Effect of lateral confinement on short columns under uni-axial compression

Abstract

The present study investigates the performance of RCC short columns strengthened with lateral confinement under uni-axial compression. The work is carried out in two phases of study casting forty-two number of RC columns. In the first phase of study, two variables volumetric ratio and spacing lateral ties considered and their influence on ultimate load carrying capacity of short columns are examined. In the second phase of study, effect of industrial waste exhausts like FA and GGBS on similar columns casted in first phase is studied. The column specimens are tested for uniaxial compressive loading in increments up to ultimate failure load on UTM of capacity 1000kN. It was reported from the study that the volumetric ratio, spacing of steel reinforcement increases, the ductility as well as strength of short columns increased. The incorporation of flyash and GGBS in place of cement also enhanced the ultimate load carrying capacity of the columns with constant volumetric ratio and spacing stirrups in the second phase of work. The failure occurred in zone of rupture at both ends of short column and a brittle mode of fracture was observed. Further, the study reported that the decrement in spacing of ties tends to decrease the zone of rupture in all specimens of short columns.