Earthquakes and Structures

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Comparative experimental assessment of seismic rehabilitation with CFRP strips and sheets on RC frames

  • Kakaletsis, D.J. (Department of Civil Engineering, Technological Educational Institution of Central Macedonia)
  • Received : 2015.08.31
  • Accepted : 2016.01.28
  • Published : 2016.03.25
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Abstract

The effectiveness of the use of modern repair schemes for the seismic retrofit of existing RC structures were assessed on a comparative experimental study of carbon fiber-reinforced polymer (CFRP) strips and sheets for the repair of reinforced concrete members of RC frames, damaged because of cyclic loading. Two virgin, single - story, one - bay, 1/3 - scale frame specimens were tested under cyclic horizontal loading, up to a drift level of 4%. Then, virgin specimens, B and F, respectively, were repaired and retested in the same way. One, specimen RB, was repaired with epoxy injections and CFRP strips and one, specimen RF, was repaired with epoxy injections and CFRP sheets. The two specimens are used to examine the differences between the structural behavior of frames repaired using CFRP strips and frames repaired using CFRP sheets. Both qualitative and quantitative conclusions, based on the observed maximum loads, loading and reloading stiffness, hysteretic energy absorption and failure mechanisms are presented and compared. The repaired frames recovered their strength, stiffness and energy dissipated reasonably. The use of CFRP sheets was found more effective than CFRP strips, due to the proper anchorage.

Keywords

References

  1. ACI Committee 440.2R (2002), Guide for the Design and Construction of Externally Bonded FRP systems for strengthening Concrete Structures, American Concrete Institute, Farmington Hills, MI, USA.
  2. Antonopoulos, C.P. and Triantafillou, T.C. (2003), "Experimental investigation of FRP-strengthened RC beam-column joints", J. Compos. Constr., ASCE, 7(1), 39-49. https://doi.org/10.1061/(ASCE)1090-0268(2003)7:1(39)
  3. Bousias, N.S., Triantafillou, C.T., Fardis, N.M., Spathis, L. and O'Regan, A.B. (2004), "Fiber-reinforced polymer retrofitting of rectangular reinforced concrete columns with or without corrosion", Struct. J., 101(4), 512-520.
  4. Della Corte, G.D., Barecchia, E. and Mazzolani, F.M. (2006), "Seismic upgrading of RC buildings by FRP: Full-scale tests of a real structure", J. Mater. Civ. Eng., 18 (5), 659-669. https://doi.org/10.1061/(ASCE)0899-1561(2006)18:5(659)
  5. Di Ludovico, M., Balsamo, A., Prota, A. and Manfredi, G. (2008a), "Comparative assessment of seismic rehabilitation techniques on a Full-Scale 3-Story RC moment frame structure", Struct. Eng. Mech., 28(6), 727-747. https://doi.org/10.12989/sem.2008.28.6.727
  6. Di Ludovico, M., Prota, A., Manfredi, G. and Cosenza, E. (2008b), "Seismic strengthening of an underdesigned RC structure with FRP", Earthq. Eng. Struct. Dyn., 37(1), 141-162. https://doi.org/10.1002/eqe.749
  7. Engindeniz, M., Kahn, L.F. and Zureick, A.H. (2005), "Repair and strengthening of reinforced concrete beam-column joints: State of the art", ACI Struct. J., 102(2), 187-197.
  8. Eurocode 8 (2005), Design of structures for earthquake resistance, Part 3: Assessment and retrofitting of buildings, European Standard EN 1998-3, CEN (European Committee for Standardization), Brusells.
  9. Fardis, M.N. (2009), Seismic Design, Assessment and Retrofitting of Concrete Buildings, based on ENEurocode 8, Series: Geotechnical, Geological, and Earthquake Engineering, Springer, New York, USA.
  10. fib Bulletin 35 (2006), Retrofitting of concrete structures through Externally bonded FRPs, with emphasis on seismic applications, Federation Internationale du Beton, Lausanne, Switzerland.
  11. Kakaletsis, D.J. (2011), "Comparison of CFRP and alternative seismic retrofitting techniques for bare and infilled RC frames", J. Compos. Constr., ASCE, 15(4), 565-577. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000196
  12. Kakaletsis, D.J. and Karayannis, C.G. (2008), "Influence of masonry strength and openings on infilled R/C frames under cycling loading", J. Earthq. Eng., 12(2), 197-221. https://doi.org/10.1080/13632460701299138
  13. Kakaletsis, D.J. and Karayannis, C.G. (2009), "Experimental investigation of infilled R/C frames with openings", ACI Struct. J., 106(2), 132-141.
  14. Karayannis, C.G. and Sirkelis, G.M. (2008), "Strengthening and rehabilitation of RC beam-column joints, using carbon-FRP jacketing and epoxy resin injection", J. Earthq. Eng. Struct. Dyn., 37(5), 769-790. https://doi.org/10.1002/eqe.785
  15. Koutas, L. and Triantafillou, T. (2013), "Use of anchors in shear strengthening of reinforced concrete Tbeams with FRP", J. Compos. Constr., 17(1), 101-107. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000316
  16. Koutas, L., Pitytzogia, A., Triantafillou, T. and Bousias, S. (2014), "Strengthening of infilled reinforced concrete frames with TRM: Study on the development and testing of textile-based anchors", J. Compos. Constr., 18(3), A4013015. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000390
  17. Lavan, O. and Levy, R. (2010), "Performance based optimal seismic retrofitting of yielding plane frames using added viscous damping", Earthq. Struct., 1(3), 307-326. https://doi.org/10.12989/eas.2010.1.3.307
  18. Li, B., Siu-shu Lam, E., Wu, B. and Ya-yong Wang, Y. (2015), "Seismic behavior of reinforced concrete exterior beam-column joints strengthened by ferrocement composites", Earthq. Struct., 9(1), 233-256. https://doi.org/10.12989/eas.2015.9.1.233
  19. Mazza, F. (2015), "Comparative study of the seismic response of RC framed buildings retrofitted using modern techniques", Earthq. Struct., 9(1), 29-48. https://doi.org/10.12989/eas.2015.9.1.029
  20. Yurdakul, O. and Avsar, O. (2015), "Structural repairing of damaged reinforced concrete beam-column assemblies with CFRPs", Struct. Eng. Mech., 54(3), 521-543. https://doi.org/10.12989/sem.2015.54.3.521

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