Shear Behavior of Reinforced Concrete Beams with High-Strength Stirrups

2011 ACI Structural Journal  
ACI 318-08 limits the yield strength of shear reinforcement to control diagonal crack width and prevent possible sudden shear failure due to over-reinforcement. The limitations on the yield strength of shear reinforcement provided by the four current design codes-ACI 318-08, CSA A23.3-04, EC2-02, and JSCE-02-differ substantially from one another. ACI 318-08 limits the yield strength of shear reinforcement to 420 MPa (60,900 psi), whereas JSCE-02 allows the yield strength to reach up to 800 MPa
more » ... each up to 800 MPa (116,000 psi) when the compressive strength of the concrete is greater than 60 MPa (8700 psi). This paper presents the effects of the yield strength of shear reinforcement and the compressive strength of concrete on the shear behavior of reinforced concrete (RC) beams. Thirty-two simply supported RC beams with high-strength stirrups were tested. Although the test beams were designed to have a much greater yield strength of shear reinforcement than that required in ACI 318-08, the test beams failed in shear after the yielding of shear reinforcement. In addition, the analytical and experimental results indicated that the diagonal crack width at different load levels of all the tested beams was nearly constant regardless of the yield strength of shear reinforcement.
doi:10.14359/51683219 fatcat:amx7idkct5arnf4myudkkcf4rm