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ASTM A1044 - A 1044M - 15.pdf

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ASTM A1044 - A 1044M - 15.pdf

Designation A1044/A1044M − 15Standard Specification forSteel Stud Assemblies for Shear Reinforcement ofConcrete1This standard is issued under the fixed designation A1044/A1044M; 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. Scope*1.1 This specification covers steel stud assemblies for shearreinforcement of concrete. Stud assemblies consist of eithersingle-headed studs attached to a steel base rail by welding, ordouble-headed studs mechanically crimped into a steel shape.NOTE 1The configuration of the studs for stud assemblies is muchdifferent than the configuration of the headed-type studs prescribed inSection 7, Figure 7.1 of AWS D1.1/D1.1M. Ratios of the cross-sectionalareas of the head-to-shank of the AWS D1.1/D1.1M studs range fromabout 2.5 to 4. In contrast, this specification requires the area of the headof the studs for stud assemblies to be at least 10 times the area of theshank. Thus, the standard headed-type studs in Section 7, Figure 7.1 ofAWS D1.1/D1.1M do not conform to the requirements of this specifica-tion for use as stud assemblies for shear reinforcement.1.2 This specification is applicable for orders in eitherinch-pound units or in SI units.1.3 The values stated either in inch-pound or SI units are tobe regarded as standard. Within the text, the SI units are shownin brackets. The values stated in each system are not exactequivalents; therefore, each system must be used indepen-dently of the other. Combining values from the two systemsmay result in nonconformance with this specification.2. Referenced Documents2.1 ASTM Standards2A29/A29M Specification for General Requirements for SteelBars, Carbon and Alloy, Hot-WroughtA36/A36M Specification for Carbon Structural SteelA370 Test Methods and Definitions for Mechanical Testingof Steel Products2.2 AWS Standard3AWS D1.1/D1.1M-2004 Structural Welding CodeSteel2.3 U.S. Military Standards4MIL-STD-129 Marking for Shipment and StorageMIL-STD-163 Steel Mill Products Preparation for Shipmentand Storage2.4 U.S. Federal Standard4Fed. Std. No. 123 Marking for Shipment Civil Agencies3. Terminology3.1 Definitions of Terms Specific to This Standard3.1.1 headed stud, na steel bar used in the reinforcementof concrete that has a head formed at one or both ends.3.1.2 base rail, nthe steel shape or plate that a group ofheaded studs is attached to by welding or other means.3.1.2.1 DiscussionStud assemblies comprised of single-headed studs require a base rail; the base rail acts as a structuralelement to provide anchorage to the concrete. For stud assem-blies in which double-headed studs are mechanically crimpedinto a base rail, for example, into a steel channel, the base railis not required to provide anchorage to the concrete; thepurpose of the base rail is to hold the studs in the appropriatelocation, direction, and spacing until the concrete is cast.4. Ordering Information4.1 It shall be the responsibility of the purchaser to specifyall requirements that are necessary for material ordered to thisspecification. Such requirements shall include but are notlimited to the following4.1.1 Name of product stud assemblies for shear reinforce-ment of concrete,4.1.2 Quantity of studs by diameter,4.1.3 Number of heads per stud,4.1.4 Dimensions of base rail, if included,4.1.5 Overall height of stud assembly,4.1.6 Number of studs per each assembly and their spacingsee Note 2,4.1.7 Packaging, and4.1.8 ASTM designation and year of issue.NOTE 2In the case of ordering studs rather than assemblies, the length1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.05 on Steel Reinforcement.Current edition approved March 1, 2015. Published March 2015. Originallyapproved in 2005. Last previous edition approved in 2010 as A1044/A1044M – 052010. DOI 10.1520/A1044_A1044M-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 standard’s Document Summary page onthe ASTM website.3Available from American Welding Society AWS, 8669 NW 36 Street, 130,Miami, FL 33166-6672, http//www.aws.org.4Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http//dodssp.daps.dla.mil.