| Title |
Seismic Retrofit Method for Reinforcement Concrete Column Using Steel Rod Subjected to Torsional Load |
| Authors |
임지훈(Lim, Ji Hoon) ; 김찬휘(Kim, Chan Hwi) ; 이영학(Lee, Young Hak) |
| DOI |
https://doi.org/10.5659/JAIK.2022.38.3.231 |
| Keywords |
Seismic Retrofit; Concrete Column; Cyclic Loading Test; Torsion; Combined Load |
| Abstract |
The seismic retrofit method for reinforced concrete (RC) column using steel rod is proposed to resist combined load including torsion and to
enhance constructability. The proposed method involves the installation of steel rods on the RC column externally to improve seismic
capacity when subjected to seismic load. To investigate seismic performance, three RC columns with non-seismic detail were manufactured
and a cyclic loading test was conducted. To evaluate the seismic performance of retrofitted column in practical, the eccentricity of both axial
and lateral load was applied on control specimen and on one retrofitted column; to compare the effect of eccentricity of axial load, the other
retrofitted column was subjected to no eccentricity on axial load. The experiment results indicated that the proposed steel rod retrofit method
effectively resisted seismic load by enhancing the maximum load about 61% compared to the control specimen. Similar to the result of
maximum load, retrofitted column showed improvement in twist response, effective stiffness, ductility, and energy dissipation capacity.
Additionally, since torsion is applied by eccentric lateral load on RC column, the concentric axial load caused the reduction of seismic
capacity compared to eccentric axial load. |