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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.13 No.7
- 발행연도
- 2019.11
- 수록면
- 867 - 885 (19page)
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초록· 키워드
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The study reported herein aims at investigating the behavior of medium-scale circular reinforced concrete columns wrapped with fiber reinforced polymer (FRP) sheets under concentric and eccentric axial loads. The experimental program was devised to assess the effects of loading conditions, absence/presence of an FRP jacket as well as the FRP wrapping system. To achieve the study objectives, four column groups were tested under axial compression at 0, 25, 50 and 65 mm loading eccentricities corresponding to eccentricity-to-diameter ratios of 0, 0.13, 0.26 and 0.34, respectively. Specimens in a fifth group were tested in pure bending simulating axial compression at infinite loading eccentricities. Three column subcategories were tested under each of the 5 loading eccentricities: unwrapped; wrapped with one ply of hoop FRP sheets; and wrapped with two FRP plies with fibers oriented at 0 and 90° to the longitudinal column axis thereby providing externally-bonded longitudinal reinforcement and hoop confinement, respectively. Tests confirmed that FRP confinement enhances the axial–flexural column resistance even at large eccentricities that exceed the balanced state of unconfined columns. Although axial column resistance decreased with increasing bending moments, relative enhancements (25–35%) in axial resistance provided by FRP confinement were found to be more significant under eccentric loading than in pure compression. Compared to hoop FRP-confined columns, using additional longitudinal sheets resulted in minor (7–9%) but stable enhancements in axial resistance that were unaffected by the increase in loading eccentricity. The FRP hoop wraps had a minor effect on the flexural resistance of specimens tested in pure bending but managed to double their resistance when combined with the externallybonded longitudinal FRP sheets. Finally, three stress–strain models of FRP-confined concrete were used in conventional section analysis to assess the axial–flexural interaction in the FRP-jacketed columns. Strength predictions made using the stress–strain model proposed in ACI 440.2R-17 design guidelines did not agree with the test results of the eccentrically-loaded columns and underestimated the moment resistance at a given axial force even when considering higher confinement ratios than those permitted by the guidelines. Strength predictions made using eccentricitydependent stress–strain models showed better results especially when accounting for the increase in ultimate axial strains under eccentric loading.
목차
Abstract
1. Introduction
2. Testing Program
3. Experimental Results and Discussion
4. Theoretical P–M Interaction Diagrams
5. Conclusions
References
참고문헌 (46)
참고문헌 신청
ACI 211.1-91. (1991). Standard practice for selecting properties for normal, heavyweight and mass concrete (reapproved 2009). Farmington Hills, MI: American Concrete Institute.
ACI 318-14. (2014). Building code requirements for structural concrete and commentary. Farmington Hills, MI: American Concrete Institute.
ACI 440.2R-17. (2017). Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures. Farmington Hills: American Concrete Institute.
Al-Nimry, H., & Neqresh, M. (2019). Confinement effects of unidirectional CFRP sheets on axial and bending capacities of square RC columns. Engineering Structures. https ://doi.org/10.1016/j.engst ruct.2019.10932 9.
Al-Nimry, H., & Soman, A. (2018). On the slenderness and FRP confinement of eccentrically-loaded circular RC columns. Engineering Structures, 164C, 92?108.
ACI 318-14. (2014). Building code requirements for structural concrete and commentary. Farmington Hills, MI: American Concrete Institute.
ACI 440.2R-17. (2017). Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures. Farmington Hills: American Concrete Institute.
Al-Nimry, H., & Neqresh, M. (2019). Confinement effects of unidirectional CFRP sheets on axial and bending capacities of square RC columns. Engineering Structures. https ://doi.org/10.1016/j.engst ruct.2019.10932 9.
Al-Nimry, H., & Soman, A. (2018). On the slenderness and FRP confinement of eccentrically-loaded circular RC columns. Engineering Structures, 164C, 92?108.
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