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논문 기본 정보

자료유형
학술저널
저자정보
Soo-yeon Seo (Korea National University of Transportation) Jong-wook Lim (Dawon Structural Engineering) Su-hyun Jeong (Korea National University of Transportation)
저널정보
한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.15 No.2
발행연도
2021.3
수록면
145 - 168 (24page)

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초록· 키워드

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To figure out the change in the reinforcing effect of FRP system used for the retrofit of RC beam when it is exposed to high temperature, it is required to evaluate not only the behavior of the entire beam, but also the bond performance at anchorage zone through a bond test according to the increase of external temperature. Moreover, the study to find various fire-protection methods is necessary to prevent the epoxy from reaching the critical temperature during an exposure to high temperature. In this manner, the fire-resistance performances of externally bonded (EB) FRP and near-surface-mounted (NSM) FRP to concrete block were evaluated by high-temperature exposure tests after performing a fire-protection on the surface in this paper. Board-type insulation with mortar was considered for the fire-protection of FRP system. After the fire-protection of the FRPs bonded to concrete blocks, an increasing exposure temperature was applied to the specimens with keeping a constant shear bond stress between concrete and the FRP. Based on the result, the temperature when the bond strength of the FRP disappears was evaluated. In addition, a finite element analysis was performed to find a proper method for predicting the temperature variation of the epoxy which is fire-protected with board-type insulation during the increase of external temperature. As a result of the test, despite the same fire-protection, NSM specimens were able to resist 1.54-2.08 times higher temperature than EB specimens. In the design of fire-protection of FRP system with the board-type insulation, it is necessary to consider the transfer from sides as well as the face with FRP. If there is no insulation of FP boards on the sides, the epoxy easily reaches its critical temperature by the heat penetrated to the sides, and increasing the thickness of the FP board alone for the face with FRP does not increase the fire-resistance capacity. As a result of the FE analysis, the temperature variation at epoxy can be predicted using the analytical approach with the proper thermal properties of FP mortar and board.
#bond performance #anchorage zone #externally bonded (EB) FRP #near-surface-mounted (NSM) FRP #fire-protection #board-type insulation with mortar #finite element analysis

목차

Abstract
1. Introduction
2. Evaluation on the Bond Capacity of Fire-Protected FRP Bonded to Concrete at High Temperature
3. Prediction of Temperature Transfer to FRP Through FE Analysis
4. Conclusions
References

참고문헌 (46)

참고문헌 신청
2008 / ACI Committee 440. Guide for the design and construction of exter‑nally bonded FRP systems for strengthening concrete structures (ACI 440.2R) / American Concrete Institute :12~13 google schola 2015 / ACI Committee 440. Guide for the design and construction of struc‑tural concrete reinforced with fber-reinforced polymer (FRP) bars (ACI 440.1R-15) / American Concrete Institute :12~13 google schola 2007 / ASTM E119. Standard Test Methods for Fire Tests of Building Construc‑tion and Materials google schola Ahmed, A. / 2010 / Performance of FRP-strengthened reinforced concrete beams under design fre exposure / Proceedings of the Sixth International Conference-Structures in Fire google schola Al-Mahmoud, F. / 2012 / Failure modes and failure mechanisms of RC members strengthened by NSM CFRP composites—Analysis of pull-out failure mode / Composites Part B : Engineering 43(4):1893~1901 google schola

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