Abstract
Investigators tested 30 high-strength concrete corbels to destruction. Variables considered in the investigation were shear span-to-depth ratio, concrete strength, and the provision of secondary reinforcement. The investigation examined corbel behavior in the context of the previous parameters and compared the experimental results with the American Concrete Institute (ACI) 318-89 design method and the plastic truss model of Rogowsky and MacGregor. Particular attention was given to determining the concrete efficiency factor for members failing in compression, and the results were compared with the efficiency model proposed by Warwick and Foster. The findings revealed that good load predictions can be obtained using the plastic truss model when combined with the Warwick and Foster efficiency factor. Researchers concluded that the design method given in ACI 318-89 is not appropriate for corbels fabricated using high-strength concrete.
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