ASTM C1824-2016e1 Standard Test Method for Full Scale Bending Test of Spun Prestressed Concrete Bases for Tapered Steel Lighting Poles《楔形钢制灯杆用离心铸造的预应力混凝土基座的全尺寸弯曲试验的标准试验方法》.pdf
《ASTM C1824-2016e1 Standard Test Method for Full Scale Bending Test of Spun Prestressed Concrete Bases for Tapered Steel Lighting Poles《楔形钢制灯杆用离心铸造的预应力混凝土基座的全尺寸弯曲试验的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1824-2016e1 Standard Test Method for Full Scale Bending Test of Spun Prestressed Concrete Bases for Tapered Steel Lighting Poles《楔形钢制灯杆用离心铸造的预应力混凝土基座的全尺寸弯曲试验的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1824 161Standard 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
2、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 ultim
3、ate 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 t
4、o 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 de
5、termine 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 Prestre
6、ssed 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 o
7、n 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
8、.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
9、.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
10、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 app
11、ropriate 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
12、 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 Use5.1 This test method is intended to provide the user withacceptable apparatus requirem
13、ents 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
14、 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. Publishe
15、d January 2016. DOI: 10.1520/C182416E01.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.3 This test method shall not be used for full lengthprestressed concrete, steel, or composite poles.6. Apparatus6.1 General RequirementsThe test
16、 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 Loa
17、ding 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 be capable of applying the required loadingsequenc
18、e in continuous manner. The loading apparatus shall becapable of starting and stopping force application under load,as well as, it shall be capable of maintaining a static load at anypoint during the test sequence.6.3 Test ArmThe test arm shall consist of tapered steeladaptor and extension. The insi
19、de diameter and taper of theadaptor shall match the outside diameter and taper of the testspecimen. The extension shall be long enough to allow for aload application point with a moment arm that will ensure thatthe base primary mode of failure is in flexure with negligibleshear effects. The test arm
20、 shall be supported by rollingsupports to eliminate the effects of gravity loading in thevertical direction perpendicular to the test plane due to theweight of the test arm.6.4 Load CellThe load cell shall have a capacity greaterthan the load necessary to test the bases to failure. Resolutionof the
21、load cell shall be smaller than 10 lb or 1 % of theultimate load whichever is greater. The load cell shall beattached to the moment arm extension. The load cell and loadcell controller shall have current calibration certificate. Cali-bration shall be performed annually.6.5 Fixturing of Test Specimen
22、The test specimen shall belaterally supported at the two reaction points by rigid fixturingbrackets with contact area large enough, at least 20 % of thebase circumference by 8 in. (200 mm) length, to avoid damagedue to stress concentration. The fixturing brackets shall belined with elastomeric mater
23、ial (Neoprene or SBR sheetrubber) at least12 in. (12.5 mm) thick and minimum 70durometer hardness. Alternatively, seasoned oak at least 4 in.(100 mm) thick can be used as a lining material. The distancebetween the reaction points (center to center of supports) shallnot be less than 5.5 ft (1680 mm)
24、to minimize the shear effectsat ground line section. The designed ground line location shallbe aligned with the edge of support bracket on the loading side.The bottom end of the test specimen shall extend at least 18 in.from the bottom support bracket7. Setup Tolerances7.1 The test specimen centerli
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