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http://dx.doi.org/10.12989/scs.2013.15.6.623

Flexural behaviour of CFST members strengthened using CFRP composites  

Sundarraja, M.C. (Thiagarajar College of Engineering)
Prabhu, G. Ganesh (Sethu Institute of Technology)
Publication Information
Steel and Composite Structures / v.15, no.6, 2013 , pp. 623-643 More about this Journal
Abstract
Concrete filled steel tubular members (CFST) become a popular choice for modern building construction due to their numerous structural benefits and at the same time aging of those structures and member deterioration are often reported. Therefore, actions like implement of new materials and strengthening techniques become essential to combat this problem. The application of carbon fibre reinforced polymer (CFRP) with concrete structures has been widely reported whereas researches related to strengthening of steel structures using fibre reinforced polymer (FRP) have been limited. The main objective of this study is to experimentally investigate the suitability of CFRP to strengthening of CFST members under flexure. There were three wrapping schemes such as Full wrapping at the bottom (fibre bonded throughout entire length of beam), U-wrapping (fibre bonded at the bottom throughout entire length and extended upto neutral axis) and Partial wrapping (fibre bonded in between loading points at the bottom) introduced. Beams strengthened by U-wrapping exhibited more enhancements in moment carrying capacity and stiffness compared to the beams strengthened by other wrapping schemes. The beams of partial wrapping exhibited delamination of fibre and were failed even before attaining the ultimate load of control beam. The test results showed that the presence of CFRP in the outer limits was significantly enhanced the moment carrying capacity and stiffness of the beam. Also, a non linear finite element model was developed using the software ANSYS 12.0 to validate the analytical results such as load-deformation and the corresponding failure modes.
Keywords
CFST members; CFRP fabrics; strengthening; flexure; externally bonded;
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1 Jiao, H. and Zhao, X.L. (2004), "CFRP strengthened butt-welded very high strength (VHS) circular steel tubes", Thin-Wall. Struct., 42(7), 963-978.   DOI   ScienceOn
2 Miller, T.C., Chajes, M.J., Mertz, D.R. and Hastings, J.N. (2001), "Strengthening of a steel bridge girder using CFRP plates", ASCE J Bridge Eng., 6(6), 514-522.   DOI
3 Photiou, N.K., Hollaway, L.C. and Chryssanthopoulos, M.K. (2006), "Strengthening of an Artificially Degraded Steel Beam Utilizing a Carbon/Glass Composite System", Constr. Build. Mater., 20(1-2), 11-21.   DOI   ScienceOn
4 Peters, S. (1998), Handbook of Composites, Chapman & Hall, London, UK.
5 Reinhart, T.J. (1998), Overview of Composite Materials, Chapman & Hall, London, UK.
6 Seica, M.V. and Packer, J.A. (2007), "FRP materials for the rehabilitation of tubular steel structures, for underwater applications", Compos. Struct., 80(3), 440-450.   DOI   ScienceOn
7 Sen, R. and Liby, L. (1994), "Repair of steel composite bridge sections using CFRP laminates", U.S. Department of Transportation Contract B-7932, University of South Florida, Tampa, FL, USA.
8 Shaat, A. and Fam, A. (2006), "Axial loading tests on CFRP-retrofitted short and long HSS steel columns", Can. J. Civil Eng., 33(4), 458-470.   DOI   ScienceOn
9 Shaat A., Schnerch, D., Fam, A. and Rizkalla, S. (2004), "Retrofit of steel structures using fiber-reinforced polymers (FRP): State-of-the-art", Transportation Research Board (TRB) Annual Meeting, Washington, January.
10 Tao, Z. and Han, L.H. (2007), "Behaviour of fire-exposed concrete-filled steel tubular beam columns repaired with CFRP wraps", Thin-Wall. Struct., 45(1), 63-76.   DOI   ScienceOn
11 Tao, Z., Han, L.H. and Zhuang, J.P. (2008), "Cyclic performance of fire-damaged concrete-filled steel tubular beam-columns repaired with CFRP wraps", J. Constr. Steel Res., 64(1), 37-50.   DOI   ScienceOn
12 Teng, J.G., Chen, J.F., Smith, S.T. and Lam, L. (2001), FRP-Strengthened RC Structures, John Wiley & Sons, West Sussexm.
13 Zhao, X.L. and Zhang, L. (2007), "State of the art review on FRP strengthened steel structures", Eng. Struct., 29(8), 1808-1823.   DOI   ScienceOn
14 Zhao, X.L., Fernando, D. and Al-Mahaidi, R. (2006), "CFRP strengthened RHS subjected to transverse end bearing force", Eng. Struct., 28(11), 1555-1565.   DOI   ScienceOn
15 Haedir, J. and Zhao, X.L. (2010), "Design of short CFRP-reinforced steel tubular columns", J. Constr. Steel Res., 67(3), 497-509.
16 Haedir, J., Bambach, M.R., Zhao, X.L. and Grzebieta, R.H. (2009), "Strength of circular hollow sections (CHS) tubular beams externally reinforced by carbon FRP sheets in pure bending", Thin-Wall. Struct., 47(10), 1136-1147.   DOI   ScienceOn
17 Hollaway, L. (1993), Polymer Composites for Civil and Structural Engineering, Blackie Academic and Professional, Glasgow, UK.
18 Balazs, G.L. and Borosnyoi, A. (2001), "Long-term behavior of FRP", Proceedings of the International Workshop on Composites in Construction: A Reality, American Society of Civil Engineers, VA, 84-91.
19 De Nardin, S. and El Debs, A.L.H.C. (2007), "Axial load behaviour of concrete-filled Steel tubular columns", Proceedings of the Institution of Civil Engineers - Structures & Buildings, February, 160(1), SB1 13-22.   DOI   ScienceOn
20 Hollaway, L. (1994), Handbook of Polymer Composites for Engineers, Woodhead Publishing Ltd., Cambridge, UK.
21 Hollaway, L.C. and Cadei, J. (2002), "Progress in the technique of upgrading metallic structures with advanced polymer composites", Progress in Struct. Eng. Mater., 4(2), 131-148.   DOI   ScienceOn