Earthquakes and Structures

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Strengthening of non-seismically designed beam-column joints by ferrocement jackets with chamfers

  • Li, Bo (Department of Civil & Environmental Engineering, The Hong Kong Polytechnic University) ;
  • Lam, Eddie Siu-Shu (Department of Civil & Environmental Engineering, The Hong Kong Polytechnic University) ;
  • Cheng, Yuk-Kit (Department of Civil & Environmental Engineering, The Hong Kong Polytechnic University) ;
  • Wu, Bo (School of Civil Engineering & Transportation, South China University of Technology) ;
  • Wang, Ya-Yong (Institute of Earthquake Engineering, China Academy of Building Research)
  • Received : 2014.04.11
  • Accepted : 2014.08.15
  • Published : 2015.05.25
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Abstract

This paper presents a strengthening method that involves the use of ferrocement jackets and chamfers to relocate plastic hinge for non-seismically designed reinforced concrete exterior beam-column joints. An experimental study was conducted to assess the effectiveness of the proposed strengthening method. Four half-scale beam-column joints, including one control specimen and three strengthened specimens, were prepared and tested under quasi-static cyclic loading. Strengthening schemes include ferrocement jackets with or without skeleton reinforcements and one or two chamfers. Experimental results have indicated that the proposed strengthening method is effective to move plastic hinge from the joint to the beam and enhance seismic performance of beam-column joints. Shear stress and distortion within the joint region are also reduced significantly in strengthened specimens. Skeleton reinforcements in ferrocement provide limited improvement, except on crack control. Specimen strengthened by ferrocement jackets with one chamfer exhibits slight decrease in peak strength and energy dissipation but with increase in ductility as compared with that of two chamfers. Finally, a method for estimating moment capacity at beam-column interface for strengthened specimen is developed. The proposed method gives reasonable prediction and can ensure formation of plastic hinge at predetermined location in the beam.

