Modified interactive strut-and-tie model for shear strength prediction of RC corbels

Abstract

On the basis of the modified Kupfer and Gerstle’s biaxial failure criterion ofconcrete, amodified interactive strut-and-tie model (MISTM) to predict the nominal shear strength of RC corbels was derived and is proposed in this paper. The MISTM includes the interaction between the load-carrying capacity of a concrete strut and a tension tie, andthe effects of horizontal force.The numberof horizontal and vertical stirrups wasconsidered. To validate and calibrate the MISTM, a dataset test results for 302 corbelswascollected from the literature. Finally, the predictions obtained from the MISTMwere also compared with those computed usingthe strut-and-tie models in accordance with the ACI 318 code and the state-of-the-art presented in the literature, and arefound to be more accurate and reliable.

Keywords

• Corbels
• Shear strength
• Strut-and-Tie
• Reinforced concrete