Analytical Study on Bond Characterization of Hybrid-Bonded FRP to Concrete Interfaces

Abstract:

Pure adhesive bond of FRP to concrete is not only weak but also unreliable in a long term. This problem can be effectively overcome by a newly developed bond enhancement system the hybrid bonded FRP system (HB-FRP) in which small mechanical fasteners are used to augment the bond. In this paper, theoretical modeling is reported for characterization of the interfacial bond of the HB-FRP system. Local bond-slip model involving adhesive and mechanical mechanisms is proposed. Based on the basic bond-slip model, load-slip response, ultimate bond strength, and effective bond length of the HB-FRP bond interface are obtained by analytical or numerical solution. Good agreement between the analytical and experimental results indicates that the proposed bond-slip model can well predict bond behaviors of HB-FRP joints.

• Periodical: Applied Mechanics and Materials (Volumes 405-408)
• Pages: 2528-2533
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.405-408.2528
• Online since: September 2013
• Authors: Kang Liu
• Keywords: Bond, FRP, Mechanical Fastening

References

[1] H.N. Garden, L.C. Hollaway. An experimental study of the influence of plate end anchorage of carbon fibre composite plates used to strengthen reinforced concrete beams. Composite Structures, 42: 175-188 (1998).

DOI: 10.1016/s0263-8223(98)00070-1

[2] G. Spadea, F. Bencardino, R.N. Swamy. Structural behaviour of composite beams with externally bonded CFRP. Journal of Composites for Construction, ASCE, 2: 132-137 (1998).

DOI: 10.1061/(asce)1090-0268(1998)2:3(132)

[3] J.G. Teng, J.F. Chen, S.T. Smith, L. Lam, T. Jessop. Behaviour and strength of FRP-strengthened RC structures: a state-of-the-art review. Proceedings of the Institution of Civil Engineers-Structures and Buildings, 156: 334-335 (2003).

DOI: 10.1680/stbu.2003.156.3.334

[4] J.G. Teng, L. Lam, W. Chan, J. Wang. Retrofitting of deficient RC cantilever slabs using GFRP strips. Journal of Composites for Construction ASCE, 4: 75-84 (2000).

DOI: 10.1061/(asce)1090-0268(2000)4:2(75)

[5] S.F. Brena, R.M. Bramblett, S.L. Wood, M.E. Kreger. Increasing flexural capacity of reinforced concrete beams using carbon fiber-reinforced polymer composites. ACI Structural Journal, 100: 36-46 (2003).

DOI: 10.14359/12437

[6] L. De Lorenzis, A. Nanni. Characterization of FRP rods as near-surface mounted reinforcement. Journal of Composites for Construction ASCE, 5: 114-121 (2001).

DOI: 10.1061/(asce)1090-0268(2001)5:2(114)

[7] A.J. Lamanna, L.C. Bank, D.T. Borowicz. Mechanically fastened FRP strengthening of large scale RC bridge T beams. Advances in Structural Engineering, 7: 525-538 (2004).

DOI: 10.1260/1369433042863206

[8] Y.F. Wu, Y. Huang. Hybrid bonding of FRP to reinforced concrete structures. Journal of Composites for Construction, ASCE, 12: 266-273 (2008).

DOI: 10.1061/(asce)1090-0268(2008)12:3(266)

[9] Y.F. Wu, J.H. Yan, Y.W. Zhou, Y. Xiao. Ultimate strength of reinforced concrete beams retrofitted with hybrid bonded fiber-reinforced polymer. ACI Structural Journal, 107: 451-460 (2010).

DOI: 10.14359/51663818

[10] K. Liu. Experimental Study on Bond Characterization of Hybrid-bonded FRP to Concrete Interfaces: submitted to Advanced Materials Research (2013).

DOI: 10.4028/www.scientific.net/amr.790.375

[11] Y.W. Zhou, Y.F. Wu, Y Yun. Analytical modeling of the bond-slip relationship at FRP-concrete interfaces for adhesively-bonded joints. Composites Part B: Engineering, 41: 423-33 (2010).

DOI: 10.1016/j.compositesb.2010.06.004

[12] J.G. Dai, T. Ueda, Y. Sato. Unified analytical approaches for determining shear bond characteristics of FRP-concrete interfaces through pullout tests. Journal of Advanced Concrete Technology, 4: 133-45 (2006).

DOI: 10.3151/jact.4.133

[13] J.G. Dai, T. Ueda, Y. Sato. Development of the nonlinear bond stress-slip model of fiber reinforced plastics sheet-concrete interfaces with a simple method. Journal of Composites for Construction ASCE, 9: 52-62 (2005).

DOI: 10.1061/(asce)1090-0268(2005)9:1(52)

[14] K. Liu. Computational Modeling, Experimental and Theoretical Study on Bond Behaviors of Hybrid-Bonded FRP Strengthened Concrete Structures, PhD thesis, Department of Civil & Architectural Engineering, City University of Hong Kong (2011).