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DeformationAnalysisofPrestressedContinuous Steel-ConcreteCompositeBeams JianguoNie1;MuxuanTao2;C.S.Cai3;andShaojingLi4 Abstract:Deformationcalculationofprestressedcontinuoussteel-concretecompositebeamsaccountingfortheslipeffectbetweenthe steelandconcreteinterfaceunderserviceloadsisanalyzed.Asimpli?edanalyticalmodelispresented.Basedonthismodel,formulasfor predictingthecrackingregionofconcreteslabneartheinteriorsupportsandtheincreaseoftheprestressingtendonforcearederived.A table for calculating the midspan de?ection of two-span prestressed continuous composite beams is also proposed. It is found that the internalforceoftheprestressingtendonunderserviceloadscanbeaccuratelycalculatedusingtheproposedformulas.Byignoringthe increaseofthetendonforce,thecalculatedde?ectionareoverestimated,andconsideringtheincreaseofthetendonforcecansigni?cantly improvetheaccuracyofanalyticalpredictions.Asthecalculatedvaluesshowgoodagreementwiththetestresults,theproposedformulas can be reliably applied to the deformation analysis of prestressed continuous composite beams. Finally, based on the formulas for calculating the deformation of two-span prestressed continuous composite beams, a general method for deformation analysis of pre- stressedcontinuouscompositebeamsisproposed. DOI:10.1061/?ASCE?ST.1943-541X.0000067 CEDatabasesubjectheadings:Prestressedconcrete;Compositebeams;Deformation;De?ection;Cracking;Concreteslabs;Con- tinuousbeams. Introduction ?2? increasing the ultimate loading capacity; ?3? decreasing the deformation under service loads; ?4? being favorable in crack- widthcontrol;?5?fullyusingthematerialsandthusreducingthe structural height and overall dead load; and ?6? improving the fatigueandfracturebehavior. Continuous steel-concrete composite beams are widely used in buildingsandbridgesforhigherspan/depthratiosandlessde?ec- tionetc.,whichresultsinsuperioreconomicalperformancecom- pared with simply supported composite beams. For continuous composite beams, negative bending near i