1、Designation: A1044/A1044M 15A1044/A1044M 16Standard 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 r
2、evision, 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 shear reinforcement of concrete. Stud assemb
3、lies consist of eithersingle-headed studs attached to a steel base rail by welding, or double-headed studs mechanically crimped into a steel shape.NOTE 1The configuration of the studs for stud assemblies is much different than the configuration of the headed-type studs prescribed in Section 7,Figure
4、 7.1 of AWS D1.1/D1.1M. Ratios of the cross-sectional areas of the head-to-shank of the AWS D1.1/D1.1M studs range from about 2.5 to 4. Incontrast, this specification requires the area of the head of the studs for stud assemblies to be at least 10 times the area of the shank. Thus, the standardheade
5、d-type studs in Section 7, Figure 7.1 of AWS D1.1/D1.1M do not conform to the requirements of this specification for use as stud assemblies forshear reinforcement.1.2 This specification is applicable for orders in either inch-pound units or in SI units.1.3 The values stated either in inch-pound or S
6、I units are to be regarded as standard. Within the text, the SI units are shownin brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of theother. Combining values from the two systems may result in nonconformance with this specific
7、ation.2. Referenced Documents2.1 ASTM Standards:2A29/A29M Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-WroughtA36/A36M Specification for Carbon Structural SteelA370 Test Methods and Definitions for Mechanical Testing of Steel Products2.2 AWS Standard:3AWS D1.1/D1.1M-2
8、004 Structural Welding CodeSteel2.3 U.S. Military Standards:4MIL-STD-129 Marking for Shipment and StorageMIL-STD-163 Steel Mill Products Preparation for Shipment and Storage2.4 U.S. Federal Standard:4Fed. Std. No. 123 Marking for Shipment (Civil Agencies)3. Terminology3.1 Definitions of Terms Specif
9、ic to This Standard:3.1.1 headed stud, na steel bar used in the reinforcement of concrete that has a head formed at one or both ends.3.1.2 base rail, nthe steel shape or plate that a group of headed studs is attached to by welding or other means.3.1.2.1 DiscussionStud assemblies comprised of single-
10、headed studs require a base rail; the base rail acts as a structural element to provide anchorageto the concrete. For stud assemblies in which double-headed studs are mechanically crimped into a base rail, for example, into a1 This specification is under the jurisdiction ofASTM Committee A01 on Stee
11、l, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.05on Steel Reinforcement.Current edition approved March 1, 2015Jan. 15, 2016. Published March 2015January 2016. Originally approved in 2005. Last previous edition approved in 20102015 asA1044/A1044M 05 (2010).A
12、1044/A1044M 15. DOI: 10.1520/A1044_A1044M-15.10.1520/A1044_A1044M-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM
13、website.3 Available from American Welding Society (AWS), 8669 NW 36 Street, #130, Miami, FL 33166-6672, http:/www.aws.org.4 Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/dodssp.daps.dla.mil.This document is not a
14、n ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate.
