Concrete capacity design of Cazaly hangers in shallow members

This paper evaluates the behavior of the Cazaly hanger under vertical load and proposes an additional design requirement for the connection. In 1965, Canadian PCI instigated a research program to evaluate the behavior of the hanger, which led to the shear-friction design basis for the hanger in the third edition of the PCI Design Handbook: Precast and Prestressed Concrete. Current tests show that in shallow sections the hanger does not follow shear-friction behavior but instead behaves more closely to a concrete-breakout model. Reassessment of the 1965 specimens revealed shear-friction to be a poor predictor of capacity in shallow sections, while the concrete-breakout models provide conservative predictions. A proposed revision to the sixth edition of the PCI Design Handbook based on concrete-breakout capacity is recommended for Cazaly hanger design method.