ACI318M-19 Hanger reinforcement for shear transfer

According to ACI318M-19 section R9.7.6.2.1 If a reinforced concrete beam is cast monolithically with a supporting beam and intersects one or both side faces of a supporting beam, the soffit of the supporting beam may be subject to premature failure unless additional transverse reinforcement, commonly referred to as hanger reinforcement, is provided (Mattock and Shen 1992). The hanger reinforcement (Fig. R9.7.6.2.1), placed in addition to other transverse reinforcement, is provided to transfer shear from the end of the supported beam. Research indicates that if the bottom of the supported beam is at or above mid-depth of the supporting beam or if the factored shear transferred from the supported beam is less than 0.25sq root f’c bwd, hanger reinforcement is not required.