Tests1This standard is issued under the fixed designation D6513;the number immediately following the designation indicates the year oforiginal 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.1.Scope1.1 This practice covers procedures for calculating thesuperimposed axial load required to be applied to load-bearingwood-frame walls throughout standard fire-resistance and fireand hose-stream tests.1.2 The calculations determine the maximum load allowedby design for wood-frame wall assemblies under nationallyrecognized structural design criteria.1.3 This practice is only applicable to those wood-frameassemblies for which the nationally recognized structuraldesign criteria is the National Design Specification for WoodConstruction(NDS).21.4 The system of units to be used is that of the nationallyrecognized structural design criteria.For the NDS,the units areinch-pound.1.5 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D9 Terminology Relating to Wood and Wood-Based Prod-uctsE119 Test Methods for Fire Tests of Building Constructionand MaterialsE176 Terminology of Fire StandardsE1529 Test Methods for Determining Effects of Large Hy-drocarbon Pool Fires on Structural Members and Assem-blies2.2 Other Standards:NDSNational Design Specification for Wood Construc-tion2NDS SupplementDesign Values for Wood Construction23.Terminology3.1 DefinitionsDefinitions used in this practice are inaccordance with Terminology D9 and Terminology E176,unless otherwise indicated.3.2 Definitions of Terms Specific to This Standard:3.2.1 gross area,nsection area calculated from overallactual dimensions of member.3.2.2 net section area,nsection area calculated by deduct-ing from the gross section area the projected area of allmaterials removed by boring,grooving,dapping,notching,orother means.3.2.3 superimposed load,nThe additional external loadneeded to be applied to the assembly to result in the calculatedstresses within the assembly when any dead load of theassembly itself is accounted for in the calculations.4.Significance and Use4.1 Test Methods E119 and E1529,and other standard fireresistance test methods specify that throughout exposures tofire and the hose stream,a constant superimposed axial load beapplied to a load-bearing test specimen to simulate a maximumload condition.They specify that this superimposed load shallbe as nearly as practicable the maximum load allowed bydesign under nationally recognized structural design criteria.For this practice,the nationally recognized structural designcriteria is the National Design Specification for Wood Con-struction(NDS).4.1.1 Alternatively,the standard fire resistance test methodsshall be conducted by applying an axial load that is less thanthe maximum allowable axial load as addressed by the NDSand this practice,but these tests shall be identified in the testreport as being conducted under restricted load conditions.The1This practice is under the jurisdiction of ASTM Committee D07 on Wood andis the direct responsibility of Subcommittee D07.05 on Wood Assemblies.Current edition approved Oct.1,2014.Published November 2014.Originallyapproved in 2000.Last previous edition approved in 2008 as D6513 08.DOI:10.1520/D6513-14.2Available from American Forest&Paper Association,American WoodCouncil,1111 19th Street,NW,Suite 800,Washington,DC 200363For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 superimposed axial load,as well as the superimposed axialload as a percentage of the maximum allowable axial designload as addressed by the NDS and this practice shall beincluded in the test report.4.2 This practice describes procedures for calculating thesuperimposed axial load to be applied in standard fire resis-tance tests of wood-frame wall assemblies.4.3 Statements in either the fire resistance test methodstandard or the nationally recognized structural design standardsupercede any procedures described by this practice.4.4 The NDS shall be consulted to e