Behavior of Shear-Critical RC Beams Strengthened with CFRCM
Publication: Journal of Composites for Construction
Volume 22, Issue 1
Abstract
Strengthening of RC structures using fiber-reinforced polymer (FRP) systems is a popular rehabilitation technique because of its ease of installation and reduced construction time compared with other methods. Fabric-reinforced cementitious mortar (FRCM) is a new alternative strengthening system with additional advantages including excellent compatibility with concrete substrate and easier postrepair inspection of repaired structures. This paper presents the results of an experimental study on the behavior of shear-critical RC beams strengthened with carbon FRCM (CFRCM) composite systems. Six large-scale shear-critical RC beams were tested. The test variables included the amount of internal transverse reinforcement and CFRCM strengthening. The test results indicated that CFRCM strengthening is effective in enhancing the load-carrying capacity of shear-critical RC beams. However, the effectiveness of CFRCM strengthening decreased with the presence of stirrups and slightly reduced the shear-strength contribution from internal stirrups. The experimental shear-strength contributions were also compared with theoretical predictions using new guidelines from the American Concrete Institute. Finally, the shear transfer mechanism in the CFRCM layer was discussed.
Get full access to this article
View all available purchase options and get full access to this article.
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 and the donation of the mortar from Sika Canada are 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. Rayed Al-Yousef for his help in laboratory work.
References
ACI (American Concrete Institute). (2008). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440.2R-08, Farmington Hills, MI, 76.
ACI (American Concrete Institute). (2013). “Guide to design and construction of externally bonded fabric-reinforced cementitious matrix systems for repair and strengthening concrete and masonry structures.” ACI-549.4R, Farmington Hills, MI.
ACI (American Concrete Institute). (2014). “Building code requirements for structural concrete and commentary.” ACI 318-14, Farmington Hills, MI, 520.
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.
Arboleda, D., Loreto, G., De Luca, A., and Nanni, A. (2012). “Material characterization of fiber reinforced cementitious matrix (FRCM) composite laminates.” Proc., Int. Symp. on Ferrocement and Thin Reinforced Cement Composites (FERRO 10), International Ferrocement Society, Tavares, FL.
Awani, O., El-Maaddawy, T., and Ismail, N. (2017). “Fabric-reinforced cementitious matrix: A promising strengthening technique for concrete structures.” Constr. Build. Mater., 132(1), 94–111.
Azam, R., and Soudki, K. (2012). “Structural performance of shear-critical RC deep beams with corroded longitudinal steel reinforcement.” Cem. Concr. Compos., 34(8), 946–957.
Azam, R., and Soudki, K. (2013). “Structural behavior of shear-critical RC slender beams with corroded properly anchored longitudinal steel reinforcement.” J. Struct. Eng., 04013011.
Azam, R., and Soudki, K. (2014). “FRCM strengthening of shear-critical RC beams.” J. Compos. Constr., 04014012.
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.
Brückner, A., Ortlepp, R., and Curbach, M. (2006). “Textile reinforced concrete for strengthening in bending and shear.” Mater. Struct., 39(8), 741–748.
Brückner, A., Ortlepp, R., and Curbach, M. (2008). “Anchoring of shear strengthening for T-beams made of textile reinforced concrete (TRC).” Mater. Struct., 39(8), 741–748.
Chaallal, O., Shahawy, M., and Hassan, M. (2002). “Performance of reinforced concrete T-girders strengthened in shear with carbon fiber-reinforced polymer fabric.” ACI Struct. J., 99(3), 335–343.
Chen, G., Teng, J., Chen, J., and Rosenboom, O. (2010). “Interaction between steel stirrups and shear-strengthening FRP strips in RC beams.” J. Compos. Constr., 498–509.
Colalillo, M. A., and Sheikh, S. A. (2014). “Behaviour of shear-critical reinforced concrete beams strengthened with fiber-reinforced polymer—Experimentation.” ACI Struct. J., 111(6), 335–343.
CSA (Canadian Standards Association). (2014). “Design of concrete structures.” CSA A23.3-14, Mississauga, ON, Canada, 297.
Donnini, J., Basalo, F., Corinaldesi, V., Lancioni, G., and Nanni, A. (2017). “Fabric-reinforced cementitious matrix behaviour at high-temperature: Experimental and numerical results.” Compos. Part B, 108(1), 108–121.
Donnini, J., and Corinaldesi, V. (2017). “Mechanical characterization of different FRCM systems for structural reinforcement.” Constr. Build. Mater., 145(1), 565–575.
Donnini, J., Corinaldesi, V., and Nanni, A. (2016). “Mechanical properties of FRCM using carbon fabrics with different coating treatments.” Composites Part B, 88(1), 220–228.
Escrig, C., Gil, L., Bernat-Maso, E., and Puigvert, F. (2015). “Experimental and analytical study of reinforced concrete beams shear strengthened with different types of textile-reinforced mortar.” Constr. Build. Mater., 248–260.
Malek, A. M., and Saadatmanesh, H. (1998). “Analytical study of reinforced concrete beams strengthened with web-bonded fiber reinforced plastic plates or fabrics.” ACI Struct. J., 95(3), 343–352.
Mofidi, A., and Chaallal, O. (2014). “Effect of steel stirrups on shear resistance gain due to externally bonded fiber-reinforced polymer strips and sheets.” ACI Struct. J., 111(1), 1–9.
Pellegrino, C., and Modena, C. (2002). “Fiber reinforced polymer shear strengthening of RC beams with transverse steel reinforcement.” J. Compos. Constr., 104–111.
Tetta, Z., Koutas, L., and Bournas, D. (2015). “Textile-reinforced mortar (TRM) versus fiber-reinforced polymers (FRP) in shear strengthening of concrete beams.” Compos. Part B: Eng., 77(1), 338–348.
Triantafillou, T. C., and Papanicolaou, C. G. (2007). “Shear strengthening of reinforced concrete members with textile reinforced mortar (TRM) jackets.” Mater. Struct., 39(1), 93–103.
Tzoura, E., and Triantafillou, T. C. (2016). “Shear strengthening of reinforced concrete T-beams under cyclic loading with TRM or FRP jackets.” Mater. Struct., 49(1–2), 17–28.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 22 • Issue 1 • February 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Feb 17, 2017
Accepted: Sep 11, 2017
Published online: Nov 24, 2017
Published in print: Feb 1, 2018
Discussion open until: Apr 24, 2018
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.