1、Designation:D747021Standard Practice forEvaluating Elevated Temperature Performance of End-Jointed Lumber Studs1This standard is issued under the fixed designation D7470;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of las
2、t 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 is to be used to evaluate the elevatedtemperature performance of end-jointed lumber studs.1.2 Asymmetric wall as
3、sembly containing end-jointed lum-ber studs is exposed to a standard fire exposure specified inTest Methods E119.1.3 End-jointed lumber studs are deemed qualified if thewall assembly resists a standard fire exposure specified in TestMethods E119 for a period of 60 min or more.Qualification ofend-joi
4、nted lumber studs are restricted to the joint configura-tion and adhesive tested.1.4 This practice is used to evaluate the performance ofend-jointed lumber studs to heat and flame under controlledconditions,but does not by itself incorporate all factorsrequired for fire hazard or fire risk assessmen
5、t under actual fireconditions.1.5 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are forinformation only.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
6、 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 standard-ization established in the
7、 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:2C1396/C1396M Specification for Gypsum BoardD9 Terminology Relating to Wood and W
8、ood-Based Prod-uctsD4688 Test Method for Evaluating Structural Adhesives forFinger Jointing LumberD6513 Practice for Calculating the Superimposed Load onWood-frame Walls for Standard Fire-Resistance TestsE119 Test Methods for Fire Tests of Building Constructionand MaterialsF1667 Specification for Dr
9、iven Fasteners:Nails,Spikes,andStaples2.2 Other Standards:ANSI/AWC NDS National Design Specification for WoodConstruction33.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 end joint,njoi
10、nt formed by adhesive bonding ofmachined,mated surfaces at the ends of two pieces of lumber.3.2.1.1 DiscussionTypical end-joint configurations in-clude finger joints and scarf joints.3.2.2 end-jointed lumber,nlumber containing one or moreend joints.3.2.3 finger joint,nend joint formed by multiple in
11、terlock-ing tapered profiles(“fingers”).1This practice is under the jurisdiction of ASTM Committee D07 on Wood andis the direct responsibility of Subcommittee D07.02 on Lumber and EngineeredWood Products.Current edition approved July 15,2021.Published August 2021.Originallyapproved in 2008.Last prev
12、ious edition approved in 2015 as D7470 08(2015).DOI:10.1520/D7470-21.2For 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 onthe ASTM websi
13、te.3Available from American Wood Council(AWC),1111 Nineteenth Street,NW,Suite 800,Washington,DC 20036,http:/www.awc.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internation
14、ally recognized principles on standardization established 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 scarf joint,nend joint formed by a single taperedpr
15、ofile.4.Summary of Practice4.1 This practice shall be used to evaluate end-jointedlumber studs manufactured with a specific joint configurationand adhesive.This practice is intended to be limited to theevaluation of end-jointed lumber studs with a specific jointconfiguration,adhesive,and limited des
16、ign properties.Theresults are only applicable to end-jointed lumber studs using ajoint configuration with the same number of fingers and afinger length of at least equal length as qualified in 7.1.2 andshall have assigned design properties no greater than the gradelevel qualified in 7.1.2.5.Significance and Use5.1 End-jointed lumber studs used in fire resistance-ratedassemblies shall be able to support the superimposed designload for the specified time under an elevated temperatureexposure,when
