ASTM_D_7341_-_21.pdf

Designation:D734121Standard Practice forEstablishing Characteristic Values for Flexural Properties ofStructural Glued Laminated Timber by Full-Scale Testing1This standard is issued under the fixed designation D7341;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 describes procedures for full scale testingof structural glued laminated timber(glulam)to determine orverify characteristic values used to calculate flexural designproperties.Guidelines are given for:(1)testing individualstructural glued laminated timber lay-ups(with no modeling),(2)testing individual glulam combinations(with limitedmodeling),and(3)validating models used to predict charac-teristic values.1.2 This practice is limited to procedures for establishingflexural properties(Modulus of Rupture,MOR,and Modulusof Elasticity,MOE).Some of the principles for sampling andanalysis presented may be applicable to other properties.However,other properties may require additional testing con-siderations that are beyond the scope of this practice.1.3 This practice is not intended to supersede the provisionsof Practice D3737,but provides an alternative method forestablishing characteristic values.Lay-up combinations devel-oped in accordance with Practice D3737 are not required to begoverned by this standard.NOTE1The models described by Practice D3737 have been devel-oped and modified based on more than 50 years of experience and manytest programs.In some cases,however,it may be desirable to develop anew model based on other input properties or using lumber materials orgrades not covered by that standard.1.4 Details of production,inspection,and certification arebeyond the scope of this document.However,for test results tobe representative of production,quality control systems shallbe in place to ensure consistent quality.Manufacturing shallconform to recognized manufacturing standards such as ANSIA190.1 or CSA O122.1.5 The values stated in inch-pound units are to be regardedas standard.No other units of measurement are included in thisstandard.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,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 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:2D198 Test Methods of Static Tests of Lumber in StructuralSizesD245 Practice for Establishing Structural Grades and Re-lated Allowable Properties for Visually Graded LumberD2915 Practice for Sampling and Data-Analysis for Struc-tural Wood and Wood-Based ProductsD3737 Practice for Establishing Allowable Properties forStructural Glued Laminated Timber(Glulam)D4761 Test Methods for Mechanical Properties of Lumberand Wood-Based Structural MaterialsD5456 Specification for Evaluation of Structural CompositeLumber ProductsD6815 Specification for Evaluation of Duration of Load andCreep Effects of Wood and Wood-Based Products2.2 Other Standards:AITC Test T119 Full Size End Joint Tension Test3ANSI A190.1 American National Standard for Wood Prod-ucts Structural Glued Laminated Timber41This 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 April 1,2021.Published April 2021.Originallyapproved in 2008.Last previous edition approved in 2014 as D7341 14.DOI:10.1520/D7341-21.2For 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 website.3Available from the Pacific Lumber Inspection Bureau,1010 South 336th St.#210 Federal Way,WA 98003,http:/www.aitc-glulam.org.4Available from APAThe Engineered Wood Association,7011 South 19thStreet,Tacoma,WA 98466,http:/www.apawood.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 internationally 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.1ANSI/AWC NDS National Design Specification fo