15、In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*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 States1steel
16、 channel, the base rail is not required to provide anchorage to the concrete; the purpose of the base rail is to hold the studsin the appropriate location, direction, and spacing until the concrete is cast.4. Ordering Information4.1 It shall be the responsibility of the purchaser to specify all requ
17、irements that are necessary for material ordered to thisspecification. Such requirements shall include but are not limited to the following:4.1.1 Name of product: stud assemblies for shear reinforcement of concrete,4.1.2 Quantity of studs by diameter,4.1.3 Number of heads per stud,4.1.4 Dimensions o
18、f base rail, if included,4.1.5 Overall height of stud assembly,4.1.6 Number of studs per each assembly and their spacing (see Note 2),4.1.7 Requirements for inspection (11.1),4.1.8 Packaging, and4.1.9 ASTM designation and year of issue.NOTE 2In the case of ordering studs rather than assemblies, the
19、length of 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 conforming to Specification A29/A29M, Grades 1010 through 1020. Thestud material shall conform to the requirements fo
20、r tensile properties prescribed in Table 1.5.2 Base Rails:5.2.1 For stud assemblies in which the studs are welded to a base rail, the base rail material shall conform to 5.2.1.1, 5.2.1.2,or 5.2.1.3.5.2.1.1 The base rail material, except for tensile properties, shall conform to Specification A36/A36M
21、 or equivalent. The baserail material shall conform to the requirements for tensile properties prescribed in Table 2.5.2.1.2 Base rail material conforming to the minimum required tensile properties in Specification A36/A36M shall be permittedprovided the base rail thickness is increased by a factor
22、equal to the minimum yield strength specified in Table 2 divided by theminimum yield strength required by Specification A36/A36M.5.2.1.3 Base rail material selected by the manufacturer shall be permitted subject to agreement with the purchaser. Themanufacturer shall furnish documentation to the purc
23、haser in the form of test reports that confirms the suitability of the selectedbase rail material for: (1) manufacturing stud assemblies; and (2) structural adequacy of the stud assemblies for the intendedapplication.5.2.2 For stud assemblies in which double-headed studs are mechanically crimped int
24、o a steel shape, the steel shape shall besufficiently stiff to hold the studs in appropriate location, direction, and spacing.5.3 For stud assemblies in which the studs are attached to base rails by stud welding, the stud welding shall conform to AWSD1.1/D1.1M, including the provisions for productio
25、n control, and fabrication and verification requirements.5.4 Dimensions:5.4.1 Minimum dimensions of headed studs and plate base rails 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 thickness shall be permitted
26、, provided they meet the tensile requirements ofthis specification.6. Tensile Tests6.1 At periodic intervals, tensile tests of the headed stud with a single or double head formed at one or both ends of the shankor welded to the base rail shall be performed as specified in the quality assurance progr
27、am of the manufacturer and agreed uponby the purchaser. Tensile tests on the studs shall be conducted by the assembly manufacturer, or an inspection agency, or the studsupplier.6.2 Tensile testing shall be performed in accordance with the requirements described in Test Methods and Definitions A370.T
28、ensile testing of headed studs shall be performed using a test fixture as described in Section 7.3.2 of AWS D1.1/D1.1M.TABLE 1 Tensile RequirementsStud MaterialTensile strength, min, psi MPa 65 000 450Yield strength, min, psi MPa 51 000 350Elongation in 2 in. 50 mm, min, % 20Reduction of area, min,
29、% 50A1044/A1044M 1627. Acceptance Criteria7.1 In addition to meeting the strength requirements of 5.1 and 5.2, no observed partial or total fracture of the head, the studweld, or other stud-base rail connection shall be permitted.The failure shall occur either in the stud material a minimum of one-h
30、alfshank diameter from the head-to-shank or stud-to-base rail connection, or by tearing a hole in the base rail. Failure of the heador stud-to-base rail connection within the attachment region shall be cause for rejection. The tensile force at which failure occursshall exceed the minimum yield stren
31、gth of the stud.8. Number of Tests8.1 Aminimum of two tensile tests shall be conducted during a production shift or period. It shall be permissible to test separatebase rail material of the same thickness, chemical composition, and configuration of the base rails used in production. One test atthe s
32、tart and one test at the end of each 8-h production shift or less than 8-h production period, or at random intervals during theproduction period, shall be conducted.8.2 In the event different heats of stud or base rail material within the same material specification are used to produce studassemblie
