Performance of large reinforced concrete columns under axial compression loads Available to Purchase

Six sets of large-scale, square, reinforced concrete columns are tested under monotonically static axial compression loads. The primary variables are type of crosstie engagement, crosstie placement offset and type of hoop. The tests confirm that the crosstie hook engaging the hoop or engaging both the hoop and the longitudinal steel bars is better than just engaging the longitudinal steel bar. It is observed that the effect of not altering end for end along the longitudinal reinforcement is not significant to the efficiency of the crossties. Hoops composed of two overlapped L-shape ties, with a 135° hook at each end, in reinforced concrete columns gave acceptable performance, and it is convenient to facilitate the fabrication of reinforcing cages using that set-up. However, the effectiveness under cyclic loading needs further study.