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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.1
- 발행연도
- 2017.3
- 수록면
- 171 - 183 (13page)
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초록· 키워드
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Strengthening reinforced concrete (RC) beams with openings by using aramid fiber reinforcement polymers (AFRP) on the beams’ surfaces offers a useful solution for upgrading concrete structures to carry heavy loads. This paper presents a repairing technique of the AFRP sheets that effectively strengthens RC beams, controls both the failure modes and the stress distribution around the beam chords and enhances the serviceability (deflection produced under working loads be sufficiently small and cracking be controlled) of pre-cracked RC beams with openings. To investigate the possible damage that was caused by the service load and to simulate the structure behavior in the site, a comprehensive experimental study was performed. Two unstrengthened control beams, four beams that were pre-cracked before the application of the AFRP sheets and one beam that was strengthened without pre-cracking were tested. Cracking was first induced, followed by repair using various orientations of AFRP sheets, and then the beams were tested to failure. This load was kept constant during the strengthening process. The results show that both the preexisting damage level and the FRP orientation have a significant effect on strengthening effectiveness and failure mode. All of the strengthened specimens exhibited higher capacities with capacity enhancements ranging from 21.8 to 66.4%, and the crack width reduced by 25.6–82.7% at failure load compared to the control beam. Finally, the authors present a comparison between the experimental results and the predictions using the ACI 440.2R-08 guidelines.
목차
Abstract
1. Introduction
2. Experimental Program
3. Experimental Results and Discussions
4. Performance of the Current Analytical Equations Used in this Study
5. Conclusion
References
참고문헌 (35)
참고문헌 신청
Abdulhameed, S. S., Wu, E., & Ji, B. (2013). Mechanical prestressing system for strengthening reinforced concrete members with prestressed carbon-fiber-reinforced polymer sheets. Journal of Performance of Constructed Facilities, 29(3), 04014081.
ACI-014. (2014). Building code requirements for structural concrete and commentary. Farmington Hills, MI.
ACI-440.2R-08. (2008). Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures. Farmington Hills, MI.
Ashour, A. F., & Rishi, G. (2000). Tests of reinforced concrete continuous deep beams with web openings. Structural Journal, 97(3), 418?426.
Aykac, B., Kalkan, I., Aykac, S., & Egriboz, Y. E. (2013). Flexural behavior of RC beams with regular square or circular web openings. Engineering Structures, 56, 2165?2174.
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UCI(KEPA) : I410-ECN-0101-2017-532-002243818