ASTM_D_8019_-_15.pdf

Designation:D801915Standard Test Methods forDetermining the Full Section Flexural Modulus and BendingStrength of Fiber Reinforced Polymer CrossarmsAssembled with Center Mount Brackets1This standard is issued under the fixed designation D8019;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 These test methods cover the determination of theflexural modulus and bending strength of both tangent anddeadend arms bent about their minor and major axes.Onemethod covers testing of assembled tangent crossarms includ-ing the tangent bracket and relative hardware.The othermethod covers testing of assembled deadend crossarms with adeadend bracket and relative phase loading hardware.Thefailure modes and associated stresses can be used for predictingthe phase load capacities of pultruded crossarms specific tocertain conductor loading scenarios.1.2 The test methods described in this standard can be usedfor predicting the vertical and horizontal component loads ofdeadend and tangent arms.Both deadend and tangent cros-sarms shall be tested in the two configurations described inFigures 1 and 2.This will permit the manufactures to publishboth vertical and horizontal design capacities for deadendcrossarm configurations so that two way bending stresses,caused by catenary effects,can be considered when developingthe capacity of the deadend crossarms by utility designengineers and manufacturers.1.3 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 nonconformancewith the standard.1.4 This standard will not address all factors that affect thephase loading capacity.1.5 This standard does not address the use of core materialsthat are added to increase the structural capacity of thecrossarms.Core material shall not be considered in thecalculations provided in this standard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE1There is no known ISO equivalent to this standard.2.Referenced Documents2.1 ASTM Standards:2D4968 Practice for Annual Review of Test Methods andSpecifications for PlasticsE4 Practices for Force Verification of Testing MachinesE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1Definitions of variables used in the calculations asshown in Section 11 are as follows:a=distance from phase hardware to the center mountbolt through the crossarm,in.(m),Aw=area of the webs in shear in.2m2,E=flexural modulus,psi(Pa),I=moment of inertia about the neutral axis of thecrossarm,in.4m4,L=support span,in.m,M=moment at failure,lbf-in Nm,P=ultimate or failure load acting through a single centermount bolt,lbf N,Sx=section modulus about the neutral axis of thecrossarm,in.3m3,V=in-plane shear force,lbf N,=bending stress at failure,psi Pa,=deflection relative to the applied load,in.m,max=maximum transverse shear stress,psi Pa,1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.18 on Reinforced Thermoset-ting Plastics.Current edition approved Dec.1,2015.Published January 2016.DOI:10.1520/D8019-15.2For 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 Q=static moment of area in.3m3,t=thickness of region or regions under consideration in.m.4.Summary of Test Methods Including Deadend andTangent Crossarm Configurations with CommercialHardware Attached4.1 Deadend Crossarms:4.1.1 The assembled deadend crossarm,including twophase single sided position hardware and a center mountbracket fabricated to the specifications as detailed by themanufacturer,is positioned in a three point bend apparatus andloaded until failure occurs.4.1.2 A center mount bracket or a fabricated test bracket,matching the bolt size and dimensional specifications of themanufacturers commercial bracket,is attached to the arm asdetailed by the manufacturer.4.1.3 A three point bend load is then induced into the crossarm assembly until a structural failure of the hardware orcrossarm occurs.4.1