Seismic Performance of Steel tube-reinforced Steel Fiber high-strength Concrete Columns with ultra-high Strength Steel Bars

Quasi-static tests of five full-scale steel tube-reinforced high-strength concrete (STRHSC) column with ultra-high strength steel bars (UHSS) were conducted. Due to the large elastic range of UHSS, the column can obtain obvious drift-hardening behavior to reduce residual deformation. The research results reveal that steel fiber-reinforced STRHSC columns with UHSS had superior damage control capability and reparability. According the damage evolution theoretical analysis and measured result, a prediction model of skeleton curve, residual deformation, cumulative energy dissipation and hysteretic curve of STRHSC columns with UHSS was proposed. The model was then verified by comparing prediction results with test results.