1、Designation:D651321Standard 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
2、,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-bear
3、ingwood-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-frameassembli
4、es for which the nationally recognized structuraldesign criteria are contained in the National Design Specifica-tion for Wood Construction(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
5、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 i
6、s theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internationally recognized principles on stan
7、dard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D9 Terminology Relating to Wood and Wood-Based Pr
8、od-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:2ANSI/AWC2018 National Design Specification(NDS)forWood
9、ConstructionNDS Supplement Design Values for Wood Construction3.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 effective column length,nunbraced
10、length of thevertical member,adjusted for end conditions.3.2.2 gross cross-sectional area,narea of cross sectioncalculated from overall actual dimensions of member.3.2.2.1 DiscussionFor lumber,gross cross-sectional areais based on the standard dressed size of the member as given inthe NDS Supplement
11、 for the nominal size member.3.2.3 net section area,narea of cross section calculated bydeducting from the gross cross-sectional area the projected areaof all materials removed by boring,grooving,dapping,notching,or other means.3.2.3.1 DiscussionFor nailed or screwed connections,thenet section area
12、equals the gross cross-sectional area.1This 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 July 1,2021.Published August 2021.Originallyapproved in 2000.Last previous edition approved
13、in 2014 as D6513 14.DOI:10.1520/D6513-21.2Available from American Wood Council,222 Catoctin Circle SE,Suite 201,Leesburg,VA 201753For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,r
14、efer 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established
15、 in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.13.2.4 superimposed load,nadditional external loadneeded to be applied to the assembly during the test to achieveth
16、e required stresses within the assembly after any dead load ofthe assembly 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.These test methods specify that this superim-posed load shall be as nearly as practicable the maximumallow
