1、Designation:A709/A709M16aStandard Specification forStructural Steel for Bridges1This standard is issued under the fixed designation A709/A709M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in pare
2、ntheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers carbon and high-strength low-alloy steel structural shapes,plates,and bars and quenched andtempered alloy steel for structura
3、l plates intended for use inbridges.Seven grades are available in four yield strength levelsas follows:Grade U.S.SIYield Strength,ksi MPa36 25036 25050 34550 34550S 345S50 34550W 345W50 345HPS 50W HPS 345W50 345HPS 70W HPS 485W70 485HPS 100W HPS 690W100 6901.1.1 Grades 36 250,50 345,50S 345S,and 50W
4、345W are also included in Specifications A36/A36M,A572/A572M,A992/A992M,and A588/A588M,respectively.Whenthe requirements of Table 9 or Table 10 or the supplementaryrequirements of this specification are specified,they exceed therequirements of Specifications A36/A36M,A572/A572M,A992/A992M,and A588/A
5、588M.1.1.2 Grades 50W 345W,HPS 50W HPS 345W,HPS70W HPS 485W,and HPS 100W HPS 690W have en-hanced atmospheric corrosion resistance(see 13.1.2).Productavailability is shown in Table 1.1.2 Grade HPS 70W HPS 485W or HPS 100W HPS690W shall not be substituted for Grades 36 250,50 345,50S 345S,50W 345W,or
6、HPS 50W HPS 345W.Grade50W 345W,or HPS 50W HPS 345W shall not be substi-tuted for Grades 36 250,50 345 or 50S 345S withoutagreement between the purchaser and the supplier.1.3 When the steel is to be welded,it is presupposed that awelding procedure suitable for the grade of steel and intendeduse or se
7、rvice will be utilized.See Appendix X3 of Specifica-tion A6/A6M for information on weldability.1.4 For structural products to be used as tension componentsrequiring notch toughness testing,standardized requirementsare provided in this standard,and they are based uponAmerican Association of State Hig
8、hway and TransportationOfficials(AASHTO)requirements for both fracture critical andnon-fracture critical members.1.5 Supplementary requirements are available but shallapply only if specified in the purchase order.1.6 The values stated in either SI units or inch-pound unitsare to be regarded separate
9、ly as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.7 For structural products produced from coil and fur-nished without heat tre
10、atment or with stress relieving only,theadditional requirements,including additional testing require-ments and the reporting of additional test results,of Specifi-cation A6/A6M apply.2.Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for RolledStructural Steel Ba
11、rs,Plates,Shapes,and Sheet PilingA36/A36M Specification for Carbon Structural SteelA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA572/A572M Specification for High-Strength Low-AlloyColumbium-Vanadium Structural SteelA588/A588M Specification for High-Strength Low-AlloyStruc
12、tural Steel,up to 50 ksi 345 MPa Minimum YieldPoint,with Atmospheric Corrosion ResistanceA673/A673M Specification for Sampling Procedure for Im-pact Testing of Structural SteelA992/A992M Specification for Structural Steel ShapesG101 Guide for Estimating the Atmospheric Corrosion Re-sistance of Low-A
13、lloy Steels3.Terminology3.1 Definitions of Terms Specific to This Standard:1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.02 on Structural Steel for Bridges,Buildings,Rolling Stock an
14、d Ships.Current edition approved May 1,2016.Published May 2016.Originallyapproved in 1974.Last previous edition approved in 2016 as A709/A709M 16.DOI:10.1520/A0709_A0709M-16A.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Ann
15、ual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*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 States1 3.1.1 fracture c
16、ritical membera main load-carrying ten-sion member or tension component of a bending memberwhose failure would be expected to cause collapse of astructure or bridge without multiple,redundant load paths.3.1.2 main load-carrying membera steel member de-signed to carry primary design loads,including dead,live,impact,and other loads.3.1.3 non-fracture critical membera main load-carryingmember whose failure would not be expected to cause collapseof a structure or bridge with multiple,redundant load
