DEVELOPMENT OF A COMPATIBILITY MODEL FOR TqE SHEAR
STRENGTHENING OF REINFORCED CONCRETE CONTINUOUS BEAMS
USING EXTERNALLY BONDED BI-DIIIECTIONAL CFRP STRIPS
KETUA PENYELIDIK:
PROF. Ir. DR. ABDUL AZIZ BIN DATO' ABDUL SAMAD
AHLI PEWl3LIDIK:
PM DR. J. JAYAPRAKASH
GERAN PEWELIDIKAN FUNDAMENTAL RESEARCH GRANT SCHEME
NO. VOT: 0708
UNIVERSITI TUN HUSSEIN OMV MGLAYSIA
ABSTRACT
The behaviour of reinforced concrete in shear is very complex and structure that fails in
shear was dangerous than flexural failure because shear failure usually occurs suddenly
and without any warning. It has been found out that many of existing reinforced
concrete structures are deficient is shear 'md needs to be repaired. Therefore, this study
tends to investigate the shear behaviour of reinforced concrete beams strengthened and
repaired using Carbon Fibre Reinforced Polymer (CFRP) composites. An experimental
work on ten reinforced concrete continuous beams has been conducted. The parameter
involved in this study was shear span to effective depth ratio, wrapping schemes and
CFRP strips orientation. All beams fails in shear as expected. Modes of failure for
beams wrapped at three sides of the beam were debonding and rupture of the CFRP
strips while beams wrapped at four sides of the beam fails in rupture of the CFRP strips.
The highest shear capacity enhancement was for beam wrapped at four sides of the beam
with 45"/135* orientation of the CFRP strips. From the experimental resuIts, it can be
concluded that wrapping schemes influences the shear capacity and diagonal crack angle
of the beam. It was also important to notice that for continuous beams, due to the
complexity of the high shear and bending moment region, the critical area (inner shear
span) of the high shear area should be strengthened more than the outer shear span of the
beam.
ACI Committee 440 (2006). "Report on Fiber-Reinforced Polymer (FRP) Reinforcement
for Concrete Structures."
ACI Committee 3 18, Building code requirements for struc~alconcrete(ACI 3 18-08),
American Concrete Institute, Detroit, 2008.
ACT Committee 440 (2008). "Guide for the Design and Construction of Externally
Bonded FRP Systems for Strengthening Concrete Structures."
Adhikary, B.B. and Mutsuyoshi, H. (2004) "Behavior of Concrete Beams Strengthened
in Shear with Carbon-Fiber Sheets." Journal of Composites for Construction.
258 - 264
Balaguru, P., Nanni, A. and Giancaspro. J. (2009). "FRP Composites for Reinforced and
Prestress Concrete Structures". Taylor & Francis Group. 270. USA.
Bank, L.C. (2006), Composite for Construction: Structural Design with FRP Materials.
Chajes, M.J., Januszka, T.F., Mertz, D.R., Thornson, T.A.J. and Finch, W.W.J (1995).
"Shear Strengthening of Reinforced Concrete Beams using Externally Applied
Composite Fabrics." ACIStructural Journal. 92.295 - 303
Cusson,R and Xi, Y. (2002). "The Behaviour of Fiber-Reinforced Polymer
Reinforcement in Low Temperature Environmental Climates". Department of
Civil, Environmental and Architectural Engineering, University of Colorado. pp
10-20
EI-Refaie, S.A., Ashour, A.F. and Garrity, S.W. (200 1). "Strengtheing of Reinforced
Concrete Continuous Beams with CFRP Composites." Proceedings of the
International
Conference
on
Structural
Engineering, Mechanics
and
Computation, Cape Town, South AAJiica, Elsevier. 1591 - 1598
El-Sayed, A.K. and Soudki, . K. (2010). "Evaluation of Shear Design Equation of
Concrete Beam with FRP Reidorcement." Journal of Composites for
Construction 15, No. I. 9-20
Grace, N. F., Soliman, A.K. Abdel Sayed, G and Saleh K.R. (1998). "Behaviour and
Ductility of Simply and Continuous FRP Reinforced Beams." Journal of
Compositesfor Construction. 186 - 194
Gravina, R.J. and Smith, S.T. (2008). "FIexuraI Behaviour of Indeterminate Concrete
Beams Reinforced with FRP Bars." Engineering Structures 30. No.9.2370-2380
Hanus, J.P, Bank, L.C. and Oliva, M.G. (2009). "Combined Loading of a Bridge Deck
Reinforced with a Structural FRP Stay-in-Place From". Construction and
Building Materials 23, No.4. 1605-1619.
Jayaprakash.J.(2006).Shear Strengthening of reinforced Concrete
Externally Bonded
BI-Directional
CFRP. Universiti
Beams Using
Putra
Malaysia:
Ph.D.Thesis.
Khalifa, A. and Nanni, A. (2002) "Rehabilitation of Rectangular Simply Supported RC
Beams with Shear Deficiencies using CFRP Composites." Construction and
Building Materials 16. 135-146
Khalifa, A. and Nanni, A. (2000) "Improving Shear Capacity of Existing RC T-Section
Beams using CFRP Composites." Cement and Concrete Composites. 22. 165174
Khalifa, A., Tumialan, G., Nanni, A. and Belarbi, A. (1999) "Shear Strengthening of
Continuous RC Beams using Externaliy Bonded CFRP Sheets." American
Concrete Institute, Proceedings of 4fh International Symposium on FRP for
Reinforcement of Concrete Structures (FRPRCS4), Baltimore. 995 - 1008
KhaIifa, A. Gold, W.J., Nanni,A. and Abdel Aziz, M.1. (1998). "Contribution of
Externally Bonded FRP to Shear Capacity of RC Flexural Members." Journal of
Compositesfor Construction. 195 - 202
Kodur, V.K.R. and Baingo, D. (1999). "Evaluation of Fire Resistancee of FRPreinforced Concrete Slabs." 927-937
Leung, C.K.Y. and Pan, J (2005). "Effect on Concrete Composition on FRPIConcrete
Bond Capacity." Department of Civil Engineering, HKUST. Proceedings of the
International Symposium on Bond Behaviour ofFRP in Structure (BBFS 2005)
Li, G.,Maricherla, D., Singh, K., Pang, S.S. and John, M. (2006). " Effect of Fiber
Orientation on the Structural Behavior of FRP Wrapped Concrete Cylinders."
Composite Structures 74.475-483
MacGregor, J.G. and Bartlet, F.M. (2000). "Reinforced Concrete-Mechanics and
Design." Prentice-Hall, Canada, Ontario.