Ductile Behaviours of High Strength Concrete Columns Confined by High Strength Transverse Reinforcement

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Title: Ductile Behaviours of High Strength Concrete Columns Confined by High Strength Transverse Reinforcement

Author(s): H. Mugurumu

Publication: Special Publication

Volume: 128

Issue:

Appears on pages(s): 877-892

Keywords: axial loads; bending; columns (supports); confined concrete; cyclic loads; ductility; flexural strength; high-strength concretes; moment-curvature relationship; reinforced concrete; reinforcing steels; structural analysis; tests; Structural Research

Date: 11/1/1991

Abstract:
The authors had tested eight square reinforced concrete columns subjected to combined flexure and constant axial loads of 0.254 to 0.629 f'?c A?g, and the test results were reported in a previous paper. This study is a continuation of that previous study. The objective of this study is to evaluate the ductility enhancement of high-strength concrete columns achieved by effectively confining the core concrete using transverse reinforcement with high yield strength. Four test columns were constructed using concrete with compressive strength of 130 MPa, transverse reinforcement with yield strength of 408 or 873 MPa, and ordinary longitudinal reinforcement. Those columns tested under reversed cyclic lateral loads with constant axial compressive load levels of 0.343 or 0.473. Test results indicated that even for such high-strength concrete columns adequate ductility was secured by using high-strength transverse reinforcement. Based on the test results, the stress-strain model on confined concrete previously proposed by the authors was modified to be applicable not only to ordinary strength concrete but also to high-strength concrete