A unified ductility formula is proposed for both reinforced and prestressed concrete flexural members. This equation is intended as a substitute for the maximum tensile reinforcement provisions in the ACI Code for both types of construction. Furthermore, the formula allows designers to adjust other factors that affect ductility, such as concrete confinement in the compression zone. The proposed formula is extremely easy to use in comparison with other available recommendations, is applicable to sections of general shape and reinforcement content, and gives reasonable results. Numerical examples and proposed ACI Code and Commentary revisions are presented.
