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논문 기본 정보

자료유형
학술저널
저자정보
Sang‑Hyun Kim (Daewoo Institute of Construction Technology) Sung Yong Park (Korea Institute of Civil Engineering and Building Technology) Sung Tae Kim (Korea Institute of Civil Engineering and Building Technology) Se‑Jin Jeon (Ajou University)
저널정보
한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.16 No.1
발행연도
2022.1
수록면
81 - 95 (15page)

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초록· 키워드

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The proper estimation of prestressing force (PF) distribution is critical to ensure the safety and serviceability of prestressed concrete (PSC) structures. Although the PF distribution can be theoretically calculated based on certain predictive equations, the resulting accuracy of the theoretical PF needs to be further validated by comparison with reliable test data. Therefore, a Smart Strand with fiber optic sensors embedded in a core wire was developed and applied to a full-scale specimen and two long-span PSC girder bridges in this study. The variation in PF distribution during tensioning and anchoring was measured using the Smart Strand and was analyzed by comparison with the theoretical distribution calculated using the predictive equations for short-term prestress losses. In particular, the provisions for anchorage seating loss and elastic shortening loss were reviewed and possible improvements were proposed. A new method to estimate the amount of anchorage slip based on real PF distributions revealed that the general assumption of 3-6-mm slip falls within a reasonable range. Finally, the sensitivity of the PF distribution to a few of the variables included in the equation of the elastic shortening loss was examined. The study results confirmed that the developed Smart Strand can be used to improve the design parameters or equations in PSC structures by overcoming the drawbacks of conventional sensing technologies.

목차

Abstract
1. Introduction
2. Configuration of the Smart Strand
3. Short-Term Losses of Prestress
4. Experimental Program of Prestressed Concrete (PSC) Structures
5. Prestressing Force (PF) Distribution During Tensioning and Anchoring
6. Additional Analysis of Short-Term Losses of Prestress
7. Conclusions
References

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