ASTM_C_1824_-_16e1.pdf

Designation:C1824161Standard Test Method forFull Scale Bending Test of Spun Prestressed ConcreteBases for Tapered Steel Lighting Poles1This standard is issued under the fixed designation C1824;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.1NOTEEditorial changes were made in March 2016.1.Scope1.1 This test method covers determination of ultimate bend-ing moment capacity and cracking moment capacity of con-crete bases used as foundations for tapered steel lighting polesin accordance to Specification C1804.1.2 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.1.3 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:C39 Test Method for Compressive Strength of CylindricalConcrete SpecimensC192 Practice for Making and Curing Concrete Test Speci-mens in the LaboratoryC1804 Specification for Spun Cast Prestressed ConcreteBases for Tapered Steel Lighting Poles3.Terminology3.1 Definitions:3.1.1 cracking loada load which creates a bending mo-ment of enough magnitude to produce a tensile stress greaterthan the sum of induced compression plus the tensile strengthof the concrete resulting in tensile cracks on the tension face ofthe base.3.1.2 cylindrical sectionlower portion of base designed tobe buried in concrete backfill below ground line.3.1.3 ground lineis the distance from the butt end of thebase to the point where theoretical embedment in the founda-tion is specified(theoretical buried depth).3.1.4 second crack(re-cracking)loadthe load at which apreviously formed crack will reopen.3.1.5 spun basea base in which the concrete is distributedand compacted through centrifugal force.3.1.6 tapered sectionupper portion of base,which has ataper designed to match overlapping steel pole taper.3.1.7 ultimate loadmaximum test load the base will carryin the specified direction before the steel or concrete will reachits limiting state.4.Summary of Test Method4.1 This test consists of applying transverse loads at apredetermined distance to simulate bending moments inducedby wind forces exerted on the spun concrete base.The base istested in a horizontal orientation.The concrete base specimenis laterally supported at two locations:at the ground line andnear the bottom end of the base.The bending load is appliedthrough a steel test arm consisting of a matching taper steeladaptor with appropriate extension,which is of sufficientlength to deem shear effects negligible.Bending loads areapplied gradually at a predetermined loading sequence.Thetest bending moment is determined by multiplying the momentarm measured from the simulated ground line to the loadapplication point multiplied by the applied load value.Due tothe relatively short height of these bases extending aboveground line in comparison to the entire structure height,obtaining deflection data is not required.5.Significance and Use5.1This test method is intended to provide the user withacceptable apparatus requirements and a prescribed procedureto determine the bending moment capacity of spun pre-stressedconcrete bases for use with tapered steel poles.5.2 The results of this test method are used as a basis forverification of calculated bending moment capacity,qualitycontrol tool for manufacturing process and as a basis fordetermining statistical bending moment capacity.1This test method is under the jurisdiction of ASTM Committee C27 on PrecastConcrete Products and is the direct responsibility of Subcommittee C27.20 onArchitectural and Structural Products.Current edition approved Jan.1,2016.Published January 2016.DOI:10.1520/C182416E01.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3 This test method shall not be used for full lengthprestressed concrete,steel,or composite poles.6.Apparatus6.1 General RequirementsThe test area,fixtures and adap-tors shall be sized to accommodate the largest test specimenswith adequate margin to include upper tolerances of testspecimens.The general layout shall allow for application oftransverse loads in direction perpendicular to the centerline oftest specimen(see Fig.1).6.2 Loading ApparatusThe loading apparatus consists ofa winch and a steel cable through which the load is applied tothe test arm.The winch machine shall be capable of applyingloads that are required to test the bases to failure.The loadingapparatus shall