ASTM_D_7617_-_D_7617M_-_11.pdf

Designation:D7617/D7617M11Standard Test Method forTransverse Shear Strength of Fiber-reinforced PolymerMatrix Composite Bars1This standard is issued under the fixed designation D7617/D7617M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method specifies the test requirements for(FRP)composite smooth round rods and textured bars fordetermining the transverse shear strength via a double shearfixture.FRP rods and bars are often loaded in transverse shearwhen these elements are used as dowels in concrete pavements,as stirrups in concrete beams,or as shear reinforcements inglued-laminated wood beams,for example.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.2.1 Within the text,the inch-pound units are shown inbrackets.1.3 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:2A615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete ReinforcementD883 Terminology Relating to PlasticsD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for MoistureAbsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsD7205/D7205M Test Method for Tensile Properties of FiberReinforced Polymer Matrix Composite BarsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or ProcessE456 Terminology Relating to Quality and Statistics3.Terminology3.1 Terminology in D3878 defines terms relating to high-modulus fibers and their composites.Terminology in D883defines terms relating to plastics.Terminology in E6 definesterms relating to mechanical testing.Terminology in E456defines terms relating to statistics and the selection of samplesizes.In the event of a conflict between terms,Terminology inD3878 shall have precedence over the other terminologystandards.3.2 Definitions of Terms Specific to This Standard:3.2.1 bar,na linear element,with a substantially roundcross section,often with surface undulations or a coating ofparticles that promote mechanical interlock with concrete.3.2.2 double shear fixture,na test fixture that results in thedesired shear force being applied to two distinct sections of thespecimen.3.2.3 failure,ncleavage of the bar under test into threepieces or into two pieces where the second non-cleaved shearplane is highly damaged.3.2.4 nominal cross sectional area,na measure of crosssectional area of a bar,determined over at least one represen-tative length,used to calculate stress.3.2.5 projected outer diameter,nthe smallest diameter ofa circle through which a bar,with its undulations or coatings,will pass.The bar may touch the circle but must pass throughwithout undue force.3.2.6 rod,na bar with a smooth circular cross section andno texture or deformations.3.2.7 standard cross sectional area,nthe cross sectionalarea of a standard numbered steel concrete reinforcing bar asgiven in A615/A615M,Table 1.3.2.8 surfaceundulation,nvariationinthearea,orientation,or shape of cross section of a bar along its length,1This test method is under the jurisdiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.10 onComposites for Civil Structures.Current edition approved March 1,2011.Published May 2011.DOI:10.1520/D7617_D7617M-11.2For 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 intended to enhance mechanical interlock between a bar andconcrete,made by any of a number of processes such as,forexample,indentation,addition of extra materials,and twisting.3.3 Symbols:3.3.1 Anominal or standard cross sectional area of a rod orbar,see D7205/D7205M.3.3.2 PSmaximum shear force carried by specimen Nlbf.3.3.3 utransverse shear strength,MPa psi.4.Summary of Test Method4.1 A length of fiber-reinforced polymer(FRP)rod or bar isfitted into a double shear fixture with appropriate cutting bladesand c