Ductility of Spirally-Confined Concrete Columns

by M. J.N. Priestley, Reader in Civ. Engrg.; Univ. of Canterbury, Christchurch 1, New Zealand,
R. T. Potangaroa, Asst. Engr.; Ministry of Works and Development, New Zealand,
R. Park, (M.ASCE), Prof. and Head of Civ. Engrg. Dept.; Univ. of Canterbury, Christchurch 1, New Zealand,

Serial Information: Journal of the Structural Division, 1981, Vol. 107, Issue 1, Pg. 181-202

Document Type: Journal Paper

Abstract: Five large circular reinforced concrete columns confined by spiral reinforcement in accordance with the provisions of the draft of the New Zealand Concrete Design Code were tested under reversed cyclic bending combined with various axial load levels. Results of load-deflection hysteresis loops, curvature distributions, and confining and shear steel strains are presented. Substantial enhancement of flexural and shear strength values (above those predicted using normal ultimate strength theory) was obtained. A method for predicting confined moment capacity is suggested.

Subject Headings: Concrete columns | Ductility | Reinforced concrete | Shear strength | Flexural strength | Ultimate strength | Axial loads | Standards and codes | Load and resistance factor design | New Zealand

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