Abstract
In situations where high-strength concrete (HSC) is used for reinforced concrete members subjected to seismic loading, it is more difficult to achieve ductile behavior of such members than when normal-strength concrete is used. This paper presents an experimental study of a number of quasi-static axial loading tests on HSC specimens confined by various amounts of transverse reinforcement. A stress-strain relationship for confined HSC is proposed that is found to give reasonably good prediction of the experimental behavior of circular and square specimens with HSC confined by either normal- or ultra-high-yield-strength with various configurations. An empirical formula for the ultimate longitudinal strain of confined HSC corresponding to the first hoop or spiral fracture is also proposed.
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