| Summary: | 碩士 === 逢甲大學 === 土木及水利工程所 === 91 === Concrete must be reinforced with materials strong in tension because of its small tensile capacity. Conventionally, concrete has been reinforced with steel reinforcing bars. To transfer the forces from the concrete to the steel reinforcement, a good shear bond must be developed between the concrete and the steel. Steel reinforcing bars are manufactured with deformed surface to enhance shear transfer. In addition, it needs enough embedment length to develop the full capacity of the rebar. However, if the RC structures are exposed to deteriorative environments, it could leads to corrosion of the reinforcing steel. The whole structure might lose its loading capacity and reduce its service life. This urges the researches of finding a substitute for steel rebar or invention of new corrosion prevention technology. The FRP (fiber reinforced plastic) rebar with good corrosion resistance and high stiffness weight ratio will be a good candidate for this purpose. In this study, a filament winding technique is applied to commercially available FRP rods (with smooth surface) to produce different winding pitch, lug height, and winding angle. This simulated lug will provide the shear transfer mechanism between the FRP rod and concrete. These FRP rods are embedded in the concrete block during the concrete casting. A pullout test of FRP rod from the concrete cylinder was performed to examine the shear transfer capacity made from different winding pitch, lug height, and winding angle. The bond-slip data were recorded during the experiment. The optimum winding method to produce qualified bond, and the required development length for FRP rod are addressed.
Results show that the bond stress of FRP rod with longitudinal and oblique angle winding is better than the bond stress of a FRP rod with 90 degree winding. The process of the former is simple and easy to use than the latter.
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