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Q345李国强陈凯蒋首超殷颖智(200092)[]Q345:,[]ExperimentalstudiesonthehightemperaturematerialpropertiesofQ345steelwhichiswidelyusedinsteelstructuresarecarriedout.Thetestdataincludestressstraincurve,yieldstrength,tensilestrength,modulusofelasticityandelongation.Basedonthedataofthetests,themathematicalmodelforpredictingthepropertiesofQ345steelatelevatedtemperaturesispresented.Inaddition,acomparisonbetweenthehightemperaturemodelforQ345steelproposedandthemodelsforgeneralsteelproposedinthecodesofseveralothercountrieshasbeenmade.Keywords:hightemperature;experiment;materialproperty;materialmodel,ECCS,,,[6,7],Q235,1(1)Q345;(2)Q345,;(3)Q3452()AUTOGRAPHICS2550kN,,1200,,,,1Q345SM41,!(GB4338∀84)!(GB228∀87)A,B(1)AQ345(26),100,150,200,225,250,275,300,350,400,450,500,550,600,650,70016225,250,300,:,,451(:mm)(2)BQ34507fy,08fy,09fy,fyQ345,,,5331120011,5~10/min,,1,:,1)250,2)275~300,,3)350,,4)400,,5)450~500,,,6)550~700,,,()2(1)AA(2~4):,Q345,25200:;,10%;,20%;,25%,200~300,#∃,:;,,3007%;,:;700,20%,543%,,,,;,,,,(2)B,,07fy,08fy,09fy(1),fyQ345,fy=449.4MPa,,,,2,,;,,Q3451(MPa)()10.7fy56020.8fy51030.9fy500(mm)2()3504004504704905005105205405505600.7fy0.350.753.45.5510*0.8fy1.351.452.111.45*0.9fy1.812.453.24.78.9**,BA,B,09fy(404.5MPa)500,08fy(3595MPa)510,07fy(3146MPa)560A5003473MPa,5103323MPa,5602602MPa,B,34254,B,,,,,,,,,(1)fyT/fy=-3%10-9T3+2%10-6T2-00013T+10413(1):fyTTQ345(02%),MPa;fyQ345(02%),MPa;T,(2)fuT/fu=4%10-11T4-5%10-8T3+2%10-5T2-0.0034T+1.0855(2):fuTTQ345,MPa;fuQ345,MPa(3)ET/E=-3%10-9T3+7%10-7T2-1%10-4T+1(3):ETTQ345,MPa;EQ345,MPa(4)uT/u=7%10-14T5-1%10-10T4+6%10-8T3-1%10-5T2+0.0004T+0.2476(4):uTTQ345;uQ34567,8,,,,,,,56781,,1996,11(2)2,,,19993ECCS.Europeanrecommendationsforthefiresafetyofsteelstructures.1983.4BSI.Structuraluseofsteelworkinbuilding,Part8CodeofPracticeforFireResistanceDesign.1990.5CEN(EuropeanCommitteeforStandardization).DAFTENV1993,Eurocode3:DesignofSteelStructures,July,1995.6,,19967,,198955