Title: Reinforced Concrete Column Design Equations

Author(s): Bekele Mekonnen

Publication: Journal Proceedings

Volume: 81

Issue: 3

Appears on pages(s): 242-250

Keywords: approximation;columns(supports);limit state design; reinforced concrete; strength method;structural design.

DOI: 10.14359/10680

Date: 5/1/1984

Abstract:
Simple approximate equations for the design of rectangular and circular columns are proposed based on a study of dimensionless load-moment- interaction charts, aimed at deriving closed form equations closely approximating the charts. The resulting proposed equations achieve this aim and may therefore be used, instead of interaction charts, for the design of columns. The fact that the equations are presented in closed form also enables applications outside routine design. The equations are applicable to both the ACI and CEB approaches of strength design, as well as to the alternate design method of A CI Standard 318-77. A design example is presented in the Appendix to demonstrate the advantages of using the proposed equations. Finally, a proposal is made that allows use of the same interaction charts by ACI and CEB.