Keywords

References

  1. Abdel-Fattah, B. and Wight, J.K. (1987), "Study of moving beam plastic hinging zones for earthquakeresistant design of R/C buildings", ACI Struct. J., 84(1), 31-39.
  2. ACI-ASCE 352R-02 (2002), Recommendations for Design of Beam-column Connections in Monolithic Reinforced Concrete Structures, American Concrete Institute, Farmington Hills, MI.
  3. ACI 549R (1997), State-of-the-Art Report on Ferrocement, ACI Committee 549, Detroit, MI.
  4. ACI 318-11 (2011), Building Code Requirements for Structural Concrete (ACI 318-11) and Commentary, American Concrete Institute, Farmington Hills, MI.
  5. Alcocer, S.M. and Jirsa, J.O. (1993), "Strength of reinforced-concrete frame connections rehabilitated by jacketing", ACI Struct. J., 90(3), 249-261.
  6. Alsayed, S.H., Al-Salloum, Y.A., Almusallam, T.H. and Siddiqui, N.A. (2010), "Seismic response of FRPupgraded exterior RC beam-column joints", J. Compos. Constr., 14(2), 195-208. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000067
  7. Antonopoulos, C.P. and Triantafillou, T.C. (2003), "Experimental investigation of FRP-strengthened RC beam-column joints", J. Compos. Constr., 7(1), 39-49. https://doi.org/10.1061/(ASCE)1090-0268(2003)7:1(39)
  8. ASCE/SEI 41 (2007), Seismic Rehabilitation of Existing Buildings, American Society of Civil Engineers, Reston, VA.
  9. Bousselham, A. (2010), "State of research on seismic retrofit of RC beam-column joints with externally bonded FRP", J. Compos. Constr., 14(1), 49-61. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000049
  10. Chaimahawan, P. and Pimanmas, A. (2009), "Seismic retrofit of substandard beam-column joint by planar joint expansion", Mater. Struct., 42(4), 443-459. https://doi.org/10.1617/s11527-008-9393-7
  11. Chutarat, N. and Aboutaha, R.S. (2003), "Cyclic response of exterior reinforced concrete beam-column joints reinforced with headed bars - experimental investigation", ACI Struct. J., 100(2), 259-264.
  12. Copconcrete (1987), Code of Practice for the Structural Use of Concrete-1987, Buildings and Lands Department, Hong Kong.
  13. 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.
  14. Genesio, G., Eligehausen, R. and Pampanin, S. (2011), "Application of post-installed anchors for seismic retrofit of RC beam-column joints: design method", Proceeding of the 9th Pacific Conference on Earthquake Engineering Building an Earthquake-Resilient Society, Auckland, New Zealand.
  15. Ghobarah, A., Aziz, T.S. and Biddah, A. (1997), "Rehabilitation of reinforced concrete frame connections using corrugated steel jacketing", ACI Struct. J., 94(3), 283-294.
  16. Ghobarah, A. and Said, A. (2002), "Shear strengthening of beam-column joints", Eng. Struct., 24(7), 881-888. https://doi.org/10.1016/S0141-0296(02)00026-3
  17. Hakuto, S., Park, R. and Tanaka, H. (2000), "Seismic load tests on interior and exterior beam-column joints with substandard reinforcing details", ACI Struct. J., 97(1), 11-25.
  18. Ilki, A., Bedirhanoglu, I. and Kumbasar, N. (2011), "Behavior of FRP-retrofitted joints built with plain bars and low-strength concrete", J. Compos. Constr., 15(3), 312-326. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000156
  19. Kam, W.Y., Pampanin, S. and Elwood, K. (2011), "Seismic performance of reinforced concrete buildings in the 22 February Christchurch (Lyttelton) earthquake", Bull. NZ. Soc. Earthq. Eng., 44(4), 239-278.
  20. Karayannis, C.G., Chalioris, C.E. and Sideris, K.K. (1998), "Effectiveness of RC beam-column connection repair using epoxy resin injections", J. Earthq. Eng., 2(2), 217-240. https://doi.org/10.1080/13632469809350320
  21. Karayannis, C.G. and Sirkelis, G.M. (2008), "Strengthening and rehabilitation of RC beam-column joints using carbon-FRP jacketing and epoxy resin injection", Earthq. Eng. Struct. Dyn., 37(5), 769-790. https://doi.org/10.1002/eqe.785
  22. Karayannis, C.G., Chalioris, C.E. and Sirkelis, G.M. (2008), "Local retrofit of exterior RC beam-column joints using thin RC jackets - an experimental study", Earthq. Eng. Struct. Dyn., 37(5), 727-746. https://doi.org/10.1002/eqe.783
  23. Lam, S.S.E., Xu, Y.L., Chau, K.T., Wong, Y.L. and Ko, J.M. (2002), "Progress in earthquake resistant design of buildings in Hong Kong", Proceeding of Structural Engineering World Congress, Yokohama, Japan.
  24. Li, B. and Chua, H.Y.G. (2009), "Seismic performance of strengthened reinforced concrete beam-column joints using FRP composites", J. Struct. Eng., ASCE, 135(10), 1177-1190. https://doi.org/10.1061/(ASCE)0733-9445(2009)135:10(1177)
  25. Li, B. and Qian, K. (2011), "Seismic behavior of reinforced concrete interior beam-wide column joints repaired using FRP", J. Compos. Constr., 15(3), 327-338. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000163
  26. Li, B., Lam, E.S.S., Wu, B. and Wang, Y.Y. (2013), "Experimental investigation on reinforced concrete interior beam-column joints rehabilitated by ferrocement jackets", Eng. Struct., 56, 897-909. https://doi.org/10.1016/j.engstruct.2013.05.038
  27. Mahini, S.S. and Ronagh, H.R. (2011), "Web-bonded FRPs for relocation of plastic hinges away from the column face in exterior RC joints", Compos. Struct., 93(10), 2460-2472. https://doi.org/10.1016/j.compstruct.2011.04.002
  28. Naaman, A.E. (2000), Ferrocement and Laminated Cementitious Composites, Techno Press 3000.
  29. Pampanin, S., Christopoulos, C. and Chen, T.H. (2006), "Development and validation of a metallic haunch seismic retrofit solution for existing under-designed RC frame buildings", Earthq. Eng. Struct. Dyn., 35(14), 1739-1766. https://doi.org/10.1002/eqe.600
  30. Pantelides, C.P., Okahashi, Y. and Reaveley, L.D. (2008), "Seismic rehabilitation of reinforced concrete frame interior beam-column joints with FRP composites", J. Compos. Constr., 12(4), 435-445. https://doi.org/10.1061/(ASCE)1090-0268(2008)12:4(435)
  31. Park, R. (1989), "Evaluation of ductility of structures and structural assemblages from laboratory testing", Bull. NZ. Soc. Earthq. Eng., 22(3), 155-166.
  32. Paulay, T. and Priestley, M.J.N. (1992), Seismic Design of Reinforced Concrete and Masonry Buildings, A Wiley Interscience publication, John Wiley & Sons, INC.
  33. Pimanmas, A. and Chaimahawan, P. (2010), "Shear strength of beam-column joint with enlarged joint area", Eng. Struct., 32(9), 2529-2545. https://doi.org/10.1016/j.engstruct.2010.04.021
  34. Prota, A., Nanni, A., Manfredi, G. and Cosenza, E. (2004), "Selective upgrade of underdesigned reinforced beam-column joints using carbon fiber-reinforced concrete", ACI Struct. J., 101(5), 699-707.
  35. Sasmal, S., Ramanjaneyulu, K., Novak, B., Srinivas, V., Kumar, K. S., Korkowski, C., Roehm, C., Lakshmanan, N. and Iyer, N.R. (2011), "Seismic retrofitting of nonductile beam-column sub-assemblage using FRP wrapping and steel plate jacketing", Constr. Build. Mater., 25(1), 175-182. https://doi.org/10.1016/j.conbuildmat.2010.06.041
  36. Sezen, H., Whittaker, A.S., Elwood, K.J. and Mosalam, K.M. (2003), "Performance of reinforced concrete buildings during the August 17, 1999 Kocaeli, Turkey earthquake, and seismic design and construction practise in Turkey", Eng. Struct., 25(1), 103-114. https://doi.org/10.1016/S0141-0296(02)00121-9
  37. Sezen, H. (2012), "Repair and strengthening of reinforced concrete beam-column joints with fiberreinforced polymer composites", J. Compos. Constr., 16(5), 499-506. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000290
  38. Su, R.K.L. and Wong, S.M. (2007), "A survey on axial load ratios of structural walls in medium-rise residential buildings in Hong Kong", HKIE Tran., 14(3), 40-46.
  39. Yi, W.H., You, Y.C. and Lee, L.H. (1996), "Moving and spreading beam plastic hinging zones for the ductile behavior of high-strength beam plastic hinging zones for the ductile behavior of high-strength reinforced concrete beam", Proceeding of 11th World Conference on Earthquake Engineering, Paper No. 384.

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