FRCM Strengthening of Shear-Critical RC Beams
Publication: Journal of Composites for Construction
Volume 18, Issue 5
Abstract
This paper presents the results of an experimental study conducted to investigate the effectiveness of different types of fabric-reinforced cementitious matrix (FRCM) composite systems to strengthen shear critical reinforced concrete (RC) beams. Seven shear-critical RC beams were tested. The test variables included the strengthening material (glass FRCM or carbon FRCM) and the strengthening scheme (side bonded or u-wrapped). The test results revealed that FRCM strengthening is effective in enhancing the load-carrying capacity of shear-critical RC beams. The increase in load-carrying capacity of the FRCM-strengthened beams ranged between 19 and 105%. Both strengthening schemes (side bonded and u-wrapped) exhibited similar behavior, suggesting that the excellent bond of the FRCM to concrete may not require u-wrapped applications for anchorage. The experimental results were also compared with theoretical predictions according to fiber-reinforced polymer (FRP) design guidelines in North America with some modifications. The American Concrete Institute (ACI) predictions were in good correlation with experimental results, whereas the Canadian Standards Association (CSA) predictions were slightly unconservative.
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Acknowledgments
The authors would like to acknowledge the financial support received from the Natural Sciences and Engineering Research Council (NSERC). The donation of the concrete from Hogg Ready Mix is appreciated. The help in laboratory work provided by the University of Waterloo technicians and the other members of the rehabilitation research group at the University of Waterloo is greatly appreciated. Special thanks go to Mr. Hesham Elhuni for his help in laboratory work.
References
Al-Salloum, Y. A., Elsanadedy, H. M., Alsayed, S. H., and Iqbal, R. A. (2012). “Experimental and numerical study for the shear strengthening of reinforced concrete beams using textile-reinforced mortar.” J. Compos. Constr., 74–90.
American Concrete Institute (ACI). (2008a). “Building code requirements for structural concrete.”, Farmington Hills, MI.
American Concrete Institute (ACI). (2008b). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.”, Farmington Hills, MI.
Arboleda, D., Loreto, G., De Luca, A., and Nanni, A. (2012). “Material characterization of fiber reinforced cementitious matrix (FRCM) composite laminates.” X Int. Symp. on Ferrocement and Thin Reinforced Cement Composites (FERRO 10), Havana, Cuba, International Ferrocement Society.
Basalo, F., Matta, F., and Nanni, A. (2012). “Fiber reinforced cement-based composite system for concrete confinement.” Constr. Build. Mater., 32(1), 55–65.
Belarbi, A., Bae, S.-W., Ayoub, A., Kuchma, D., Mirmiran, A., and Okeil, A. (2011). “Design of FRP systems for strengthening concrete girders in shear.”, National Cooperative Highway Research Program, Washington, DC, 130.
Blanksvard, T., Taljsten, B., and Carolin, A. (2009). “Shear strengthening of concrete structures with the use of mineral-based composites.” J. Compos. Constr., 25–34.
Bournas, D. A., Lontou, P. V., Papanicolaou, C. G., and Triantafillou, T. C. (2007). “Textile-reinforced mortar (TRM) versus FRP confinement in reinforced concrete columns.” ACI Struct. J., 104(6), 740–748.
Bournas, D. A., and Triantafillou, T. C. (2011a). “Bar buckling in RC columns confined with composite materials.” J. Compos. Constr., 393–403.
Bournas, D. A., and Triantafillou, T. C. (2011b). “Bond strength of lap spliced bars in concrete confined with composite materials.” J. Compos. Constr., 156–167.
Bournas, D. A., Triantafillou, T. C., Zygouris, K., and Stavropoulos, F. (2009). “Textile-reinforced mortar versus FRP jacketing in seismic retrofitting of RC columns with continuous or lap-spliced deformed bars.” J. Compos. Constr., 360–371.
Brückner, A., Ortlepp, R., and Curbach, M. (2008). “Anchoring of shear strengthening for T-beams made of textile reinforced concrete (TRC).” Mater. Struct., 41(2), 407–418.
Brückner, A., Ortlepp, R., and Curbach, M. (2006). “Textile reinforced concrete for strengthening in bending and shear.” Mater. Struct., 39(8), 741–748.
Canadian Standard Association (CAN/CSA). (2004). “Design of concrete structures.” CAN/CSA-A23.3-04, Rexdale, ON, Canada, 240.
Canadian Standard Association (CAN/CSA). (2006). “Canadian highway bridge design code.” CAN/CSA-S6-06, Toronto.
Collins, M. P., Bentz, E. C., and Sherwood, E. G. (2008). “Where is shear reinforcement required? A review of research results and design procedures.” ACI Struct. J., 105(5), 590–600.
Hashemi, S., and Al-Mahaidi, R. (2012). “Experimental and finite element analysis of flexural behavior of FRP-strengthened RC beams using cement-based adhesives.” Constr. Build. Mater., 26(1), 268–273.
Higgins, C., and Farrow, W. C. (2006). “Tests of reinforced concrete beams with corrosion-damaged stirrups.” ACI Struct. J., 103(1), 133–141.
Jumaat, M. Z., Rahman, M. A., Alam, M. A., and Rahman, M. M. (2011). “Premature failures in plate bonded strengthened RC beams with an emphasis on premature shear: A review.” Int. J. Phys. Sci., 6(2), 156–168.
Koutas, L., Pitytzogia, A., Triantafillou, T. C., and Bousias, S. N. (2013). “Strengthening of infilled reinforced concrete frames with textile-reinforced mortar (TRM): A study on the development and testing of textile-based anchors.” J. Compos. Constr., A4013015.
Ombres, L. (2011). “Structural performance of PBO FRCM-strengthened RC beams.” Proc. Inst. Civ. Eng. Struct. Build., 164(4), 265–272.
Sherwood, E. G., Lubell, A. S., Bentz, E. C., and Collins, M. P. (2006). “One way shear strength of thick slabs and wide beams.” ACI Struct. J., 103(6), 180–190.
Sneed, L. H., and Ramirez, J. A. (2008). “Effect of depth on the shear strength of concrete beams without shear reinforcement: Experimental study.” SN2921, Portland Cement Association, Skokie, IL, 182.
Suffern, C., El-Sayed, A., and Soudki, K. A. (2010). “Shear strength of distributed regions with corroded stirrups in reinforced concrete beams.” Can. J. Civ. Eng., 37(8), 1045–1056.
Triantafillou, T., and Papanicolaou, C. (2013). “Innovative applications of textile-based composites in strengthening and seismic retrofitting as well as in the prefabrication of new structures.” Adv. Mater. Res., 639–640(1), 26–41.
Triantafillou, T. C., and Papanicolaou, C. G. (2006). “Shear strengthening of reinforced concrete members with textile reinforced mortar (TRM) jackets.” Mater. Struct., 39(1), 93–103.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 18 • Issue 5 • October 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 5, 2013
Accepted: Dec 11, 2013
Published online: Feb 26, 2014
Discussion open until: Jul 26, 2014
Published in print: Oct 1, 2014
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