Biaxially loaded slender high-strength reinforced concrete columns with and without steel fibres

Abstract

This paper explores the load-deformation behaviour of plain andjbrous high-strength reinforced concrete slender columns from zero load until failure. The proposed empirical stress-strain equations given here for high-strength and high-strength steel fibre concretes were used as material properties to modify the computer programs of biaxially loaded slender columns previously developed. The new computer program can evaluate the complete biaxial load-deflection and moment-curvature relation-ships of slender columns. A total of nine high-strength and five high-strength steel fibre reinforced concrete columns were tested to compare their experimental load-deformation results with the analytical values derived from theoretical studies. Agreement was satisfactory for both ascending and descending branches of the load- deformation curves.