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1of the studs should be specified such that the appropriate height of the studassembly is achieved.5. Materials and Manufacture5.1 Headed studs shall be manufactured from steel conform-ing to Specification A29/A29M, Grades 1010 through 1020.The stud material shall conform to the requirements for tensileproperties prescribed in Table 1.5.2 Base Rails5.2.1 For stud assemblies in which the studs are welded toa base rail, the base rail material shall conform to 5.2.1.1,5.2.1.2,or5.2.1.3.5.2.1.1 The base rail material, except for tensile properties,shall conform to Specification A36/A36M or equivalent. Thebase rail material shall conform to the requirements for tensileproperties prescribed in Table 2.5.2.1.2 Base rail material conforming to the minimumrequired tensile properties in Specification A36/A36M shall bepermitted provided the base rail thickness is increased by afactor equal to the minimum yield strength specified in Table 2divided by the minimum yield strength required by Specifica-tion A36/A36M.5.2.1.3 Base rail material selected by the manufacturer shallbe permitted subject to agreement with the purchaser. Themanufacturer shall furnish documentation to the purchaser inthe form of test reports that confirms the suitability of theselected base rail material for 1 manufacturing stud assem-blies; and 2 structural adequacy of the stud assemblies for theintended application.5.2.2 For stud assemblies in which double-headed studs aremechanically crimped into a steel shape, the steel shape shallbe sufficiently stiff to hold the studs in appropriate location,direction, and spacing.5.3 For stud assemblies in which the studs are attached tobase rails by stud welding, the stud welding shall conform toAWS D1.1/D1.1M, including the provisions for productioncontrol, and fabrication and verification requirements.5.4 Dimensions5.4.1 Minimum dimensions of headed studs and plate baserails shall conform to Table 3.NOTE 3The configurations of stud assemblies are shown in Fig. 1.5.4.2 Headed studs with heads that have variable thicknessshall be permitted, provided they meet the tensile requirementsof this specification.6. Tensile Tests6.1 At periodic intervals, tensile tests of the headed studwith a single or double head formed at one or both ends of theshank or welded to the base rail shall be performed as specifiedin the quality assurance program of the manufacturer andagreed upon by the purchaser. Tensile tests on the studs shall beconducted by the assembly manufacturer, or an inspectionagency, or the stud supplier.6.2 Tensile testing shall be performed in accordance withthe requirements described in Test Methods and DefinitionsA370. Tensile testing of headed studs shall be performed usinga test fixture as described in Section 7.3.2 of AWS D1.1/D1.1M.7. Acceptance Criteria7.1 In addition to meeting the strength requirements of 5.1and 5.2, no observed partial or total fracture of the head, thestud weld, or other stud-base rail connection shall be permitted.The failure shall occur either in the stud material a minimum ofone-half shank diameter from the head-to-shank or stud-to-base rail connection, or by tearing a hole in the base rail.Failure of the head or stud-to-base rail connection within theattachment region shall be cause for rejection. The tensile forceat which failure occurs shall exceed the minimum yieldstrength of the stud.8. Number of Tests8.1 A minimum of two tensile tests shall be conductedduring a production shift or period. It shall be permissible totest separate base rail material of the same thickness, chemicalcomposition, and configuration of the base rails used inproduction. One test at the start and one test at the end of each8-h production shift or less than 8-h production period, or atrandom intervals during the production period, shall be con-ducted.8.2 In the event different heats of stud or base rail materialwithin the same material specification are used to produce studassemblies during a production run, a minimum of two tensiletests in accordance with Section 6 shall be conducted to verifythe production method, product quality, and weldability of theheats of materials prior to continuing production.8.3 Any identified procedural or performance deficienciesshall be corrected and testing repeated until the tensile testresults meet the requirements of this specification.9. Retests9.1 If the tension test fails before meeting the specifiedminimum yield strength of the headed stud material in accor-dance with Table 1, but is within 2000 psi [14 MPa] of therequired tensile strength, and if the fracture is not locatedwithin one-half shank diameter from the head-to-shank orstud-to-base rail connection, then a retest shall be allowed.Twospecimens taken at random from the production lot shall betested during a retest. Both assembled specimens shall pass theminimum yield strength requirements of Section 6 or the lotshall be rejected.TABLE 1 Tensile RequirementsStud MaterialTensile strength, min, psi [MPa] 65 000 [450]Yield strength, min, psi [MPa] 51 000 [350]Elongation in 2 in. [50 mm], min, 20Reduction of area, min, 50TABLE 2 Tensile RequirementsBase Rail MaterialATensile strength, min, psi [MPa] 65 000 [450]Yield strength, min, psi [MPa] 44 000 [300]Elongation in 8 in. [200 mm], min, 20AStuds welded to base rail.A1044/A1044M − 1529.2 If