Title: Equations for Designing Reinforced Concrete Rectangular and Flanged Sections According to ACI 318-83

Author(s): Domingo J. Carreira

Publication: Structural Journal

Volume: 85

Issue: 4

Appears on pages(s): 442-450

Keywords: compression; flanges; flexural strength; reinforced concrete; reinforcing steels; structural design; tension; Structural Research

DOI: 10.14359/2734

Date: 7/1/1988

Abstract:
General design equations are presented for direct calculation of the required tensile reinforcement As in rectangular and flanged concrete sections. The effect of compression reinforcement A's, behaving elastically or yielding, is included. If A's is required, it may be precisely determined after a first assumption. Equations to determine the effective depth d and corresponding As in terms of the maximum allowable or the minimum required tensile reinforcement are also presented. These design equations eliminate the trial-and-error numerical solution or design aids needed when investigation equations are used for design. Examples illustrate the application of the equations and the uniqueness of the design and investigation processes discussed.