Seismic Performance Test Study on Circular HSC Columns Confined with High-Strength PC Rebar

The purposes of this paper were focused on seismic performances of circular HSC columns confined with high-strength PC rebar.The experiment for 6 model specimens,which the yield strength of PC rebar was 1?420 MPa and concrete grades were C60 and C90 respectively,was carried out under the low circle loads.The influence factors on the seismic performances of the columns were researched by using varieties parameters of axial compression ratios,stirrup reinforcements(index,space and type),longitudinal rebar and concrete grades.The failure mechanisms were clarified and were also determined experimentally.An empirical formula represented the relationship of the displacement ductility,the compressive ratio and index of stirrup is derived numerically on the basic of the test data.The results of the test show that the ductility of the HSC columns can be effectively improved by use of ultra high strength steel bars for the partial of longitudinal reinforcement and stirrup.