Effect of Steel Strength and of Reinforcement Ratio on the Mode of Failure and Strain Energy Capacity of Reinforced Concrete Beams

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Title: Effect of Steel Strength and of Reinforcement Ratio on the Mode of Failure and Strain Energy Capacity of Reinforced Concrete Beams

Author(s): ACI Committee 439

Publication: Journal Proceedings

Volume: 66

Issue: 3

Appears on pages(s): 165-173

Keywords: beams (supports) ; blast resistant construction; ductility; dynamic loads; earthquakes; flexural strength; high strength steel; loads (forces) ; reinforced concrete;reinforcing steel; research; stress-strain relationships.

Date: 3/1/1969

Abstract:
A theoretical study based on idealized stress-strain curves indicates that, within the ductile range of reinforcement ratios, the strain energy capacity is about the same in reinforced concrete beams of equal static bending strength regardless of the yield stress of the reinforcing steel. This suggests that, for a given static load capacity, a beam reinforced with bars having 60,000 psi (42 I8 kg/cm) or 75,000 psi (5273 kg/cm’) yield stress would very likely be almost as satisfactory as a beam reinforced with bars having 40,000 psi (28 I2 kg/cm’) yield stress for resisting blasts, earthquakes, or other dynamic loadings.