Confinement Effect on transverse reinforcement of ultra high strength R/C tied columns subjected the cyclic and axial load

An experimental investigation was conducted to examine the hysteretic behaviors of ultra-high strength concrete R/C tied columns. The purpose of this study is to investigate the confinement effect on transverse reinforcement of ultra-high strength concrete columns with 100 ??? compressive strength. Columns were fabricated to simulate an 1/2 story of actual structural members and to loads actual lateral forces. The main variables are axial load ratio, the configurations and volumetric ratios of transverse reinforcement. The results show that the confinement effect of core concrete are affected by the configurations and volumetric ratios of transverse reinforcement with axial load level. Therefore, to secure the ductile behavior of 100 ??? ultra-high strength concrete columns, the amount of transverse reinforcement may be considered with axial load level and the details of transverse reinforcement