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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: Unified Approach for Minimum Reinforcement of Concrete Beams
Author(s): Alessandro P. Fantilli, Bernardino Chiaia, and Andrea Gorino
Publication: Structural Journal
Appears on pages(s): 1107-1116
Keywords: bending moment; ductility index; fiber-reinforced concrete beams; lightly reinforced concrete beams; minimum reinforcement
Abstract:The structural behavior of lightly reinforced concrete (LRC) and fiber-reinforced concrete (FRC) beams in bending is similar and
depends on the amount of reinforcing bars and fibers, respectively. For this reason, a unified approach is introduced herein for the evaluation of the minimum reinforcement. Such approach is based on the definition of the ductility index (DI), which is a function of the difference between the ultimate bending moment and the effective cracking moment. DI is higher than zero when LRC and FRC beams show a ductile response, whereas it is negative in the case of a brittle behavior. In accordance with several experimental data, the linear dependence of DI on the amount of reinforcement can be demonstrated. Thus, a new design-by-testing procedure can be established to determine the minimum reinforcement (that is, reinforcing bars or fibers) of a concrete beam, which corresponds to DI equal to zero.
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