Evaluation of Effective Polymer Fiber Length on Energy Absorption Capacity of Reinforced Beams by EBR and NSM Methods
Keywords:Retrofitting, Externally Bonded Reinforcement (EBR) method, Near-urface Mounting (NSM) Method, Finite Element Method, RC beam
This study presents a comparison of two methods used for retrofitting Reinforced Concrete (RC) beams, namely, the Externally Bonded Reinforcement (EBR) and the Near-Surface Mounting (NSM) methods. A parametric analysis was carried out using variables such as the retrofitted, the retrofitting method (EBR and NSM), and the thickness of the Carbon Fiber-Reinforced Polymer (CFRP) sheets. To achieve this goal, the finite element method and ABAQUS software were employed. An un-retrofitted beam was also simulated as the control specimen for comparison. Beam responses were compared through load–displacement and energy absorption capacity diagrams. Results show that the higher energy absorption capacity in all CFRP-retrofitted RC beams, which was 1.69–5.54 times higher than in un-retrofitted beams. In the case where half of the beam was reinforced using CFRP sheets, the entire beam assembly and the CFRP sheet contributed to load-bearing, thus delaying crack nucleation in the beam and increasing its energy absorption capacity. As a result, the energy absorption capacity of the beam, in this case, was less than that obtained in the previous one where half the span of the beam was retrofitted.
American Concrete Institute. ACI Committee 440 .(2008) “Guide for the design and construction of externally bonded FRP system for strengthening concrete structures”. Farmington Hills, MI: ACI 440.2R-08.
Galecki, G. and Myers, J., (2001)," Limitation to use of waterjets in concrete substrate preparation", American Waterjet Conference, No. 53, Minneapolis, USA.
Babaei, m; Laki, A.,(2014), Comparison of New Methods of Reinforcing Concrete Beams, 6th National Congress of Civil Engineering, Semnan, Iran (persian).
De Lorenzis L.a, J.G. Teng, (2007). "Near-surface mounted FRP reinforcement: An emerging technique for strengthening structures. Composites Part B: Engineering, 38(2), pp.119-143.
Afzir Retrofit Cataloge.,(2013(, https://www.afzir.com/catalogues.
Abduljalil, B.S., (2014), Shear resistance of reinforced concrete deep beams with opening strengthened by CFRP strips. Journal of Engineering and Development, 18(1), pp.14-32.
Kharatmol, R., Sananse, P., Tambe, R. and Khare, R.J., (2014). Strengthening of Beams Using Carbon Fibre Reinforced Polymer. International Journal of Emerging Engineering Research and Technology, 2(3), pp.119-125.
Mofidi, A., Chaallal, O., Cheng, L. and Shao, Y., (2016). Investigation of near surface–mounted method for shear rehabilitation of reinforced concrete beams using fiber reinforced–polymer composites. Journal of Composites for Construction, 20(2), p.04015048.
Tahsiri, H., Sedehi, O., Khaloo, A. and Raisi, E.M., (2015). Experimental study of RC jacketed and CFRP strengthened RC beams. Construction and Building Materials, 95, pp.476-485.
Khalifa, A.M., (2016). Flexural performance of RC beams strengthened with near surface mounted CFRP strips. Alexandria Engineering Journal, 55(2), pp.1497-1505.
Ceroni, F., (2010). Experimental performances of RC beams strengthened with FRP materials. Construction and Building materials, 24(9), pp.1547-1559.
Chen, W., Pham, T.M., Sichembe, H., Chen, L. and Hao, H., (2018). Experimental study of flexural behaviour of RC beams strengthened by longitudinal and U-shaped basalt FRP sheet. Composites Part B: Engineering, 134, pp.114-126.
Carlos, T.B., Rodrigues, J.P.C., de Lima, R.C. and Dhima, D., (2018). Experimental analysis on flexural behaviour of RC beams strengthened with CFRP laminates and under fire conditions. Composite Structures, 189, pp.516-528.
Hawileh, R.A., Abdalla, J.A. and Naser, M.Z., (2019). Modeling the shear strength of concrete beams reinforced with CFRP bars under unsymmetrical loading. Mechanics of Advanced Materials and Structures, 26(15), pp.1290-1297.
Reddy, H.J., (2018). A Comparative Study on the Experimental Results of Strengthened Beams using Externally Bonded Laminate Technique with Strengthening Codes. International Journal of Applied Engineering Research, 13(5), pp.2119-2124.
Bilotta, A., Ceroni, F., Nigro, E. and Pecce, M., (2015). Efficiency of CFRP NSM strips and EBR plates for flexural strengthening of RC beams and loading pattern influence. Composite Structures, 124, pp.163-175.
ABAQUS theory manual. (2016), Pawtucket, R.I: Hibbitt, Karlsson and Sorensen.
Kotynia, R. and Cholostiakow, S., (2015). New proposal for flexural strengthening of reinforced concrete beams using CFRP T-shaped profiles. Polymers, 7(11), pp.2461-2477.
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