| Title |
Effects of Design Parameters on Structural Performance of Precast Piers with Bonded Prestressing Steels |
| Keywords |
bonded prestressing steel;prestress;precast pier;quasi-static test;displacement ductility;energy dissipation capacity;부착긴장재;프리스트레스;조립식 교각;준정적 실험;변위연성도;에너지소산능력 |
| Abstract |
Quasi-static tests were conducted to evaluate structural performance of precast piers prestressed by bonded prestressing steels. Combinations of prestressing bars and normal reinforcing bars embedded steel tubes and prestressing strands were used as continuous steels crossing the joints of a precast pier. Main design parameters were steel ratio magnitude of prestress force and section details. Flexural strength and energy dissipation capacity of precast columns with higher steel ratio showed better performance due to continuous steels after opening of the joints. Precast piers with embedded members showed stable behavior after reaching maximum loads resulting in higher displacement ductility and energy dissipation capacity increased as the introduced prestress increased. Self-centering behavior at early stages and stress increase of confining reinforcements were observed from highly prestressed columns. Combination of prestressing steels and normal reinforcing bars should be used in design to prevent rapid strength degradation after reaching the maximum load. |