Effect of Steel Fiber Ratios on Hybrid Eccentric Reinforced Concrete Columns with SIFCON
摘要
The study aims to clarify the influence of steel fiber ratios on hybrid eccentric R.C. columns with a 50 mm thick SIFCON layer, considering different reinforcement ratios (ρ1 = 0.0113 and ρ2 = 0.0226). The experimental program involved casting six specimens, two as reference columns with normal strength concrete only and four as hybrid reinforcement concrete with SIFCON, subjected to eccentric loading 30 mm away from the column's center to determine load-carrying capacity, stiffness, ductility, and energy absorption. Test results revealed that using the SIFCON layer in the tension zone improved the strength and overall behavior of the specimens, with an increase in volume fraction. The maximum load increased by 63% in group A (ρ = 0.0226) and by 104% in group B (ρ = 0.0113) compared to unstrengthened NSC columns. The ductility index increased for all hybrid columns compared to the NSC control column, reaching 77% in group A and 225.7% in group B. Energy absorption also increased by 30% in group A and 67.4% in group B, while stiffness increased by 274.61% in group A and 613% in group B compared to the NSC control column.