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http://dx.doi.org/10.12989/sem.2005.20.6.727

Strength and ductility of biaxially loaded high strength RC short square columns wrapped with GFRP jackets  

Hodhod, O.A. (Structural Engineering Department, Cairo University)
Hassan, W. (Department of Strength of Materials and Quality Control, HBRC)
Hilal, M.S. (Structural Engineering Department, Cairo University)
Bahnasawy, H. (Department of Strength of Materials and Quality Control, HBRC)
Publication Information
Structural Engineering and Mechanics / v.20, no.6, 2005 , pp. 727-745 More about this Journal
Abstract
The present study is an experimental investigation into the behaviour of high strength concrete square short columns subjected to biaxial bending moments and strengthened by GFRP laminates. The main objectives of the study are: to evaluate the improvement in the structural performance of HSC short square columns subjected to small biaxial eccentricity when strengthened by externally applied FRP laminates, and to investigate the optimum arrangement and amount of FRP laminates to achieve potential enhancement in structural performance especially ductility. The parameters considered in this study are: number of FRP layers and arrangement of wraps. The load eccentricity is kept corresponding to e/t = 0.125 in two perpendicular directions to the columns principal axes, and the wraps are applied in single or double layers (partial or full wrapping). In the present work, test results of five full scale concrete columns are presented and discussed. The study has shown that FRP wraps can be used successfully to enhance the ductility of HSC columns subjected to biaxial bending by 300%.
Keywords
RC columns; biaxial bending; strengthening; rehabilitation; advanced composite materials; fiber reinforced plastics (FRP);
Citations & Related Records

Times Cited By Web Of Science : 2  (Related Records In Web of Science)
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1 Bencardino, E, Colotti, V., Spadea, G and Totaro, N. (2002), 'Axial load-flexural moment interaction in RC columns with bonded FRP laminates', Proc. of the Third Middle East Symposium on Structural Composites for Infrastructures Applications, Aswan, Egypt, Dec. 17-20
2 Bresler, B. (1960), 'Design criteria for reinforced columns under axial load and biaxial bending', ACI Struct. J., 57(5), November 1960, 481-490
3 Chaallal, O. and Shahawy, M. (2000), 'Performance of fiber-reinforced polymer wrapped reinforced concrete column under combined axial-flexural loading', ACI Struct. J., 97(4), July-August 2000, 659-668
4 Demers, M. and Neale, K.W. (1994), 'Strengthening of concrete columns with unidirectional composite sheets', Development in Short and Medium Span Bridge Engineering'94, 895-905
5 El-Afandy, T.H. (2002), 'Strengthening of reinforced concrete columns using advanced laminates', M.Sc. Thesis, Faculty of Engineering, Ain Shams University, Egypt
6 El-Afandy, T.H., Hosny, A., Shaheen, H. and Abdel Rahamn, A. (2002), 'Uniaxial tests on rectangular columns strengthened with CFRP', Proc. of the Third Middle East Symposium on Structural Composites for Infrastructures Applications, Aswan, Egypt, Dec. 17-20
7 El-Mihilmy, M.T. (1992), 'Behavior and design of biaxially loaded columns', M.Sc. Thesis, Faculty of Engineering, Cairo University, Egypt
8 Fam, A.Z. and Rizkalla, S.H. (2001), 'Confinement model for axially loaded concrete confined by circular fiber reinforced polymer tubes', ACI Struct. J., 89(4), My-August 2001, 451-461
9 Gurfinkel, G (1985), 'Analytical approach to biaxial eccentricity', J. Struct. Eng., ASCE, 86(ST4), August 1985, 105-159
10 Hosotani, M., Kawashima, K. and Hoshikuma, J. (1997), 'A study on confinement of concrete cylinders by carbon fiber sheets', Proc. of the Third Int. Symposium of Non-Metallic (FRP) Reinforcement for Concrete Structures, Japan, October 1997, 209-216
11 Hsu, C.T.T., Hsu, L.S.M. and Tsao, W.H. (1995), 'Biaxially loaded slender high-strength concrete columns with and without steel fibres', Magazine of Concrete Research, 47(173), December 1995, 299-310   DOI
12 Ismail, K. and Ghoneim, M. (2002), 'Strength of eccentrically loaded reinforced concrete rectangular columns wrapped with FRP jackets', Proc. of the Third Middle East Symposium on Structural Composites for Infrastructures Applications, Aswan, Egypt, Dec. 17-20
13 Mahfouz, I., Rizk, T. and Sarkani, S. (2001), 'Utilization of advanced composites in the construction industry in Egypt', Proc. of the Int. Workshop on Structural Composites for Infrastructure Applications, Cairo, Egypt, May 2001, 19-27
14 Matthys, S., Tearwe, L. and Audenaert, K. (1999), 'Tests on axially loaded concrete columns confined by fiber reinforced polymer sheet wrap', The Fourth Int. Symposium on Fiber Reinforced Polymer Reinforcement for Concrete Structures, USA, 217-228
15 Miramiran, A. and Shahawy, M. (1997), 'Behavior of concrete columns confined by fiber composites', J. Struct. Eng, ASCE, 123(5), May 1997, 583-590   DOI   ScienceOn
16 Miyauchi, K., Nishibayashi, S. and Inoue, S. (1997), 'Estimation of strengthening effects with carbon fiber sheet for concrete column', Proc. of the Third Int. Symposium of Non-Metallic (FRP) Reinforcement for Concrete Structures, Japan, October 1997, 217-224
17 Neale, K. and Labossiere, P. (1997), 'State-of-the-art report on retrofitting and strengthening by continuous fiber in Canada', Proc. of the Third Int. Symposium of Non-Metallic (FRP) Reinforcement for Concrete Structures, Japan, October 1997, 25-39
18 Rochette, P. and Labossiere, P. (2000), 'Axial testing of rectangular column models confined with composites', J. of Composites for Construction, ASCE, 4(3), August 2000, 129-136   DOI   ScienceOn
19 Suter, R. and Pinzelli. (2001), 'Confinement of concrete columns with FRP sheets', Proc. of The Fifth Int. Symposium on Non-Metallic (FRP) Reinforcement for Concrete Structures, University of Cambridge, United Kingdom, 793-802
20 Torkey, A.M. and Shaaban, I.G (2001), 'Ductility of biaxially loaded high strength reinforced concrete columns', Journal of Engineering and Applied Science, Faculty of Engineering, Cairo University, 48(4), August 2001, 655-674
21 Wang, Y.C. and Restrepo, J.I. (2001), 'Investigation of concentrically loaded reinforced concrete columns confined with glass fiber-reinorced polymer jackets', ACI Struct. J., 98(3), May-June 2001, 377-385
22 Watanabe, K., Nakamura, H., Honda, Y., Toyoshima, M., Iso, M., Fujimaki, T., Kaneto, M. and Shirai, N. (1997), 'Confinement effect of FRP sheet on strength and ductility of concrete cylinders under uniaxial compression', Proc. of the Third Int. Symposium of Non-Metallic (FRP) Reinforcement for Concrete Structures, Japan, October 1997, 217-224
23 ECFRP, Third Draft, (2004), 'The Egyptian code for design bases and execution conditions of fiber reinforced polymers in construction fields', Housing and Building Research Center, Egypt
24 Samaan, M., Mirmiran, A. and Shahawy, M. (1998), 'Model of concrete confined by fiber composites', J. Struct. Eng., ASCE, 124(9), September 1998, 1025-1031   DOI   ScienceOn