Shear Friction Reinforcing Design

The shear friction concept assumed that such a crack is formed when concrete will be cast at different times and that reinforcement is provided across the crack to resist relative displacement along it. The reinforcement in tension provides a clamping force, Avf x fy across the crack faces

The shear friction theory/model is one of the approaches adopted in design standards for predicting strength under longitudinal shear between concrete elements cast at different times and same time.