The paper, at hand, reports and discusses an experimental research, focusing on the flexural and shear behavior of reinforced Ultra-High Performance Fiber Reinforced Concrete, hereafter referred to as UHPFRC, beams. Five beams made with UHPFRC and without stirrups were tested to investigate the shear capacity of UHPFRC. Parameters flexural reinforcement ratio and shear span to depth ratio are examined. Empirically based design criteria found in the commonly used design codes, CSA A23.3-04 and ACI-318-08, do not accurately predict the capacity of reinforced concrete beams with a compressive strength exceeding 50 MPa. In addition, the design criteria don't take into consideration the effect of fiber reinforcement, which proves to have a significant effect on the behavior of concrete. Failures in concrete beams, without steel reinforcement, are typically brittle and sudden and occur with little to no warning. Fundamental understanding of the fiber reinforcement contribution to concrete behavior is essential to the development of design guidelines for UHPFRC The research investigates the shear and flexural behavior of UHPFRC beams without stirrups. A comparison of existing design models is also investigated. The test results are compared to exiting shear capacity models for fiber reinforced concrete.
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