| Title |
Shear Strengthening by Externally Post-tensioning Steel Rods in Damaged Reinforced Concrete (RC) Beams |
| Authors |
Lee, Swoo-Heon ; Lee, Hee-Du ; Park, Seong-Geun ; Shin, Kyung-Jae |
| DOI |
https://doi.org/10.5659/JAIK_SC.2018.34.1.3 |
| Keywords |
Post-tensioning ; Reinforced Concrete Beam ; Damage ; Shear Strengthening ; Steel Rod ; Externally Unbonded |
| Abstract |
This experimental investigation was conducted to observe the shear strengthening behavior of pre-damaged reinforced concrete (RC) beams strengthened with externally post-tensioning steel rods. A total of six simply supported beams ― two control beams and four post-tensioned beams using external steel rods ― were tested to failure in shear. The external steel rods of 18mm or 28mm diameter were respectively employed as post-tensioning material. The four post-tensioned beams have a V-shaped profile with a deviator (or saddle pin) located at mid-span, and the post-tensioning system increased the low load-carrying capacity and overcame a little bit of deflection caused by damage. Concretely, the load-carrying capacity and flexural stiffness were respectively increased by about 25~57% and 263~387% due to the post-tensioning when compared with the unstrengthened control beams. |