Analysis of Reinforced Concrete and Composite Columns With and Without Steel Fibers

Abstract

Analysis of eccentrically loaded plain and steel fiber high strength reinforced concrete and concrete-encased composite columns is presented. In the analysis procedure, the experimental nonlinear stress−strain relations are used for plain and steel fiber concrete material. The concrete compression zone of the section is divided into segmental subdivisions parallel to the neutral axis. The compression stress resultants of the concrete material and structural steel have been calculated in the centre of each segment. In the presented study, a computer program has been developed based on the proposed procedure for the prediction of ultimate strength analysis of eccentrically loaded steel fiber high strength reinforced concrete and composite columns. The main parameters of this study are the concrete compressive strength, load eccentricity, steel yield stress, slenderness effect and steel fiber content. The results show that adding steel fibers into high strength concrete significantly improves the ductility and deformability of reinforced concrete and composite columns under biaxial bending and axial load.