| Title |
Analysis and Design Method of Reinforced Concrete Beams Strengthened with Externally Unbonded Steel Rods |
| Authors |
Lee, Jung-Min ; Shin, Kyung-Jae ; Lee, Hee-Du ; Lee, Swoo-Heon |
| Keywords |
Externally Unbonded Steel Rod ; Plastic Hinge Length ; Design Method ; Flexural Analysis |
| Abstract |
This study presents an analysis design method after evaluating the flexural behavior of reinforced concrete (RC) beams with externally unbonded steel rods. It is necessary to evaluate the plastic hinge length, because the plastic hinge length is important to find the deflection of RC beams strengthened with unbonded rods and predict the maximum strain of steel rods at ultimate state. The analysis of RC beams strengthened with unbonded rods is difficult because the strain of externally unbonded steel rods is an unknown value from the conventional strain compatibility of the section. So it would be obtained from the elongation due to beam deflection using the plastic hinge length. In order to simplify of the analysis of RC beams strengthened, it is assumed that unbonded steel rods are the same as double layer reinforcing of tension steel. This method will provide an appropriate design method of RC beams strengthened for designers. |