Abstract
In this paper, two equations to estimate ultimate shear strength of circular reinforced concrete columns and bond strength of longitudinal reinforcement in the columns are derived. The first equation is composed of truss mechanism strength of transverse reinforcement and arch mechanism strength on concrete strut based on plastic theory. The second one is derived by using the ideas employed in similar equations, which are based on experimental studies, for members with rectangular sections. Compatibility of the two derived equations are examined by comparing calculated values with experimental ones obtained from previous experiments.
