It is widely known that the shear strength of a reinforced concrete (RC) or prestressed concrete (PC) beam results from the interaction of different resisting actions. Thus, available simplified shear models emphasize different resisting actions. The model described herein is a simplification of the multi-action shear model the authors developed. The authors' shear model is expressed in the form of easy-to-use equations while maintaining its sound mechanical background. The nominal shear strength provided by concrete Vc is given by only one equation that is valid for RC and PC members with and without axial loads; with and without transverse reinforcement; and with I, T, or rectangular cross sections. The model takes into account the beneficial influence of the compression flanges as well as the confinement of the compression chord provided by the stirrups. Cladera et al describing the model derived as a compromise between simplicity and accuracy.

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