| Title |
Strengthening Performance of Reinforced Concrete Beams Based on Externally Post-Tensioned Steel Rod Details |
| Authors |
강성훈(Kang, Seong-Hun) ; 박병태() ; 김보성() ; 이태훈() ; 신동현() |
| DOI |
https://doi.org/10.5659/JAIK.2025.41.6.267 |
| Keywords |
Strengthening Effect; Externally Post-tensioning Reinforcement; Reinforced Concrete Beam; Post-tensioning; Anchorage |
| Abstract |
This study examines the strengthening effect of externally post-tensioned steel rods on reinforced concrete (RC) beams, focusing on different
reinforcing details. To enhance the strengthening performance, a method involving steel plate installation at the anchorage zone is introduced,
aiming to reduce concrete failure after applying post-tensioning force to the rods. RC beams retrofitted with post-tensioned steel rods showed
at least a 1.2-fold increase in both initial stiffness and maximum strength compared to unretrofitted specimens. In particular, specimens with
the proposed anchorage zone detail demonstrated a 19% increase in initial stiffness and an 11% increase in maximum strength compared to
those using only post-tensioned rods. For optimal strengthening, the strain in the steel rods should approach their yield strain. Therefore,
improving the shear strength of the anchorage zone is crucial in preventing premature failure in unintended areas. |