| Title |
Evaluating Shear Strength Equations for FRP-Strengthened Reinforced Concrete Beams |
| Authors |
서수연(Seo, Soo-Yeon) ; 이성경(Lee, Seong-Kyeong) ; 정연수(Jeong, Yeon-Su) ; 김민(Kim, Min) |
| DOI |
https://doi.org/10.5659/JAIK.2024.40.7.193 |
| Keywords |
Equations for shear strength; Fiber Reinforced Polymer (FRP); Reinforced Concrete (RC) Beam; Near Surface Mounted (NSM); Lateral confining |
| Abstract |
This study aims to evaluate equations for shear strength in Reinforced Concrete (RC) beams strengthened with fiber reinforced polymer
(FRP). A total of 79 experimental results from previous researchers were collected and classified by strengthening method. The existing
equations were then evaluated based on these results. The shear strength calculation formulas considered include those by Nanni and Dias for
Near Surface Mounted (NSM) reinforcement using FRP rods, and those by ACI and FIB for lateral confinement using FRP sheets. The
analysis revealed that for U-wrap lateral confining reinforcement, neither the ACI nor the FIB calculation formulas could safely predict the
strength after shear strengthening. For full-wrap lateral reinforcement, the critical effective strain of 0.004 for FRP, as defined by ACI,
appears to be underestimated compared to experimental results. In the case of NSM strengthening, Dias calculates the effective strain through
an equation, while Nanni uses an experimentally determined average value of 0.0059. The significant difference in the experiment/calculation
ratio for both indicates a need for further research. |