ABSTRACT
In the past, there were two basic approaches used to analyse shear problems in reinforced concrete: namely, the mechanism method and the truss model method. The mechanism method is the basis of the current shear provisions in the ACI Code (ACI-318, 1989). By fitting the mechanism method to the test results, the ACI method becomes empirical or at best semi-empirical. From a theoretical point of view, this method cannot satisfy the compatibility condition, unless the materials (concrete and steel) are assumed to have infinite plasticity.
