Increase of Bending Strength of Concrete Beams Reinforced with CFRP Strip

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  • SAKATA Kazuhiro
    Department of Mechanical Engineering, College of Industrial Technology, NIHON University
  • BEN Goichi
    Department of Mechanical Engineering, College of Industrial Technology, NIHON University
  • SAITO Kazuma
    NIHON University
  • SAKURADA Tomoyuki
    Department of Architecture and Architectural Engineering, College of Industrial Technology, NIHON University
  • MOROHASHI Noritaka
    Department of Architecture and Architectural Engineering, College of Industrial Technology, NIHON University
  • OZAWA Nobuyuki
    Fukui Fibertech Co., Ltd.

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Other Title
  • ＣＦＲＰ帯板補強による無筋コンクリートはりの曲げ強度の増加
  • CFRP オビイタ ホキョウ ニ ヨル ムキン コンクリートハリ ノ マゲ キョウド ノ ゾウカ

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Abstract

In 1981, many detached houses collapsed owing to the earthquake which took place at the coast of Miyagi Prefecture in Japan because ferroconcrete was not used as the base of the most of collapsed houses. Therefore, the earthquake-proof design criterion was revised and it obliged newly constructed houses to use ferroconcrete as the base of detached houses since then. However, there are still more than ten million detached houses using aged concrete alone as the base in Japan. In this paper, a reinforcement method for the aged concrete is demonstrated by using the high performance CFRP strips. Three kinds of concrete beams reinforced with the CFRP strips with different vertical insert positions and different numbers of the CFRP strips were tested by a four point bending test method. In order to clarify the effects of CFRP strips, a concrete beam without reinforcement was also tested. The results of the experiment showed that the maximum deflections of the concrete beams reinforced with the CFRP strip were more than one hundred times larger than those of the concrete beams without reinforcement. Although the concrete beam without the CFRP strips collapsed instantly, the concrete beam reinforced with the CFRP strips gradually failed similar to the plastic behavior of metals. This result means that the residents can afford to escape safely from the houses in the event of possible earthquakes. The experimental results were compared with the analytical ones. Both results showed good agreement and the effectiveness of base concrete reinforced with CFRP strips was demonstrated.

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