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1、钢筋材料（Reinforcingmaterial）DOCdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.ReinforcementengineeringMaterialScienceVarietiesandspecificationsof9-1-1steelbarsOrdinarysteelbarsusedinconcretestr
2、ucturescanbedividedintotwotypes:hotrolledbarsandcoldworkedbars(coldrolledribbedbars,cold-rolledtwistedbarsandcolddrawnspiralbars).Colddrawnsteelbarsandcolddrawnlowcarbonsteelwirehavebeenphasedout.Thewasteheattreatmentsteelbarbelongstoakindofhotrolledsteelbar.Thestr
3、engthgradeofhotrolledbarischangedfromIclass,IIclass,IIIclassandIVclasstograde235,grade335,grade400andgrade500accordingtoyieldstrength(MPa)."Codefordesignofconcretestructures"(GB50010-2002)theprovisionsofarticle4.2.1:ordinarysteelshouldbeusedhotrolledribbedsteelgrad
4、eHRB400andHRB335,alsocanusehotrolledroundsteelbarHPB235andheattreatmentofsteelgradeRRB400;andshowsintheprovisionofHRB400(i.e.,advocatetheuseofnewIIIgrade)steelasthemainreinforcementofreinforcedconcretestructurecountry.ThedesignspecificationhasnotbeenincludedintheHR
5、B500gradesteelbars.Coldrolledribbedsteelandcold-rolledandtwistedbarsforspecialprocedures"technicalspecificationforreinforcedconcretestructureswithcold-rolledribbed(JGJ95-1995)"and"coldrolledtwistedsteelreinforcedconcretecomponentspecification"(JGJ115-1997)forrefere
6、nce.9-1-1-1hotrolledsteelbarsHotrolledsteelisthefinishedsteelhotrollingandcooling,dividedintohot-rolledroundsteelandhotrolledribbedbartwo.Thehotrolledroundsteelbarsshallcomplywiththenationalstandardof"hotrolledroundsteelbarsforreinforcedconcrete"(GB13013-1991).Hotr
7、olledribbedsteelbarsshouldbeconsistentwithnationalstandards,"thereinforcementofconcretehotrolledribbedbar"(GB1499-1998)regulations.1.dimensions,shapesandweights,diameter,cross-sectionalareaandweightofhot-rolledbars,seetable9-1.Hotrolledribbedbarshape,seefigure9-1.D
8、iameter,crosssectionalareaandweightofhotrolledsteelbarsNominaldiameter(mmdiameter)6(mm)5.8longitudinalandtransverseribto1,H2(mm)0.6Table9-1Theore
