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The ultimate behavior of reinforced concrete corbel is complicated due to the primary design variables including the shear span-to-effective depth ratio a/d, flexural reinforcement ratio, load condition, and material properties. In this study, a simple indeterminate strut-tie model reflecting all characteristics of the ultimate strength and complicated structural behavior is pr oposed for the design of the reinforced concrete corbels with shear span-to-effective depth ratio of a/d ≤ 1. A load distribution ratio, defined as the fraction of applied load transferred by horizontal truss mechanism, is also proposed to help structural designers perform t he design of reinforced concrete corbels by using the strut-tie model approaches of current design codes. For the development of the load distribution ratio, numerous material nonlinear finite element analyses of the proposed indeterminate strut-tie model were cond ucted by changing primary design variables. The ultimate strengths of reinforced concrete corbels tested to failure were evaluated by incorporating the proposed strut-tie model and load distribution ratio into the ACI 318-11‘s strut-tie model method. The validi ty of the proposed model and load distribution ratio was examined by comparing the strength analysis results with those by the ACI 318-11 ‘sconventional design method and strut-tie model methods of current design codes. Key words : Reinforced concrete, Corbel, Strut-tie model, Load distribution ratio              .              1.0         1    -  .   -     -    -          .             -           ,  ,    ,       .     -             ,   ACI 318-11       -        -     . : , , - ,  Concrete Engineering

An Indeterminate Strut-Tie Model and Load Distribution Ratio for Reinforced Concrete Corbels