1、Designation: F3359 18Standard Test Method forDetermining Bending Yield Moment of Staples1This standard is issued under the fixed designation F3359; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number
2、 in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers procedures for determining thebending yield moment of staples when subjected to staticloading. Although intended for
3、flat crown staples identified inSpecification F1667, this procedure is also applicable forstaples with round wire. These staples are used in engineeredwood building connection applications for which requiredconnection capacities are specified by the designer.1.2 The values stated in inch-pound units
4、 are to be regardedas standard. No other units of measurement are included in thisstandard.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, health, and envi
5、ronmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standa
6、rds, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2E4 Practices for Force Verification of Testing MachinesF1667 Specification for Driven Fasteners: Nails, Spikes, andStaples3. Terminology3.1 De
7、finitions of Terms Specific to This Standard:3.1.1 bending yield moment (My)the critical strength char-acteristic used in yield theory calculations and determined inaccordance with 9.2.3.1.2 flat crown staplea two-pronged fasteners in whichround or flattened wire is bent into an approximate U-shapew
8、ith approximately equivalent leg lengths.3.1.3 flat crown staple dimensionsAll dimensions takenbefore application of or after removal of any coating, as shownin Fig. 1.3.1.3.1 crown width (C)Distance measured along the topof the staple from the outside of the staple legs.3.1.3.2 leg length (L)Distan
9、ce from top of staple crown tobottom of leg.3.1.3.3 thickness (T)Distance perpendicular to the widthof the leg for a flattened wire staple.3.1.3.4 test span (Sbp)Cylindrical bearing point spacing(test span length) as shown in Fig. 2.3.1.3.5 width (W)Distance across the flatten portion ofwire.3.1.4 p
10、roportional limit loadis the load at which theload-deflection curve deviates from a straight line fitted to theinitial portion of the load- deflection curve as shown in Fig. 3.3.1.5 yield load (P)the load determined from the load-deflection curve in accordance with 9.1.3.1.6 yield theorythe model fo
11、r lateral load design valuesfor dowel-type fasteners that specifically accounts for thedifferent way connections behave under load.4. Summary of Test Method4.1 Test specimens are evaluated to determine capacity toresist lateral bending loads applied at a constant rate ofdeflection with a suitable te
12、sting machine. The load on the testspecimen at various intervals of deflection is measured.Supplementary physical properties of the test specimen are alsodetermined.5. Significance and Use5.1 Staples are mechanical fasteners used in wood struc-tures. Engineering design procedures used to determine t
13、hecapacities of laterally-loaded staple connections use a yieldtheory to establish nominal resistance (Note 1). In order todevelop nominal resistance for laterally-loaded stapledconnections, the bending yield moment must be known.NOTE 1When used as a structural fastener in shear walls and1This test
14、method is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.05 on Driven andOther Fasteners.Current edition approved Dec. 1, 2018. Published January 2019. DOI: 10.1520/F3359182For referenced ASTM standards, visit the ASTM website, www.astm.
15、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 StatesThis internat
16、ional standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Commit
17、tee.1diaphragms, staples are installed with the crown parallel to the longdimension of the framing member. The orientation of the staples for thisbending yield moment test represents the bending yield moment appli-cable for this intended use).FIG. 1 Flat Crown Staple DimensionsFIG. 2 Cylindrical bea
18、ring point spacingFIG. 3 Load- Deflection CurveF3359 1826. Apparatus6.1 Testing MachineAny suitable testing machine capableof operation at a constant rate of motion of its movable head.6.2 Cylindrical Bearing PointsAny cylindrical metalmembers with a diameter of 0.375 in., capable of supportingthe t
19、est specimen during loading without being deformed, asshown in Fig. 2.6.2.1 Cylindrical bearing points shall allow free rotation asthe test specimen is deformed.6.3 Cylindrical Load PointAny cylindrical metal memberwith a diameter of 0.375 in. capable of loading the testspecimen without being deform
20、ed, as shown in Fig. 2.6.4 InstrumentationLoad and deflection shall be continu-ously measured and recorded.6.4.1 Deflection shall be measured with a transducer havingat least a sensitivity of 0.001 in.6.4.2 Load shall be measured with a sensor having anaccuracy of 6 1 % when calibrated in accordance
21、 with PracticeE4.7. Sampling, Test Specimens, and Test Units7.1 Test specimens shall be randomly selected to representthe parent population of staples from the manufacturingprocess. A minimum of 15 specimens shall be tested for eachunique set of cross-sectional dimensions, as show in Fig. 1.7.2 All
22、testing shall be performed prior to the application ofor after the removal of any coatings or finish.7.3 Prior to placing a specimen in the test apparatus,dimensions of crown width (C), thickness (T), leg length (L)and leg width (W) shall be taken and recorded. Width andthickness measurements shall
23、be taken at the load point on thestaple leg.8. Procedure8.1 Test Setup:8.1.1 The test setup is shown in Fig. 2. Test Span (Sbp) shallbe 1 in.8.1.2 Place the staple leg on the circular supports. The loadshall be applied to the test specimen across the width of thestaple leg. The center of the cylindr
24、ical load point shall beequidistant from the center of each cylindrical bearing points(Sbp/2) as shown in Fig. 2 and located within 0.01 in. from themidpoint of the leg length (L)/2).8.1.3 ExceptionOnly when the design of the test apparatusinterferes with and prevents an intact staple from beingprop
25、erly mounted on the support bearings, then a leg from eachspecimen shall be permitted to be cut off of a staple or bent outof the way and used in the test. The leg shall be removed orbent immediately below the crown and shall not be distorted oraltered in the process. This shall be noted in the test
26、 report.8.1.4 The thickness measurement (T) of the staple leg shallbe used in determining the 5% offset on the load-deflectiondiagram.8.2 Loading:8.2.1 The maximum constant rate of loading shall be 0.25in./min.8.2.2 The procedures described herein are for static loading.Procedures to evaluate staple
27、s subjected to impact or cyclicloads are not a part of this test method.8.3 Load and Deflection MeasurementMeasure the ap-plied load on and deflection of the test specimen from theinitiation of load application taking continuous readings topermit establishment of a satisfactory load-deflection curve
28、.Continue loading until the maximum load is reached and theload begins to decrease.9. Calculation or Interpretation of Results9.1 The yield load, (P), is determined by fitting a straightline to the initial linear portion of the load-deflection curve,offsetting this line by a deflection equal to 5 %
29、of the staple legthickness (T) and selecting the load at which the offset lineintersects the load-deflection curve as shown in Fig. 3. In thosecases where the offset line does not intersect the load-deflectioncurve, the maximum load shall be used as the yield load. Thebending yield moment shall be b
30、ased on the average yield loadfor all of the specimens tested.9.2 The bending yield moment (in-lbs) shall be determinedby the following:My5 P Sbp4 (1)10. Report10.1 The following shall be included in the report:10.1.1 Tabulated and plotted data on load-deflection dia-grams as shown in Fig. 3.10.1.2
31、Physical description of the test specimens includingnominal diameter, crown (C), width (W), leg length (L) andthickness (T).10.1.3 Span Length,10.1.4 Rate of loading, and10.1.5 Number of replicate tests.10.1.6 Individual and average values of the following:10.1.6.1 Calculated yield load (P), and10.1
32、.6.2 Calculated bending yield moment (My)11. Precision and Bias11.1 The precision and bias of this test method has not beendetermined12. Keywords12.1 bending yield moment; staple; yield theoryF3359 183ASTM International takes no position respecting the validity of any patent rights asserted in conne
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