Glass fiber reinforced thermosetting polymer plastic (GRP) is widely used in the construction industries due to the advantages of their superior mechanical and physical characteristics. Most of pipes are installed for long-term purposes and they should be safely installed in consideration of installation conditions because there are unexpected various terrestrial loading conditions. In this paper, we present the result of investigation for 253 days pertaining to the structural behavior of flexible pipes buried underground. From the buried test results, we predicted long-term, up to 60 years, ring deflection of GRP pipes buried underground based on the method suggested by the existing literature. It was found that the GRP flexible pipe is appropriate because 5% ring deflection limitation of 60 years could be satisfied.

ABSTRACT
 1. 서 론
 2. GRP관의 지중매설실험
 3. GRP관의 장기관형 예측
  3.1 장기관변형 예측 이론
  3.2 장기관변형 예측 결과
 4. 결론
 References

• 장민준(홍익대학교 토목공학과) | Jang Mim-Jun
• 박관수(홍익대학교 공과대학 토목공학과) | Park Guan-Soo
• 주형중((주)아이시스이앤씨) | Joo Hyung-Jung
• 김주범((주)한국화이바) | Kim Joo-Beum
• 윤순종(홍익대학교 공과대학 토목공학과) | Yoon Soon-Jong