Experimental Evaluation of Effect Factors on Seismic Performance of Concrete Columns Reinforced with HTRB630 High-Strength Steel Bars

Abstract HTRB630 steel bar is a new type of high-strength bars. To study the seismic performance and promote application concrete columns reinforced with bars, pseudo-static test 10 bars 3 HRB400 was carried out. Test specimens were divided into five categories according to grade, reinforcement strength, degree confinement. The effect strength (C45 C60), axial load ratio (0.1 0.25), equal substitution longitudinal reinforcements (HTRB630 HRB400), volume stirrups confined HRB400) on are analyzed discussed from failure mode, hysteresis loops, skeleton curves, lateral ductility, energy dissipation capacity, stiffness degradation. mode each specimen bending failure. Reducing lo or increasing reinforcements, could be improved. C60 can improve columns. column slightly increased, ductility capacity reduced, degradation more gradual, coefficient greater than 0.94, but still met requirements code for design buildings (GB50011-2010).