1、Designation:A615/A615M20American Association State Highway andTransportation Officials StandardAASHTO No.:M 31Standard Specification forDeformed and Plain Carbon-Steel Bars for ConcreteReinforcement1This standard is issued under the fixed designation A615/A615M;the number immediately following the d
2、esignation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by a
3、gencies of the U.S.Department of Defense.1.Scope*1.1 This specification covers deformed and plain carbon-steel bars in cut lengths and coils for concrete reinforcement.AnnexA2 of this specification covers deformed bars for use forother applications.Steel bars containing alloy additions,suchas with t
4、he Association for Iron and Steel Technology and theSociety of Automotive Engineers series of alloy steels,arepermitted if the resulting product meets all the other require-ments of this specification.The standard sizes and dimensionsof deformed bars and their number designations are given inTable 1
5、.1.2 Unless specified for use for other applications in AnnexA2,bars are of four minimum yield strength levels:namely,40 000 psi 280 MPa,60 000 psi 420 MPa,80 000 psi 550MPa,and 100 000 psi 690 MPa,designated as Grade 40280,Grade 60 420,Grade 80 550,and Grade 100 690,respectively.NOTE1Grade 100 690
6、reinforcing bars were introduced in thisspecification in 2015.In contrast to the lower grades,which have ratios ofspecified tensile strength to specified yield strength that range from 1.25to 1.50,Grade 100 690 reinforcing bars have a ratio of specified tensilestrength to specified yield strength of
7、 1.15.Users of this specificationshould be aware that there will,therefore,be a lower margin of safety andreduced warning of failure following yielding when Grade 100 690 barsare used in structural members where strength is governed by the tensilestrength of the reinforcement,primarily in beams and
8、slabs.As a result ofthe lower specified tensile strength to specified yield strength ratio of 1.15for Grade 100 690,users of this specification should be aware that ACI318 Type 1 mechanical and welded splice requirements found in manyacceptance criteria of 125%of specified yield strength requirement
9、s intension and compression are not applicable to Grade 100 690.Mechani-cal and welded splices should meet a minimum specified tensile strengthof 115 000 psi 790 MPa for Grade 100 690.NOTE2Users of this specification need to be aware that consensusdesign codes and specifications may not recognize th
10、e use of the No.2064 bar,the largest bar included in this specification.Structural membersreinforced with No.20 64 bars may require approval of the buildingofficial or other appropriate authority and require special detailing toensure adequate performance at service and factored loads.1.3 Plain bars
11、,in sizes up to and including 212in.63.5 mmin diameter in coils or cut lengths,when ordered shall befurnished under this specification in Grade 40 280,Grade 60420,Grade 80 550,and Grade 100 690.For ductilityproperties(elongation and bending),test provisions of thenearest smaller nominal diameter def
12、ormed bar size shallapply.Requirements providing for deformations and markingshall not be applicable.NOTE3Welding of the material in this specification should beapproached with caution since no specific provisions have been includedto enhance its weldability.When this steel is to be welded,a welding
13、procedure suitable for the chemical composition and intended use orservice should be used.The use of the latest edition of AWS D1.4 D1.4Mis recommended.The AWS D1.4 D1.4M Welding Code describes theproper selection of the filler metals and preheat/interpass temperatures,aswell as performance and proc
14、edure qualification requirements.1.4 Requirements for alternate bar sizes are presented inAnnex A1.The requirements in Annex A1 only apply whenspecified by the purchaser(see 4.2.4).1.5 The text of this specification references notes andfootnotes which provide explanatory material.These notes andfoot
15、notes(excluding those in tables)shall not be considered asrequirements of the specification.1.6 This specification is applicable for orders in eitherinch-pound units(as Specification A615)or in SI units(asSpecification A615M).1.7 The values stated in either inch-pound units or SI unitsare to be rega
16、rded separately as standard.Within the text,theSI units are shown in brackets.The values stated in eachsystem may not be exact equivalents;therefore,each systemshall be used independently of the other.Combining valuesfrom the two systems may result in non-conformance with thespecification.1This 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 appr
