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1、英文原文SteelBridgesforthe21stCenturyJohnM.Kulicki,Ph.D.,P.E.,ModjeskiandMasters,Inc.AcollaborativeeffortoftheFederalHighwayAdministration(FHWA),theUnitedStatesNavy,andtheAmericanIronandSteelInstitute(AISI)hasresultedinthedevelopmentofnewsteelwithgreatpotentialforuseinh
2、ighwaybridgeconstruction.Enhancedperformancesteel,alsoknownashigh-performancesteel(HPS),maybedefinedasanysteelwithsomepropertiesimprovedoverexistingASTMA709,Grades345W,485Wor690W,suchas:·Originally,atleast485MPayield,althoughotherstrengthsupto985MPaareunderconsidera
3、tion.TherehasalsobeensomediscussionregardingthedesirabilityofalowerstrengthHPS,e.g.,HPS345W.Bridgesteelswithyieldstrengthsof345,485and690MPahavebeenavailablefordecadessoitisclearthatstrengthalonedoesnotmakea“highperformance”steel;·Improvedtoughnessforpracticalbridge
4、environments,usuallyexpressedasmeeting“Zone3"requirements,i.e.,47Joulesat-23°C;·Increasedweldability,oftendescribedintermsofreducedpreheatandinterpasstemperaturerequirements;·Nodetrimentalchangestootherimportantproperties;·WeatheringpropertiesatleastequaltotheolderG
5、rade485W.Statedmoresimply,HPShasimprovementsinoneormoreofthefollowingproperties:strength,weldability,ductility,corrosionresistance,fatigueresistance,fracturetoughness,fabricability,orformability.TheHPScurrentlyavailablehasayieldstrengthof485MPaandisproducedthroughim
6、provementsinbothchemistryandcontrolofthecoolingprocess.TheFHWArecognizedthatresearchwasnecessarytoconsiderstructuralformswhichcouldcapitalizeontheimprovementsandpropertiesanticipatedasthenewHPSwasbeingdeveloped,andtoidentifydesignandspecificationissueswhichwouldhave
7、tobeaddressedtoutilizethenewmaterial.Whilethecurrentmaterialhasayieldpointof485MPa,considerationwasgiventosteelswithyieldpointsashighas985MPa.Ifstrengthsofthislevelaredevelopedinthefuture,newinnovativestructuralsystemswouldbeneededtoutilizethefullpotentialoftheimpro
8、vedpropertiesofsuchsteels.AreportonanFHWA-sponsoredresearchprojecttoevaluatepotentialnewstructuralformsandtodeterminetheirweight-basedeffi
