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Title |
Evaluation of Seismic Restoration Behavior of Severely Damaged RC Columns
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Authors |
오나경(Na-Kyung Oh) ; 양근혁(Keun-Hyeok Yang) ; 황승현(Seung-Hyeon Hwang) |
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DOI |
https://doi.org/10.4334/JKCI.2021.33.5.433 |
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Keywords |
손상 기둥; 내진 복원; 휨 내력; 연성 damaged columns; seismic restoration; flexural strength; ductility |
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Abstract |
The objective of this study was to examine the seismic performance of columns entirely restored with new reinforcing bars and concrete. These columns were formerly severely damaged non-seismic columns. The restored columns were designed to have the same geometrical dimension and arrangement of longitudinal reinforcement as the original non-seismic columns. All column specimens were tested under a constant axial load and cyclic lateral loads. Test results showed that the flexural strength of the restored columns was equivalent to that of the non-seismic columns and predictions calculated using the rectangular stress block specified in ACI 318-19. The restored columns exhibited higher displacement ductility ratios than the non-seismic columns, the former being as much as 1.35 times and 1.66 times for the axial load level of 0.25 and 0.5, respectively; and the corresponding values for the improved rates of the equivalent damping ratios calculated up to 80 % peak load at the post-peak branch were 1.18 and 1.47, respectively.
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