| Title |
Ductility Capacity of Ultra-high Strength R/C Tied Columns Considering the Axial Load Ratio and Configuration of Transverse Reinforcement |
| Authors |
Kim Jong-Kuen ; Han Byum-Seok ; Shin Sung-Woo |
| Keywords |
Ultra-high Strength Concrete ; Tied Column ; Configuration and Volumetric Ratio of Transverse Reinforcement ; Axial load Ratio ; Ductility Capacity |
| Abstract |
An experimental investigation was conducted to examine the hysteretic behaviors of ultra-high strength concrete tied columns. The purpose of this study is to investigate the safety of ultra-high strength concrete columns with 100 MPa compressive strength for the requirement of ACI provisions. Eight 1/3 scaled columns were fabricated to simulate an 1/2 story of actual structural members with the cross section 300×300 mm and the aspect ratio 4. The main variables are axial load ratio, the configurations and volumetric ratios of transverse reinforcement. The results show that the ductility of columns are affected by the configurations and volumetric ratios of transverse reinforcement. Especially, it has been found that the behavior of columns are affected by axial load ratio rather than the amounts and configurations of transverse reinforcement. Therefore, when the level of axial load is about 50 percent of column axial load capacity and concrete compressive strength is approximately 100 MPa in same condition, the amount of transverse reinforcement is required over 30 percent larger than specified in the seismic provisions of ACI 318-05 code for ductile behavior. Consequently, to secure the ductile behavior of 100 MPa ultra-high strength concrete columns, ACI provisions for the requirement of transverse reinforcement may considered axial load level and the details of transverse reinforcement. |