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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.12 No.4
- 발행연도
- 2018.5
- 수록면
- 425 - 437 (13page)
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초록· 키워드
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This study aimed to investigate the bond properties of prestressing strands embedded in ultra-high-performance fiberreinforced concrete (UHPFRC). Toward this end, two types of prestressing strands with diameters of 12.7 and 15.2 mm were considered, along with various concrete cover depths and initial prestressing force magnitudes. The average bond strength of the strands in UHPFRC was estimated by using pullout tests, and the transfer length was evaluated based on a 95% average maximum strain method. Test results indicated that the average bond strength of the pretensioned strand reduced as the diameter of the strand increased, and was between the bond strengths of round and deformed steel rebars. Higher bond strength was also obtained with a lower embedment length. Based on a comparison of p value, the bar diameter and embedment length most significantly influenced the bond strength of strands in UHPFRC, compared to a ratio of cover depth to diameter and initial prestressing force. Pretensioned strands in UHPFRC exhibited much higher bond strength and shorter transfer length compared with strands embedded in ordinary high-strength concrete. Lastly, ACI 318 and AASHTO LRFD codes significantly overestimated the transfer length of the strands embedded in UHPFRC.
목차
Abstract
1. Introduction
2. Test Program
3. Bond Strengths of Pretensioned Strand in UHPFRC
4. Transfer Length
5. Conclusions
References
참고문헌 (47)
참고문헌 신청
AASHTO. (2012). AASHTO LRFD bridge design specifications, Customary U.S. Units (6th ed.). Washington, DC: American Association of State Highway and Transportation Officials (AASHTO).
Abrishami, H. G., & Mitchell, D. (1993). Bond characteristics of pretensioned strand. ACI Materials Journal, 90(3), 228?235.
Abrishami, H. H., & Mitchell, D. (1996). Analysis of bond stress distributions in pullout specimens. Journal of Structural Engineering, 122(3), 255?261.
ACI Committee 318. (2014). Building code requirements for structural concrete (ACI 318-14) and commentary 9 (318R- 14). Farmington Hills: American Concrete Institute.
ASTM A416. (2015). Standard specification for low-relaxation, seven-wire steel strand for prestressed concrete (pp. 1?5). West Conshohocken, PA: ASTM International.
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