Stress-Strain Behavior of Concrete Confined by Overlapping Hoops at Low and High Strain Rates

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Title: Stress-Strain Behavior of Concrete Confined by Overlapping Hoops at Low and High Strain Rates

Author(s): B. D. Scott, R. Park, and M. J. N. Priestley

Publication: Journal Proceedings

Volume: 79

Issue: 1

Appears on pages(s): 13-27

Keywords: columns (supports); compressive strength; confined concrete; deformation; eccentric loads; failure; hoops; loads (forces); reinforced concrete; reinforcing steels; strains; stresses; stress-strain relationships; tests.

Date: 1/1/1982

Abstract:
An experimental investigation into the behavior of short reinforced concrete columns is described. Twenty-five concrete units, each 450 mm (17.7 in.) square by 1200 mm (47.2 in.) high, containing either 8 or 12 longitudinal steel bars and different arrangements of square or octagonal steel hoops, were subjected to concentric or eccentric loads to failure at different strain rates. Results presented include an assessment of the effect of eccentricity of load, strain rate, amount and distribution of longitudinal steel, and amont and distribution of transverse steel. A stress-strain curve for concrete confined by hoop reinforcement and loaded at a high strain rate (comparable with seismic loading) is proposed and compared with an wisting curve based on previous tests conducted at low strain rates. The available ultimate compressive strain for concrete confined by hoop reinforcement is also discussed.