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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Flexural Stiffness of Reinforced Concrete Columns and Beams: Analytical Approach
Author(s): Madhu Khuntia and S. K. Ghosh
Publication: Structural Journal
Appears on pages(s): 351-363
Keywords: beam; column; flexural stiffness; moment
Abstract:The present ACI code (ACI 318-02) provisions on effective stiffnesses of beams and columns are reviewed. Factors influencing the moments of inertia of beams and columns are discussed. The primary variables considered are: the reinforcement ratio, the axial load ratio, the eccentricity ratio, and the compressive strength of concrete. On the basis of a parametric study, simple formulas are proposed to determine the effective stiffnesses of reinforced concrete columns and beams. The proposed stiffness expressions are applicable for all levels of applied loading, including both service and ultimate loads. The analytical results show that the flexural stiffness assumption in the current ACI code procedure for design of slender columns using the moment magnifier method (Eq. (10-11) and (10-12)) is extremely conservative. Recommendations are made concerning stiffness assumptions in the analysis of reinforced concrete frames under lateral loads.
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