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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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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 Rectangular Reinforced Concrete Columns
Author(s): S. A. Mirza
Publication: Structural Journal
Appears on pages(s): 425-435
Keywords: building codes; columns (supports); flexural strength; moments; loads (forces); reinforced concrete; slenderness ratio; stiffness; statistical analysis; structural design; tied columns; Design
Abstract:The ACI Building Code permits a moment magnifier approach for design of slender reinforced concrete (RC) columns. This approach is strongly influenced by the effective flexural stiffness EI of the columns, which varies due to cracking, creep, and nonlinearity of the concrete stress-strain curve, among other factors. However, the EI expressions given in the ACI Building Code are quite approximate when compared with the values of EI derived from thrust-moment-curvature relationships. This study was undertaken to determine the influence of a full range of variables on EI of slender tied rectangular RC columns bent in symmetrical single curvature under short-time loads. Approximately 9500 columns, each with a different combination of variables, were used to generate the stiffness data. The EI expressions were then statistically developed for use in slender column designs. Two sets of equations are proposed in this paper: (a) Eq. (21) through (23) for initial sizing and preliminary design of structures; and (b) Eq. (18) through (20) for use in final (more accurate) structural designs.
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