Abstract
The use of external reinforcement has gained an increasingly major position due to the adjustment in earthquake standards, mandating a significant improvement in the section’s moment capacity. Studies on the behavior and enhancement contributed by FRP sheets demonstrated that its effectiveness was a direct function of the shear-bond strength. A prominent contributing factor was the response of the interface between the sheets and the epoxy resin, and the interface between the epoxy resin to the concrete surface. Recently, FRP rods were produced. These rods which are 8 and 10 millimeters in diameter offer ease in use, and simplicity in the application procedure. This study looked into the shear-bond behavior of FRP rods as compared to sheets. Direct tensile stresses were applied to test the shearbond between the sheets and rods, attached to a 35 MPa concrete surface. The failure behavior of the bond was also monitored. Additionally, the effectiveness of the embedded depth of the FRP rods relative to the concrete surface was also analyzed.
Highlights
The use of external reinforcement for reinforced concrete structures is especially useful when dealing with special cases where an enhancement in section capacity is required
While in the past these external reinforcements were predominantly performed using steel bars or steel plates, it has become clear that the introduction of Fiber Reinforced Polymer (FRP) provides a much better alternative in improving a section’s performance
All FRP reinforcements are attached to the concrete with an epoxy resin that chemically materializes an interface between the concrete and the FRP
Summary
The use of external reinforcement for reinforced concrete structures is especially useful when dealing with special cases where an enhancement in section capacity is required. The evaluation of FRP use in Europe was outlined by Taerwe and Matthys [1], while in the USA FRP tendons were used to utilize prestressed concrete sections [2]. From the introduction of FRP rods to be used as external reinforcement rose an interesting topic for continuing investigation in the bond behavior of FRP. Contradictory to the FRP sheets, the position of FRP rods relative to the concrete surface became a variable. A study was conducted to evaluate the effect of the relative position of FRP rods to the concrete surface [3]. It was shown that the bond behavior of FRP rods was a direct function to the relative distance of the rods to the concrete surface. This paper analyses and compares the effectiveness and bond behavior of the two systems: the FRP sheets and FRP rods
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