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To enhance the durability of a reinforced concrete structure,engineered cementitious composite (ECC),which exhibits high tensile ductility and good crack control ability,is considered a promising altative to conventional concrete.However,broad application of ECC is hindered by its high cost.This paper presents a new means to address this issue by introducing a composite beam with a U-shaped ECC permanent formwork and infill concrete.The flexural performance of the ECC/RC composite beam has been investigated experimentally with eight specimens.According to the test results,the failure of a composite beam with a U-shaped ECC formwork is initiated by the crushing of compressive concrete rather than debonding,even if the surface between the ECC and the concrete is smooth as-finished.Under the same reinforcement configurations,ECC/RC composite beams exhibit increases in flexural performance in terms of ductility,load-carrying capacity,and damage tolerance compared with the counterpart ordinary RC beam.Furthermore,a theoretical model based on the strip method is proposed to predict the moment-curvature responses of ECC/RC composite beams,and a simplified method based on the equivalent rectangular stress distribution approach has also evolved.The theoretical results are found to be in good agreement with the test data.