BIAXIALLY LOADED SLENDER HIGH-STRENGTH REINFORCED-CONCRETE COLUMNS WITH AND WITHOUT STEEL FIBERS

This paper explores the load-deformation behaviour of plain and fibrou s high-strength reinforced concrete slender columns from zero load unt il 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 load ed slender columns previously developed. The new computer program can evaluate the complete biaxial load-deflection and moment-curvature rel ationships of slender columns. A total of nine high-strength and five high-strength steel fibre reinforced concrete columns were tested to c ompare their experimental load-deformation results with the analytical values derived from theoretical studies. Agreement was satisfactory f or both ascending and descending branches of the load-deformation curv es.