any test specimen fails because of mechanical reasonssuch as failure of the testing equipment or from flaws causedby specimen preparation, shipment or other damage unrelatedto fabrication or testing, it shall be discarded and anotherspecimen from the same production lot substituted.10. Finish10.1 Finished studs shall be of uniform quality andcondition, free of discontinuous laps, seams, fins, or otherdiscontinuities that would adversely affect welding or struc-tural strength of the studs. Radial cracks or bursts in the headsof the studs shall not be cause for rejection provided that thelength of cracks or bursts do not exceed the value 0.25 timeshead diameter − shank diameter, or using the notation in Fig.1 0.25 D − d . Surface rust and mill scale shall not be causefor rejection provided they do not adversely affect welding orstructural strength of the stud assembly.NOTE 4Heads of studs are subject to cracks or bursts, which are termsTABLE 3 Minimum DimensionsHeaded Studs and Base RailsStud Shank Stud Head Base RailADiameter d,in. [mm]BDiameter D,in. [mm]CThickness th,in. [mm]Radius at Connectionof Stud Shankwith Stud Head,in. [mm]Width b,in. [mm]Thickness tp,in. [mm]0.375 [9.5] 1.19 [30.1] 0.21 [5.3] 0.25 [6.4] 1.00 [25.4]3⁄16 [4.8]0.500 [12.7] 1.58 [40.2] 0.28 [7.1] 0.25 [6.4] 1.25 [31.8]1⁄4 [6.5]0.625 [15.9] 1.98 [50.2] 0.35 [8.9] 0.25 [6.4] 1.75 [44.5]5⁄16 [7.9]0.750 [19.1] 2.37 [60.2] 0.42 [10.7] 0.375 [9.5] 2.00 [50.8]3⁄8 [9.5]ALength of base rail specified by purchaser.BTolerance −0.010 in. [−0.25 mm].CTolerance −0.015 in. [−0.38 mm].FIG. 1 Stud Assemblies a Single-Headed Studs Welded to a Base Rail; b Double-Headed Studs Crimped into a Steel Channel; cDetail of Connection of Stud Shank with Stud HeadA1044/A1044M − 153for the same thing. Cracks or bursts designate an abrupt interruption of theperiphery of the stud head by radial separation of the metal.11. Inspection11.1 The inspector representing the purchaser shall havefree entry while work on the contract of the purchaser is beingperformed, to the parts of the manufacturer’s facilities thatconcern manufacture of the material ordered. The manufac-turer shall afford the inspector reasonable access to the facili-ties to satisfy the inspector that the materials and proceduresare in accordance with this specification. Inspection at theplace of manufacture shall be conducted so as not to interfereunnecessarily with the operation of the manufacturer’s facili-ties.11.2 For Government Procurement OnlyExcept as other-wise specified in the contract, the manufacturer shall beresponsible for the performance of inspection and test require-ments specified herein, unless otherwise agreed by the pur-chaser at the time of purchase, and shall use his/her own orother suitable facilities for the performance of the inspectionand test requirements specified herein.12. Rejection12.1 The purchaser shall have the right to perform any ofthe inspections and tests as set forth in this specification asdeemed necessary. Unless otherwise specified, any rejectionbased on tests made in accordance with this specification shallbe reported to the manufacturer within five working days fromthe receipt of samples by the purchaser.12.2 Material which does not meet the requirements of thisspecification subsequent to its acceptance at the manufacturer’sfacilities shall be subject to rejection, and the manufacturershall be promptly notified.13. Rehearing13.1 Samples tested in accordance with this specificationwhich represent rejected material shall be preserved for twoweeks from the date rejection is reported to the manufacturer.In case of dissatisfaction with the results of the test, themanufacturer shall make claim for a rehearing within that time.14. Certification and Test Reports14.1 A manufacturer’s product certificate shall accompanystud assemblies when they are shipped from the manufacturer’sfacilities to the purchaser. The certificate shall include astatement of compliance to this specification, copies of testreports required by 14.2 and 14.3, and a statement of compli-ance with AWS D1.1/D1.1M in the case of stud-welded rails.14.2 A certified mill test report shall be furnished by themanufacturer containing, on a per heat basis, the chemicalanalysis of the stud material, as well as the base rail, if present.14.3 A test report shall be required of the manufacturer forthe production of stud assemblies as described in Section 6.Acopy of the test report shall be provided to the purchaser uponrequest.14.4 A Material Test Report, Certificate of Inspection, orsimilar document printed from or used in electronic form froman electronic data interchange EDI transmission shall beregarded as having the same validity as a counterpart printed inthe certifier’s

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