33、s during a production run, a minimum of two tensile tests in accordance with Section 6 shall be conducted to verify theproduction method, product quality, and weldability of the heats of materials prior to continuing production.8.3 Any identified procedural or performance deficiencies shall be corre
34、cted and testing repeated until the tensile test resultsmeet the requirements of this specification.9. Retests9.1 If the tension test fails before meeting the specified minimum yield strength of the headed stud material in accordance withTable 1, but is within 2000 psi 14 MPa of the required tensile
35、 strength, and if the fracture is not located within one-half shankdiameter from the head-to-shank or stud-to-base rail connection, then a retest shall be allowed. Two specimens taken at randomfrom the production lot shall be tested during a retest. Both assembled specimens shall pass the minimum yi
36、eld strengthrequirements of Section 6 or the lot shall be rejected.9.2 If any test specimen fails because of mechanical reasons such as failure of the testing equipment or from flaws caused byspecimen preparation, shipment or other damage unrelated to fabrication or testing, it shall be discarded an
37、d another specimen fromthe same production lot substituted.10. Finish10.1 Finished studs shall be of uniform quality and condition, free of discontinuous laps, seams, fins, or other discontinuitiesthat would adversely affect welding or structural strength of the studs. Radial cracks or bursts in the
38、 head(s) of the studs shall notbe cause for rejection provided that the length of cracks or bursts do not exceed the value 0.25 times (head diameter shankdiameter), or using the notation in Fig. 1: 0.25 (D d ). Surface rust and mill scale shall not be cause for rejection provided theydo not adversel
39、y affect welding or structural strength of the stud assembly.NOTE 4Heads of studs are subject to cracks or bursts, which are terms for 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
40、 representing the purchaser shall have free entry while work on the contract of the purchaser is beingperformed, to the parts of the manufacturers facilities that concern manufacture of the material ordered. The manufacturer shallafford the inspector reasonable access to the facilities to satisfy th
41、e inspector that the materials and procedures are in accordancewith this specification. Inspection at the place of manufacture shall be conducted so as not to interfere unnecessarily with theoperation of the manufacturers facilities.11.1 For Government Procurement OnlyExcept as otherwise specified i
42、n the contract, the manufacturer shall be responsiblefor the performance of inspection and test requirements specified herein, unless otherwise agreed by the purchaser at the time ofpurchase, and shall use his/her own or other suitable facilities for the performance of the inspection and test requir
43、ements specifiedherein.Inspection of the stud assemblies shall be agreed upon between the purchaser and the manufacturer as part of the purchaseorder or contract.TABLE 2 Tensile RequirementsBase Rail MaterialATensile strength, min, psi MPa 65 000 450Yield strength, min, psi MPa 44 000 300Elongation
44、in 8 in. 200 mm, min, % 20A Studs welded to base rail.A1044/A1044M 16312. Rejection12.1 The purchaser shall have the right to perform any of the inspections and tests as set forth in this specification as deemednecessary. Unless otherwise specified, any rejection based on tests made in accordance wi
45、th this specification shall be reported tothe manufacturer within five working days from the receipt of samples by the purchaser.12.2 Material which does not meet the requirements of this specification subsequent to its acceptance at the manufacturersfacilities shall be subject to rejection, and the
46、 manufacturer shall be promptly notified.TABLE 3 Minimum DimensionsHeaded Studs and Base RailsStud Shank Stud Head Base RailADiameter (d),in. mmBDiameter (D),in. mmCThickness (th),in. mmRadius at Connectionof Stud Shankwith Stud Head,in. mmWidth (b),in. mmThickness (tp),in. mm0.375 9.5 1.19 30.1 0.2
47、1 5.3 0.25 6.4 1.00 25.4 316 4.80.500 12.7 1.58 40.2 0.28 7.1 0.25 6.4 1.25 31.8 14 6.50.625 15.9 1.98 50.2 0.35 8.9 0.25 6.4 1.75 44.5 516 7.90.750 19.1 2.37 60.2 0.42 10.7 0.375 9.5 2.00 50.8 38 9.5A Length of base rail specified by purchaser.B Tolerance: 0.010 in. 0.25 mm.C Tolerance: 0.015 in. 0
48、.38 mm.FIG. 1 Stud Assemblies: (a) Single-Headed Studs Welded to a Base Rail; (b) Double-Headed Studs Crimped into a Steel Channel; (c)Detail of Connection of Stud Shank with Stud HeadA1044/A1044M 16413. Rehearing13.1 Samples tested in accordance with this specification which represent rejected mate
49、rial shall be preserved for two weeksfrom the date rejection is reported to the manufacturer. In case of dissatisfaction with the results of the test, the manufacturer shallmake claim for a rehearing within that time.14. Certification and Test Reports14.1 A manufacturers product certificate shall accompany stud assemblies when they are shipped from the manufacturersfacilities to the purchaser.The certificate shall include a statement of compliance to this spec
