Repair of reinforced concrete beams in shear using composite materials PRFG subjected to cyclic loading
Abstract
Nowadays, finding new approaches to attenuate the effects of the catastrophic shear failure mode for reinforced concrete beams is a major challenge. Generally the bending failure is ductile. It allows a redistribution of the stresses providing an early warning, whereas the rupture by shear is fragile and sudden which can lead to detrimental consequences for the structures. This research focuses on the repair of deep beams in reinforced concrete shear subjected to 4-point bending. After being preloaded at different levels of their ultimate loads, the beams are repaired by bonding a composite material made of an epoxy resin reinforced by glass fibers. The main objective of this study is to contribute to the mastery of a new method developed by the authors that consists by banding the cracks in critical zones in order to avoid fragile ruptures due to the shear force. This new technique led to better results in terms of mechanical properties when compared to conventional methods, notably the absence of the debonding of the composite found in the case of the repairs of the beams by bands or U-shaped composites. The feasibility, the performances and the behavior of the beams have been examined. The experimental approach adopted using this new technique has shown the influence of the type of loading on the fatigue behavior. In addition, the repair performed led to a considerable improvement in the fatigue durability of the preloaded beam.
References
Arduini, M., Nanni, A. (1997). Behavior of precracked RC beams strengthened with carbon, FRP sheets. ASCE Journal of Composites for Construction, 63-70.
Barnes, R. A., Mays G. C. (1999), Fatigue performance of concrete beams strengthened with CFRP plates, ASCE, Journal of composites for construction, 63 – 72.
Boumaaza, M., Bezazi, A., Bouchelaghem, H., Benzennache, N., Amziane, S. and Scarpa. F. (2017). Behavior of pre-cracked deep beams with composite materials repairs, Techno Press, Structural Engineering and Mechanics 61(4), 575–583.
Boussaha, F. (2008). Comportement en fatigue des poutres en béton armé renforcées en cisaillement à l’aide de matériaux composites avancés. Thèse PhD, École de technologie supérieure, Montréal, Canada., 144.
Choi Y. W., Lee H. K., Chu S. B., Cheong S. H, and Jung, W. Y. (2012). Shear Behavior and Performance of Deep Beams Made with Self-Compacting Concrete. International Journal of Concrete Structures and Materials, 6 (2), 65–78.
De Lorenzis, L., Teng, J. G. (2007). Near-surface mounted FRP reinforcement: An emerging technique for strengthening structures. Composites: Part B, 38, 119–143.
Dong, J., Wang, Q., Guan, Z. (2013). Structural behavior of RC beams with external flexural and flexural–shear strengthening by FRP sheets, Composites: Part B, 44, 604–612.
Kreit, A., Mahmoud, F., Castel, A., François, A. (2011). Repairing corroded RC beam with near-surface mounted CFRP rods. Materials and Structures 44, 1205–1217.
Masoud S., Soudki k., Topper T. (2001), CFRP-strengthened and corroded RC beams under monotonic and fatigue loads, ASCE Journal of composites for construction, pp.228 – 236.
Meier, U., Deuring, M., Meier, H., and Schwegler, G. (1992). Strengthening of structures with CFRP laminates: Research and applications in Switzerland. Advanced Compos. Mat. in Bridges and Struct., K. W. Neale and P. Labossiere, eds. Canadian Society for Civil Engineers, Montreal.
Papakonstantinou, C. G. (2000). Fatigue performance of reinforced concrete beams strengthened with glass fiber reinforced polymer composite sheets.’’ MS thesis, University of South Carolina, Columbia, S.C.
Shahawy M., Beitelman T.E. (1999). Fatigue performance of RC beams strengthened with CFRP Laminates, proceedings of 1st CDDC international conference on durability of fiber reinforced polymer composite for construction, Sherbrook, August, 169-178.
Teo, W., Hing, K.L.M., and Liew, M.S. (2017). Interaction between Internal Shear Reinforcement and External FRP Systems of RC Beams: Experimental Study. The Open Civil Engineering Journal, 11, 143-152.
Wu, Z.Y. (2004). Etude expérimentale du comportement des Poutres courtes en béton armé pré-fissurées et Renforcées par matériaux composite sous Chargement statique et de fatigue. Thèse LCPC Paris, novembre.
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