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Title |
Pseudo-Ductile Hybrid FRP Sheet for Strengthening Reinforced Concrete Beams
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Keywords |
하이브리드 ; 유사연성 ; 섬유보강폴리머 ; 휨보강 ; FRP 시트 hybrid ; pseudo-ductile ; fiber reinforced polymer ; flexural strengthening ; FRP sheet |
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Abstract |
Use of both carbon fiber (CF) and glass fiber (GF) at the same time to strengthen existing flexural members was exploited. Using a proper volumetric GF / CF ratio, the CF can rupture first followed by subsequent rupture of CF at higher stress and strain showing a pseudo-ductile behavior. A theoretical study indicated that the ratio is 4.62 · 1 and higher where the pseudoductile effect can be shown . Flexural tests of plain concrete beams strengthened using fibers were first carried out. Hybrid FRP sheet using 8.8 . 1 ratio was then fabricated and the sheet was used to strengthen reinforced concrete beams. The RC beams strrngthened using 1-ply and 2-ply hybrid sheets both revealed increased strength over a non-strengthened beam and ductile flex-ural behavior. A comparable beam strengthened using CF also showed increased strength but with limited ductility.
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