A Parametric Study on the Flexural Strengthening of Reinforced Concrete Beams with Near Surface Mounted FRP Bars
Abstract
FRP rods as lightweight materials with extraordinary properties of high strength to weight ratio, corrosion resistance, potentially high overall durability, tailor ability and high specific attributes are one of the most favorable materials to strengthen existing reinforced structures. The present study aimed to identify the behavior of reinforced concrete flexural beams strengthened with fiber reinforced polymer (FRP) rods through near surface mounted method (NSM). The results of the current study were based on nonlinear finite element software ABAQUS which can accurately simulate the experimental investigations on flexural behavior of reinforced concrete beams strengthened with NSM FRP rods. Validation of the proposed model was confirmed first by making a comparison with the experimental study presented in the literature. A parametric analysis was conducted on validated specimens to investigate the effect of FRP rod diameters, rod arrangements, FRP materials, as well as rods groove intervals on flexural behavior of strengthened reinforced beams. The numerical results of mid-span bending moment deflection, ultimate bending moment, failure deflection and ductility index were reported. For the sake of simplicity to be used by engineers, the results of the current study were drawn in the form of design charts and tables.
Keywords
References
Sharif, A., Al-Sulaimani, G., Basunbul, I., Baluch, M., and Ghaleb, B., “Strengthening of initially loaded reinforced concrete beams using FRP plates”, ACI Structural Journal, 91 (2), 160-168, 1994. https://doi.org/10.14359/4594.
Grace, N.F., Sayed, G., Soliman, A., and Saleh, K., “Strengthening reinforced concrete beams using fiber reinforced polymer (FRP) laminates”, ACI Structural Journal-American Concrete Institute, 96(5), 865-874, 1999. https://doi.org/10.14359/741.
Nordin, H., and Täljsten, B., “Concrete beams strengthened with prestressed near surface mounted CFRP”, Journal of Composites for Construction, 10(1), 60-68, 2006. https://doi.org/10.1061/(asce)1090-0268(2006)10:1(60).
Bakis, C.E., Ganjehlou, A., Kachlakev, D.I., Schupack, M., Balaguru, P., Gee, D.J., Karbhari, V.M., Scott, D.W., Ballinger, C.A., and Gentry, T.R., “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures”, Reported by ACI Committee, 440, 2002.
Hollaway, L.C., and Teng, J.-G., Strengthening and rehabilitation of civil infrastructures using fibre-reinforced polymer (FRP) composites, Elsevier, 2008.
Bilotta, A., Ceroni, F., Barros, J.A., Costa, I., Palmieri, A., Szabó, Z.K., Nigro, E., Matthys, S., Balazs, G.L., and Pecce, M., “Bond of NSM FRP-strengthened concrete: Round robin test initiative”, Journal of Composites for Construction, 20, 2015. https://doi.org/10.1061/(asce)cc.1943-5614.0000579.
Bilotta, A., Ceroni, F., Nigro, E., and Pecce, M., “Efficiency of CFRP NSM strips and EBR plates for flexural strengthening of RC beams and loading pattern influence”, Composite Structures, 124, 163-175, 2015. https://doi.org/10.1016/j.compstruct.2014.12.046
De Lorenzis, L., and Teng, J., “Near-surface mounted FRP reinforcement: An emerging technique for strengthening structures”, Composites Part B: Engineering, 38, 119-143, 2007. https://doi.org/10.1016/j.compositesb.2006.08.003
Bilotta, A., Ceroni, F., Di Ludovico, M., Nigro, E., Pecce, M., and Manfredi, G., “Bond efficiency of EBR and NSM FRP systems for strengthening concrete members”, Journal of Composites for Construction, 15, 757-772, 2011. https://doi.org/10.1061/(asce)cc.1943-5614.0000204.
Burke, P., “Low and High Temperature Performance of Near Surface Mounted FRP Strengthened Concrete Slabs,” Department of Civil Engineering, Queen’s University, 2008.
Sharaky, I.A., Torres, L., Comas, J., and Barris, C., “Flexural response of reinforced concrete (RC) beams strengthened with near surface mounted (NSM) fibre reinforced polymer (FRP) bars”, Composite Structures, 109, 8-22, 2014. https://doi.org/10.1016/j.compstruct.2013.10.051.
Nguyen, D.M., Chan, T.K., and Cheong, H.K., “Brittle failure and bond development length of CFRP-concrete beams”, Journal of Composites for Construction, 5, 12-17, 2001. https://doi.org/10.1061/(asce)1090-0268(2001)5:1(12).
Novidis, D., Pantazopoulou, S., and Tentolouris, E., “Experimental study of bond of NSM-FRP reinforcement”, Construction and Building Materials, 21, 1760-1770, 2007. https://doi.org/10.1016/j.conbuildmat.2006.05.054.
Al-Mahmoud, F., Castel, A., François, R., and Tourneur, C., “Strengthening of RC members with near-surface mounted CFRP rods”, Composite Structures, 91, 138-147, 2009. https://doi.org/10.1016/j.compstruct.2009.04.040.
Barros, J.A., and Fortes, A., “Flexural strengthening of concrete beams with CFRP laminates bonded into slits”, Cement and Concrete Composites, 27, 471-480, 2005. https://doi.org/10.1016/j.cemconcomp.2004.07.004.
