ASTM_D_3737_-_12.pdf

Designation:D373712Standard Practice forEstablishing Allowable Properties for Structural GluedLaminated Timber(Glulam)1This standard is issued under the fixed designation D3737;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 the procedures for establishingallowable properties for structural glued laminated timber.Included are the allowable stresses for bending,tension andcompression parallel to the grain,horizontal shear,compres-sion perpendicular to the grain,and radial tension and com-pression in curved members.Also included are modulus ofelasticity and modulus of rigidity.1.2 This practice is limited to the calculation of allowableproperties subject to the given procedures for the selection andarrangement of grades of lumber of the species considered.1.3 Requirements for production,inspection and certifica-tion are not included,but in order to justify the allowableproperties developed using procedures in this practice,manu-facturers must conform to recognized manufacturing standards.Refer to ANSI/AITC A190.1 and CSA O122.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 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:2D9 Terminology Relating to Wood and Wood-Based Prod-uctsD143 Test Methods for Small Clear Specimens of TimberD198 Test Methods of Static Tests of Lumber in StructuralSizesD245 Practice for Establishing Structural Grades and Re-lated Allowable Properties for Visually Graded LumberD2395 Test Methods for Density and Specific Gravity(Rela-tive Density)of Wood and Wood-Based MaterialsD2555 Practice for Establishing Clear Wood Strength ValuesD2915 Practice for Sampling and Data-Analysis for Struc-tural Wood and Wood-Based ProductsD4761 Test Methods for Mechanical Properties of Lumberand Wood-Base Structural MaterialD5456 Specification for Evaluation of Structural CompositeLumber ProductsD6570 Practice for Assigning Allowable Properties for Me-chanically Graded LumberE105 Practice for Probability Sampling of Materials2.2 AITC Standards:3ANSI/AITC A190.1 Structural Glued Laminated Timber,20072.3 Other Standards:ANSI/AF&PANational Design Specification for WoodConstruction4CSA O122 Structural Glued Laminated Timber53.Terminology3.1 Definitions:3.1.1 alternative lumberlaminated veneer lumber(LVL),laminated strand lumber(LSL),oriented strand lumber(OSL),or parallel strand lumber(PSL)meeting the requirements ofSpecification D5456;or solid-sawn lumber that is producedaccording to Practice D6570 and the grading rules of theapplicable grading or inspection agency.3.1.2 E-rated lumberlumber graded for use in manufac-turing structural glued laminated timber by nondestructivemeasurement of a modulus of elasticity(E)and by visual1This 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 Nov.1,2012.Published December 2012.Originallyapproved in 1978.Last previous edition approved in 2009 as D3737 09E01.DOI:10.1520/D3737-12.2For 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 American Institute of Timber Construction,7012 S.RevereParkway,Suite 140,Centennial,CO 80112,https:/www.aitc-glulam.org.4Available from American Forest and Paper Association(AF&PA),1111 19thSt.,NW,Suite 800,Washington,DC 20036,http:/www.afandpa.org.5Available from Canadian Standards Association(CSA),5060 Spectrum Way,Mississauga,ON L4W 5N6,Canada,http:/www.csa.ca.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 inspection in accordance with the grading rules of the appli-cable grading or inspection agency.3.1.3 glulama term used to denote structural glued lami-nated timber,which is a product made from suitably selectedand prepared pieces of wood bonded together with an adhesiveeither in a straight or curved form with the grain of all piecesessentially parallel to the longitudinal axis of the member.3.1.4 horizontally laminated timbera member designed toresist bending loads applied perpendicularly to the wide facesof the laminations(referred to as bending