ASTM_D_7341_-_14.pdf

Designation:D734114Standard 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 Adjustments to characteristic values to determine refer-ence values for design shall be in accordance with PracticeD2915 for allowable stress design(ASD)or SpecificationD5457 for load and resistance factor design(LRFD).1.6 Adjustments to ASD reference values for end-use con-ditions intended for design purposes shall be performed inaccordance with Practice D3737.The same adjustment factorsshall apply to LRFD reference values,except that the ASDload duration factor shall be replaced by an appropriate LRFDtime effect factor as determined in accordance with recognizedindustry practice.1.7 The values stated in inch-pound units are to be regardedas standard.No other units of measurement are included in thisstandard.1.8 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: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-Base Structural MaterialD5456 Specification for Evaluation of Structural CompositeLumber ProductsD5457 Specification for Computing Reference Resistance ofWood-Based Materials and Structural Connections forLoad and Resistance Factor DesignD6815 Specification for Evaluation of Duration of Load andCreep Effects of Wood and Wood-Based Products1This 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 Feb.1,2014.Published March 2014.Originallyapproved in 2008.Last previous edition approved in 2009 as D7341 09.DOI:10.1520/D7341-14.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 2.2 Other Standards:AITC Test T119 Full Size End Joint Tension Test3ANSI A190.1 American National Standard for Wood Prod-ucts Structural Glued Laminated Timber4CSA O122 Structural Glued Laminated Timber5PS-20 Voluntary Product Standard,ALS63.Terminology3.1 DefinitionsFor definitions of terms related to wood,refer to Terminology D9.3.2 Definitions of Terms S