논문 상세보기
pp.67-73
Recently, the demand for large diameter piles has been rapidly increased in order to secure the allowable bearing capacity of pile foundation due to the increase of large structures such as high rise buildings. In this study, to improve the shear capacity of a conventional PHC pile, a large diameter composite PHC pile strengthened by in-filled concrete and shear reinforcement was manufactured. All the piles were tested according to the shear strength test method of Korean Standard. As a result of the shear test, the F-type piles which are produced without shear reinforcement occurred abrupt horizontal cracks after flexural and inclined shear cracks occurred. On the contrary, the FT-type piles which are produced with shear reinforcement exhibited stable flexural and inclined shear cracks uniformly over the entire pile without abrupt horizontal cracks. Furthermore, the maximum load of the large diameter composite PHC pile improved to 2.9 times in the F series, and more than 3.3 times in the FT series compared to the conventional PHC pile. This result indicated that FT-type piles had excellent composite behavior due to the shear reinforcement and effectively prevented the unstable growth of inclined shear cracks.
1. 서 론
2. 대구경 합성 PHC말뚝의 전단 설계
2.1 대구경 PHC말뚝의 전단강도
2.2 속채움 콘크리트의 전단강도
2.3 전단철근의 전단강도
3. 대구경 합성 PHC말뚝 제작 및 시험 방법
3.1 사용재료
3.2 시험체 제작
3.3 전단시험 방법
4. 시험결과 및 분
4.1 전단시험체의 균열 및 파괴양상
4.2 최대 전단 하중
4.3 하중-변위 관계와 설계 전단강도 안전율
5. 결 론
감사의 글
References
