ACI 421.1R-99 (R2006)

Tests have established that punching shear in slabs can be effectively resisted by reinforcement consisting of vertical members mechanically anchored at the top and bottom of slabs. ACI 318 sets out the principles of design for slab shear reinforcement and makes specific reference to stirrups and shear heads. This report reviews other available devices and recommendations for their design. The application of these recommendations is illustrated through a numerical example.