GFRP(Glass Fiber Reinforced Polymer Plastic) has a superior corrosion resistance, high specific strength/stiffness, etc. Therefore, such properties can be used to mitigate the problems associated with the use of conventional construction materials. In this study, the various rib and pitch distance of hybrid fiber GFRP bars were evaluated by experimental method. From the test result, thirty two types of FRP hybrid bars such as spiral type with the dimension of rib geometry were fabricated. To evaluate the bond properties of them, direct pull-out test was performed. All testing procedures including specimen preparation, set-up of test equipment and measuring devices were made in accordance with the recommendations of ASTM D 7913. From the test results, it was found that cross type hybrid GFRP reinforcing bars showed the highest bond strength than that of the others due to the higher relative rib area.

ABSTRACT
 1. 서 론
 2. FRP Hybrid Bar의 제작
 3. FRP Hybrid Bar의 부착시험
  2.1 시험 개요
  2.2 시험 결과
 4. 결 론
 References

• 박준석(한국건설기술연구원 구조융합연구소)
• 박기태(한국건설기술연구원 구조융합연구소)
• 유영준(한국건설기술연구원 구조융합연구소)
• 김병철(한국건설기술연구원 구조융합연구소)
• 서동우(한국건설기술연구원 구조융합연구소) | Seo Dong-Woo