Capacity of Reinorced Rectangular Columns Subject to Biaxial Bending

Comprehensive design charts complying to Section 1905( a) of the ACI Building Code (318-63) relating the biaxial bending capacity of rectangular columns to the uniaxial bending capacity by a single parameter are presented. Differences in the behavior of columns due to bar arrangement and steel strengths are noted. An approximate procedure which facilitates the determination of the required size for columns subject to biaxial bending is suggested and evaluated.