Steel and Composite Structures

  • 제15권6호
  • /
  • Pages.605-621
  • /
  • 2013
  • /
  • 1229-9367(pISSN)
  • /
  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

An Investigation of fan type anchorages applied to end of CFRP strips

  • Kara, M. Emin (Aksaray University, Civil Engineering Department) ;
  • Yasa, Mustafa (Aksaray University, Civil Engineering Department)
  • 투고 : 2011.12.06
  • 심사 : 2013.08.31
  • 발행 : 2013.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

CFRP strips are widely used nowadays for repair/strengthening or capacity increase purposes. Sharp bending at the ends of the CFRP strips is frequently encountered at these applications. In this study, Reinforced Concrete (RC) beam specimens that were produced with 10 MPa compression strength concrete were strengthened by using bonded CFRP strips with end anchorages to tension region. The parameters that were investigated in this study are the width of the strip, the number of applied fan anchorages and whether additional layer of CFRP patch is used or not at the strip ends. Specimens were strengthened with 100 mm wide CFRP strips with one or two anchorages at the ends. In addition CFRP patch with two and three anchorages at the ends were tested for investigating the effect of the patches. Specimens that were strengthened with three anchorages at the ends with patches were repeated with 60 and 80 mm wide CFRP strips. The most successful result was obtained from the specimen that was strengthened with 80 mm wide CFRP strips with 3 end anchorages and patches among the others at the experimental program. The numbers of anchorages that were applied to ends of CFRP strips were more effective than the width of the CFRP strips onto strength and stiffness of the specimens. Due to limited space at the ends of the strips at most three anchorages could be applied.

키워드

참고문헌

  1. ACI Committee 440 (2008), "Guide for the design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures", American Concrete Inst., Michigan, NY. USA.
  2. Altin, S., Anil, O., Kara, M.E. and Kaya, M. (2008), "An experimental study on strengthening of masonry infilled R/C frames using diagonal CFRP strips", Composi. Part B: Eng., 39(4), 680-693. https://doi.org/10.1016/j.compositesb.2007.06.001
  3. Altin, S., Anil, O., Kopraman, Y., Mertoglu, C. and Kara, M.E. (2010), "Improving shear capacity and ductility of shear-deficient RC beams using CFRP strips", J. Reinf. Plast. Comp., 29(19), 2975-2991. https://doi.org/10.1177/0731684410363182
  4. Anil, O. (2008), "Strengthening of RC T-section beams with low strength concrete using CFRP composites subjected to cyclic load", Constr. Build. Mater., 22(12), 2355-2368. https://doi.org/10.1016/j.conbuildmat.2007.10.003
  5. Anil, O., Belgin, C. and Kara, M.E. (2010), "Experimental investigation on CFRP to concrete bonded joints across crack", Struct. Eng. Mech., Int. J., 35(1), 1-18. https://doi.org/10.12989/sem.2010.35.1.001
  6. Belarbi, A., Bae, S-W. and Brancaccio, A. (2011), "Behavior of full-scale RC T-beams strengthening in shear with externally bonded FRP sheets", Constr. Build. Mater. [In Press]
  7. Camli, U.S. and Binici, B. (2007), "Strength of carbon fiber reinforced polymers bonded to concrete and masonry", Constr. Build. Mater., 21(7) 1431-1446. https://doi.org/10.1016/j.conbuildmat.2006.07.003
  8. Ceroni, F. and Pecce, M. (2010), "Evaluation of bond strength in concrete elements externally reinforced with CFRP sheets and anchoring devices", J. Compos. Construct., ASCE, 14(5), 521-530. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000118
  9. El-Ghandour, A.A. (2011), "Experimental and analytical investigation of CFRP flexural and shear strengthening efficiencies of RC beams", Constr. Build. Mater., 25(3) 1419-1429. https://doi.org/10.1016/j.conbuildmat.2010.09.001
  10. Ferracuti, B., Savoia, M. and Mazzotti, C. (2007), "Interface law for FRP-concrete delamination", Compos. Struct., 80(4), 523-531. https://doi.org/10.1016/j.compstruct.2006.07.001
  11. Kalfat, R. and Al-Mahaidi, R. (2010), "Investigation into bond behavior of a new CFRP anchorage systems for concrete utilizing a mechanically strengthening substrate", Compos. Struct., 92(11), 2738-2746. https://doi.org/10.1016/j.compstruct.2010.04.004
  12. Ozcebe, G., Ersoy, U., Tankut, T., Erduran, E., Keskin, S.O. and Mertol, C.H. (2003), "Strengthening of brick-infilled RC frames with CFRP", Structural Engineering Research Unit, Tubitak-Metu, NATO Scientific Affairs Division (Grant No: NATO Sfp977231).
  13. Simith, S.T., Hu, S., Kim, S.J. and Seracino, R. (2011), "FRP-strengthened RC slabs anchored with FRP anchors", Eng. Struct., 33(4), 1075-1087. https://doi.org/10.1016/j.engstruct.2010.11.018
  14. Turkish Seismic Code (2007), Ministry of Public Work, Ankara.

피인용 문헌

  1. Nonlinear three-dimensional FE analyses of RC beams retrofitted using externally bonded CFRP sheets with or without anchorages vol.31, pp.7, 2017, https://doi.org/10.1080/01694243.2016.1232040