RETROFITTING SFRC BEAMS BY USING CFRP

Yıl 2017, Sayı: 1, 310 - 315, 09.11.2017

Riza Secer Orkun Keskin Kadir Sengun Guray Arslan

Öz

The use of structural members made of steel fiber reinforced concrete (SFRC) has
been increasing since it has been shown through numerous researches that steel
fibers promotes the mechanical properties of concrete beyond cracking and
improve the crack control characteristics of concrete significantly. A
particular use of steel fibers aims to enhance the behavior of reinforced
concrete (RC) beams without web reinforcement. Even thouh there have been
numerous researches focused on the contribution of steel fibers to the behavior
of  reinforced concrete (RC) beams
without web reinforcement, the studies on retrofitting of SFRC beams is very
limited. An advantegous retrofitting method is to use carbon fiber reinforced polymers (CFRP) due to the fact that
it has relatively high tensile strength and low weight, and it can be applied
easily and rapidly. In this study, RC beams with a shear span-to-effective
depth ratio of 4.5 were loaded up to their load-carrying capacities and then
tested again after retrofitting with CFRP. The experimental results were
examined in the context of strength, stiffness and ductility.

Anahtar Kelimeler

Reinforced concrete, beam, steel fiber, carbon fiber reinforced polymer

Kaynakça

• Ahmed, E., Legeron, F., & Ouahla, M. (2015). Steel fiber as replacement of minimum shear reinforcement for one-way thick bridge slab. Construction and Building Materials, 78, 303-314. doi:10.1016/j.conbuildmat.2014.12.095. Alzate, A., Arteaga, A., de Diego, A., & Perera, R. (2009). Shear strengthening of reinforced concrete beams using fibre reinforced polymers (FRP). European Journal of Environmental and Civil Engineering, 13(9), 1051-1060. doi:10.1080/19648189.2009.9693172. Aoude, H., Belghiti, M., Cook, W., & Mitchell, D. (2012). Response of steel fiber-reinforced concrete beams with and without stirrups. ACI Structural Journal, 109(3), 359–368. doi:10.14359/51683749. Biolzi, L., & Cattaneo, S. (2017). Response of steel fiber reinforced high strength concrete beams: experiments and code predictions. Cement and Concrete Composites, 77, 1–13. doi:10.1016/j.cemconcomp.2016.12.002. Bukhari, I.A., Vollum, R.L., & Ahmad, S., & Sagaseta, J. (2010). Shear strengthening of reinforced concrete beams with CFRP. Magazine of Concrete Research, 62(1), 65-77. doi:10.1680/macr.2008.62.1.65. Dinh, H.H., Parra-Montesinos, G.J., & Wight, J.K. (2010). Shear behavior of steel fiber-reinforced concrete beams without stirrup reinforcement. ACI Structural Journal, 107(5), 597-606. doi:10.14359/51663913. Jain, K., & Singh, B. (2014). Investigation of steel fibres as minimum shear reinforcement. Structures and Buildings, 167(5), 285-299. doi:10.1680/stbu.12.00071. Kadir, M.R.A., & Saeed, J.A. (1986). Shear strength of fiber reinforced concrete beams. Journal of Engineering and Technology, 4(3), 98-112. Keskin, R.S.O., Arslan, G., & Sengun, K. (2017). Influence of CFRP on the shear strength of RC and SFRC beams. Construction and Building Materials, 153, 16-24. doi:10.1016/j.conbuildmat.2017.06.170 Khalifa, A., & Nanni, A. (2000). Improving shear capacity of existing RC T-section beams using CFRP composites. Cement and Concrete Composites, 22(2), 165-174. doi:10.1016/S0958-9465(99)00051-7. Kwak, Y.K., Eberhard, M.O., Kim, W.S., & Kim, J. (2002). Shear strength of steel fiber-reinforced concrete beams without stirrups. ACI Structural Journal, 99(4), 530-538. doi:10.14359/12122. Li, V.C., Ward, R., & Hamza, A.M. (1992). Steel and synthetic fibers as shear reinforcement. ACI Materials Journal, 89(5), 499-508. doi:10.14359/1822. Lim, T.Y., Paramasivam, P., & Lee, S.L. (1987). Shear and moment capacity of reinforced steel-fiber-concrete beams. Magazine of Concrete Research, 39(140), 148-160. doi:10.1680/macr.1987.39.140.148. Mansur, M.A., Ong, K.C.G., & Paramasivam, P. (1986). Shear strength of fibrous concrete beams without stirrups. ASCE Journal of Structural Engineering, 112(9), 2066-2079. doi:10.1061/(ASCE)0733-9445(1986) 112:9(2066). Minelli, F., & Plizzari, G.A. (2013). On the effectiveness of steel fibers as shear reinforcement. ACI Structural Journal, 110(3), 379-390. doi:10.14359/51685596. Minelli, F., Conforti, A., Cuenca, E., & Plizzari, G. (2014). Are steel fibres able to mitigate or eliminate size effect in shear? Materials and Structures, 47(3), 459–473, doi:10.1617/s11527-013-0072-y. Narayanan, R., & Darwish, I.Y.S. (1987). Use of steel fibers as shear reinforcement. ACI Structural Journal, 84(3), 216-227. doi:10.14359/2654. Sahoo, D., & Sharma, A. (2014). Effect of steel fiber content on behavior on concrete beams with and without shear stirrups. ACI Structural Journal, 111(5), 1157–1166. doi:10.14359/51686821. Sahoo, D., Maran, K., & Kumar, A. (2015). Effect of steel and synthetic fibers on shear strength of RC beams without shear stirrups. Construction and Building Materials, 83, 150–158. doi:10.1016/j.conbuildmat.2015.03.010. Sahoo, D., Bhagat, S., & Reddy, T. (2016). Experimental study on shear-span to effective depth ratio of steel fiber reinforced concrete T-beams. Materials and Structures, 49(9), 3815–3830. doi:10.1617/s11527-015-0756-6. Shoaib, A., Lubell, A.S., & Bindiganavile, V.S. (2014). Size effect in shear for steel fiber-reinforced concrete members without stirrups. ACI Structural Journal, 111(5), 1081-1090. doi:10.14359/51686813. Susetyo, J., Gauvreau, P., & Vecchio, F.J. (2011). Effectiveness of steel fiber as minimum shear reinforcement. ACI Structural Journal, 108(4), 488-496. doi:10.14359/51682990 Swamy, R.N., & Bahia, H.M. (1985). The effectiveness of steel fibers as shear reinforcement. Concrete International, 7(3), 35-40. Triantafillou, T.C. (1998). Shear strengthening of reinforced concrete beams using epoxy-bonded FRP composites. ACI Structural Journal, 95(2), 107-115. doi:10.14359/531. Yazici, S., Inan, G., & Tabak, V. (2007). Effect of aspect ratio and volume fraction of steel fiber on the mechanical properties of SFRC. Construction and Building Materials, 21(6), 1250–1253. doi:10.1016/j.conbuildmat.2006.05.025.