Lee, D., Cheng, L., and Yan-Gee Hui, J., “Bond characteristics of various NSM FRP reinforcements in concrete”, Journal of Composites for Construction, 17, 117-129, 2012. https://doi.org/10.1061/(asce)cc.1943-5614.0000318.
Lu, W., Ling, Z., Geng, Q., Liu, W., Yang, H., and Yue, K., “Study on flexural behaviour of glulam beams reinforced by Near Surface Mounted (NSM) CFRP laminates”, Construction and Building Materials, 91, 23-31, 2015. https://doi.org/10.1016/j.conbuildmat.2015.04.050.
Rizzo, A., and De Lorenzis, L., “Behavior and capacity of RC beams strengthened in shear with NSM FRP reinforcement”, Construction and Building Materials, 23, 1555-1567, 2009. https://doi.org/10.1016/j.conbuildmat.2007.08.014.
Sharaky, I.A., Torres, L., Baena, M., and Vilanova, I., “Effect of different material and construction details on the bond behaviour of NSM FRP bars in concrete”, Construction and Building Materials, 38, 890-902, 2013. https://doi.org/10.1016/j.conbuildmat.2012.09.015.
Sharaky, I.A., Torres, L., and Sallam, H., “Experimental and analytical investigation into the flexural performance of RC beams with partially and fully bonded NSM FRP bars/strips”, Composite Structures, 122, 113-126, 2015. https://doi.org/10.1016/j.compstruct.2014.11.057.
Sharaky, I.A., Torres, L., Baena, M., and Miàs, C., “An experimental study of different factors affecting the bond of NSM FRP bars in concrete”, Composite Structures, 99, 350-365, 2013. https://doi.org/10.1016/j.compstruct.2012.12.014.
Tang, W., Balendran, R., Nadeem, A., and Leung, H., “Flexural strengthening of reinforced lightweight polystyrene aggregate concrete beams with near-surface mounted GFRP bars”, Building and environment, 41, 1381-1393, 2006. https://doi.org/10.1016/j.buildenv.2005.05.029.
Wang, B., Teng, J.-G., De Lorenzis, L., Zhou, L.-M., Ou, J., Jin, W., and Lau, K., “Strain monitoring of RC members strengthened with smart NSM FRP bars”, Construction and Building Materials, 23, 1698-1711, 2009. https://doi.org/10.1016/j.conbuildmat.2008.07.027.
Wu, G., Dong, Z.-Q., Wu, Z.-S., and Zhang, L.-W., “Performance and parametric analysis of flexural strengthening for RC beams with NSM-CFRP bars”, Journal of Composites for Construction, 18, 04013051, 2013. https://doi.org/10.24200/sci.2017.4207.
Bianco, V., Barros, J.A., and Monti, G., “Bond model of NSM-FRP strips in the context of the shear strengthening of RC beams”, Journal of Structural Engineering, 135, 619-631, 2009. https://doi.org/10.1007/978-3-642-17487-2_173.
Bianco, V., Monti, G., and Barros, J.A., “Design formula to evaluate the NSM FRP strips shear strength contribution to a RC beam”, Composites Part B: Engineering, 56, 960-971, 2014. https://doi.org/10.1016/j.compositesb.2013.09.001.
Coelho, M.R., Sena-Cruz, J.M., and Neves, L.A., “A review on the bond behavior of FRP NSM systems in concrete”, Construction and Building Materials, 93, 1157-1169, 2015. https://doi.org/10.1016/j.conbuildmat.2015.05.010.
Hawileh, R.A., “Nonlinear finite element modeling of RC beams strengthened with NSM FRP rods”, Construction and Building Materials, 27, 461-471, 2012. https://doi.org/10.1016/j.conbuildmat.2011.07.018.
Kara, I.F., Ashour, A.F., and Köroğlu, M.A., “Flexural behavior of hybrid FRP/steel reinforced concrete beams”, Composite Structures, 129, 111-121, 2015. https://doi.org/10.1016/j.compstruct.2015.03.073.
Kaveh, A., Bakhshpoori, T., and Hamze-Ziabari, S., “New model derivation for the bond behavior of NSM FRP systems in concrete”, Iranian Journal of Science and Technology, Transactions of Civil Engineering, 41, 249-262, 2017. https://doi.org/10.1007/s40996-017-0058-z.
Seo, S.-Y., Lee, M.S., and Feo, L., “Flexural analysis of RC beam strengthened by partially de-bonded NSM FRP strip”, Composites Part B: Engineering, 101, 21-30, 2016. https://doi.org/10.1016/j.compositesb.2016.06.056.
Teng, J.G., Zhang, S.S., Dai, J., and Chen, J., “Three-dimensional meso-scale finite element modeling of bonded joints between a near-surface mounted FRP strip and concrete”, Computers & structures, 117, 105-117, 2013. https://doi.org/10.1016/j.compstruc.2012.12.002.
Zhang, S.S., and Teng, J.G., “Finite element analysis of end cover separation in RC beams strengthened in flexure with FRP”, Engineering structures, 75, 550-560, 2014. https://doi.org/10.1016/j.engstruct.2014.06.031.
Simulia, D.S., “Abaqus/CAE user's manual”, Providence, RI, Vol., 2007.
DOI: 10.28991/cej-03091126
Refbacks
- There are currently no refbacks.
Copyright (c) 2018 minu panahi
This work is licensed under a Creative Commons Attribution 4.0 International License.
