Fibre reinforced polymer (FRP) plate reinforcement is a brittle material which has a brittle interfacial bond with concrete. This can lead to the misconception that all FRP retrofitting techniques provide brittle members and, hence, limited rotational capacity which has severe limitations for structural applications. This paper shows that the FRP reinforcement behaviour is but one of three components that govern the rotational capacity of plated reinforced concrete beam hinges. It is shown that FRP retrofitted beams and slabs can achieve ductile behaviour and provide rotational capacity and, furthermore, that the rotational capacity of FRP plated members depends very importantly on the interface bond characteristics.
BakerA.L.L. (1956). Ultimate Load Theory Applied to the Design of Reinforced and Prestressed Concrete Frames, Concrete Publications Ltd., London, 91.
2.
CEB. (1992). CEB-FIP Model Code 90, Thomas Telford, London.
3.
DuthinhD. (1999). “Sensitivity of shear strength of reinforced concrete and prestressed concrete beams to shear friction and concrete softening according to modified compression field theory”, ACI Structural Journal, Vol. 96, No. 4, pp. 496–508.
4.
EligehausenR.PopovE.P. and BerteroV.V. (1983). Local Bond Stress-Slip Relationship of Deformed Bars Under Generalized Excitations, UCB/EERC-83/23, Earthquake Engineering Research Center, University of California, Berkeley.
5.
FantilliA.P.FerrettiD.IoriI. and ValliniP. (1998). “Flexural deformability of reinforced concrete beams”, Journal of Structural Engineering, ASCE, Vol. 96, No. 6, pp. 1041–1049.
6.
GilbertR.I. and SakkaZ.I. (2007). “Effect of reinforcement type on the ductility of suspended reinforced concrete slabs”, Journal of Structural Engineering, ASCE, Vol. 133, No. 6, pp. 834–843.
7.
HaskettM.OehlersD.J. and Mohamed AliM.S. (2008). “Local and global bond characteristics of steel reinforcing bars”, Engineering Structures, Vol. 30, No. 2, pp. 376–383.
8.
HaskettM.OehlersD.J.AliMohamed and WuC. (2009). “Yield penetration hinge rotation in reinforced concrete beams”, Journal of Structural Engineering, Vol. 135, No. 2, pp. 130–138.
9.
HognestadE. (1951). A Study of Combined Bending and Axial Load in Reinforced Concrete Members, Engineering Expt Station Bulletin No 399, University of Illinois.
10.
HsuT.T.C.MauS.T. and ChenB. (1987). “Theory on shear transfer strength in reinforced concrete”, ACI Structural Journal, Vol. 84, No.2, pp. 149–160.
11.
MartinezS.NilsonA.H. and SlateF.O. (1984). “Spirally reinforced high-strength concrete columns”, ACI Journal, Proceedings (September-October), pp. 431–441.
12.
MattockA.H. (1967). Discussion of Rotational Capacity of Reinforced Concrete Beams, by W.D.G. Corley, Journal of Structural Division, ASCE, Vol. 93, No. 2, pp. 519–522.
13.
MattockA.H. and HawkinsN.M. (1972). “Shear transfer in reinforced concrete recent research”, PCI Journal, Vol. 17, No. 2, pp. 55–75.
14.
MattockA.H.MauS.T. and HsuT.T. (1988). “Comments on “Iifluence of concrete strength and load history on the shear friction capacity of concrete members”, PCI Journal, Vol. 33, No. 1, pp. 165–170.
15.
MattockA. (1988). “Reader comments”, PCI Journal, Vol.33, No.1, pp. 165–166.
16.
Mohamed AliM.S.OehlersD.J. and SeracinoR. (2006). “Vertical shear interaction model between external FRP transverse plates and internal steel stirrups”, Engineering Structures, Vol. 28, No. 3, pp. 381–389.
17.
Mohamed AliM.S.OehlersD.J. and GriffithM.C. (2008a). “Simulation of plastic hinges in FRP plated RC beams”, Journal of Composites for Construction, ASCE, Vol. 12, No. 6, pp. 617–625.
18.
Mohamed AliM.S.OehlersD.J. and GriffithM.C. (2008b) “The Residual strength of confined concrete”, Advances in Structural Engineering (Accepted Journal Article)
19.
OehlersD.J. (2006). “Ductility of FRP plated flexural members”, Cement and Concrete Composites, Vol. 28, pp. 898–905.
20.
OehlersD.J.CampbellL.HaskettM.AntramP. and ByrneR., (2006). “Moment redistribution in RC beams retrofitted by longitudinal plating”, Advances in Structural Engineering, Vol. 9, No.2, pp. 257–264.
21.
OehlersD.J.LiuI.S.T. and SeracinoR. (2005). “The gradual formation of hinges throughout reinforced concrete beams”, Mechanics Based Design of Structures and Machines, Vol. 33, pp. 375–400.
22.
OehlersD.J.Mohamed AliM.S.GriffithM.C. and OzbakkalogluT. (2007). “Fundamental issues that govern the rotation of FRP retrofitted RC columns and beams: The intractable plastic hinge ductility problem”, Proceedings of the Inaugural Asia-Pacific Conference on FRP in Structures APFIS 2007, Hong Kong.
23.
OehlersD.J.Mohammed AliM.S. and GriffithM.C. (2008a). “Concrete component of the rotational ductility of reinforced concrete flexural members”, Advances in Structural Engineering, Vol. 11, No. 3, pp. 293–303.
24.
OehlersD.J.HaskettM.WuC. and SeracinoR. (2008b). “Embedding NSM FRP plates for improved IC debonding resistance”, Journal of Composites for Construction, ASCE, Vol. 12, No. 6, pp. 635–642.
25.
PanagiotakosT.B. and FardisM.N. (2001). “Deformations of reinforced concrete members at yielding and ultimate”, ACI Structural Journal, Vol. 98, No. 2, pp. 135–148.
26.
PriestleyM.J.N. and ParkR. (1987). “Strength and ductility of concrete bridge columns under seismic loading”, ACI Structural Journal, Vol. 84, No. S8, pp. 61–76.
27.
SeracinoR.SaifulnazRaizal M.R. and OehlersD.J. (2007) “Generic debonding resistance of EB and NSM plate-to-concrete joints”, Composites for Construction, Vol. 11, No. 1, pp. 62–70.
28.
VecchioF.J. and LaiD. (2004). “Crack shear-slip in reinforced concrete elements”, Journal of Advanced Concrete Technology, Vol. 2, No. 3 pp. 289–300.
29.
WalravenJ.FrenayJ. and PruijssersA. (1987). “Influence of concrete strength and load history on the shear friction capacity of concrete members”, PCI Journal, Vol.32, No.1, pp. 66–84.
30.
WoodR.H. (1968). “Some controversial and curious developments in the plastic theory of structures”, In Engineering Plasticity, HeymanJ.LeckieF.A. Eds; Cambridge University Press: Cambridge, pp. 665–691.
