aperfocusesonprestressedmemberswitheitherCFRPorAFRPtendons.Creepandshrinkageofconcrete,andrelaxationofprestressingtendons,causelong-termdeformationsinconcretestructures.Whileitisgenerallyacceptedthatlong-termlossesdonotaffecttheultimatecapacityofaprestressedconcretemember,areasonablyaccuratepredictionoftheselossesisimportanttoensuresatisfactoryperformanceofconcretestructuresinservice.Ifprestresslossesareunderestimated,thetensilestrengthofconcretecanbeexceededunderfullserviceloads,causingcrackingandunexpectedexcessivedeflection.Ontheotherhand,overestimatingprestresslossescanleadtoexcessivecamberanduneconomicdesign.Theerrorinpredictingthelong-termprestresslossescanbedueto:()inaccuracyinestimationofthelong-termmaterialcharacteristics(creepandshrinkageofconcreteandrelaxationofprestressingtendons);and()inaccuracyofthemethodofanalysisused.Theobjectiveofthispaperistoaddressthesecondsourceofinacc钢筋中应变随时间变化能按()式计算。
&