HCFFT (Hybrid Concrete Filled FRP Tube) is consisted of pultruded FRP unit module, filament winding FRP which is in the outside of mandrel composed of circular shaped assembly of pultruded FRP unit modules, and concrete which is casted inside of the circular tube shaped hybrid FRP pile. The pultruded FRP can increase the flexural load carrying capacity and the filament winding FRP can provide the confinement for the concrete filled inside. The axial and flexural load carrying capacities of small diameter HCFFT piles were evaluated through the experimental and theoretical studies. In this study, we suggest the cross-section and manufacturing process of large diameter HCFFT pile which is expected to improve the quality and productibility of large diameter HCFFP pile.

ABSTRACT
 1. 서 론
 2. 소구경 HCFFT의 제작방법
 3. 대구경 HCFFT의 제작공정
 4. 결 론
 참고 문헌

• 이승후(홍익대학교 토목공학과) | Lee Seng-Hoo
• 최진우(홍익대학교 토목공학과) | Choi Jin-Woo
• 주형중((주)아이시스이엔씨) | Joo Hyung-Joong
• 박준석(서일대학교 토목과) | Park Joon-Seok
• 윤순종(홍익대학교 토목공학과) | Yoon Soon-Jong