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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.11 No.3
- 발행연도
- 2017.9
- 수록면
- 477 - 487 (11page)
이용수
초록· 키워드
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The restrained thermal expansion of a pretensioned strand causes thermal prestress loss during steam curing until sufficient bond strength develops. The amount of thermal prestress loss is directly related to the characteristics of the interfacial bond stress-slip relationship at different maturity phases of concrete. For a rational assessment, the bond stress-slip relationship needs to be investigated experimentally at different maturity phases. In this study, a total of 12 pull-out tests were performed using seven-wire strand of 12.7 mm diameter, at different concrete equivalent ages of 7.8, 23.5, 53.8 and 85.2 h. Based on the test results, an empirical model of the bond stress-slip relationship was developed. The model comprised four segments: a curvilinear ascending region, a constant maximum region, a linearly descending region, and a region of constant frictional bond stress. The characteristic values in the model were expressed as functions of equivalent age. The model was able to predict the test results with reasonable accuracy.
목차
Abstract
1. Introduction
2. Experiments
3. Modeling of Bond Stress-Slip Relationships
4. Conclusions
References
참고문헌 (39)
참고문헌 신청
Ahlborn, T. M., French, C. E., & Shield, C. K. (2000). Highstrength concrete prestressed bridge girders: Long term and flexural behavior. University of Minnesota Digital Conservancy.
ASTM C1074-11. (2011). Standard practice for estimating concrete strength by the maturity method. ASTM International.
Barr, P. J., Stanton, J. F., & Eberhard, M. O. (2005). Effects of temperature variations on precast, prestressed concrete bridge girders. Journal of Bridge Engineering, 10(2), 186?194.
Bernhardt, C. J. (1956). Hardening of concrete at different temperatures. In RILEM symposium on winter concreting. Session B-II. Copenhagen: Danish Institute for Building Research.
Brown, T. L., & LeMay, H. E. (1988). Chemistry: The central science (4th ed., pp. 494?498). Englewood Cliffs, NJ: Prentice Hall.
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