Flexural Strengthening of Reinforced Concrete Beams with Longitudinal Circular Hole Using Near-Surface Mounted CFRP Strips
Publication: Practice Periodical on Structural Design and Construction
Volume 27, Issue 2
Abstract
The electromechanical piping systems of buildings either hang or pass through reinforced concrete (RC) beams and thus induce longitudinal and transverse holes. According to the literature, the small longitudinal hole has a minor effect on the strength and stiffness of the RC beam and thus can be ignored. However, a large hole has a significant impact on strength and stiffness and should be considered in the design. The reduction in stiffness and strength of RC beams with a large longitudinal hole can be recovered with fiber-reinforced polymer (FRP) composite material. This paper aims to study the effectiveness of different strengthening schemes with near-surface mounted carbon FRP (NSM-CFRP) for simply-supported RC beams with a longitudinal circular hole. The nonlinear finite-element (NLFE) model was proposed and then validated with 10 experimental tests from literature and in house by the authors. The NLFE model was employed to study the key parameters affecting the hollow RC beams, including the hole size, location, and strengthening with the NSM-CFRP strips scheme. The results showed that for the unstrengthen RC beams with a large hole, the optimal location was near the neutral axis with minimal reduction in strength and stiffness. For the same number of NSM-CFRP strips, the bottom strengthening scheme was less effective than the side scheme. The effectiveness of the combined (bottom and sides) strengthening schemes depended on the hole location, with the optimal hole location at the bottom compared to the middle of the beam.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors acknowledge the technical support provided by the Jordan University of Science and Technology.
References
Abaqus FEA. 2017. Documentation: ABAQUS theory manual, elements. Providence, RI: Abaqus Inc.
Abtan, Y. G., and H. D. AbdulJabbar. 2019. “Experimental study to investigate the effect of longitudinal and transverse openings on the structural behavior of high strength self compacting reinforced concrete beams.” J. Eng. Sustainable Dev. 2019 (1): 66–79. https://doi.org/10.31272/jeasd.23.1.5.
Ahmed, A., M. M. Fayyadh, S. Naganathan, and K. Nasharuddin. 2012. “Reinforced concrete beams with web openings: A state of the art review.” Mater. Des. 40 (Sep): 90–102. https://doi.org/10.1016/j.matdes.2012.03.001.
Al-Gasham, T. S. S. 2015. “Reinforced concrete moderate deep beams with embedded PVC pipes.” J. Eng. Sci. 3 (1): 19–29. https://doi.org/10.31185/ejuow.Vol3.Iss1.32.
Alnuaimi, A. S., K. S. Al-Jabri, and A. Hago. 2008. “Comparison between solid and hollow reinforced concrete beams.” Mater. Struct. 41 (2): 269–286. https://doi.org/10.1617/s11527-007-9237-x.
Alshimmeri, A. J. H., and H. N. G. Al-Maliki. 2014. “Structural behavior of reinforced concrete hollow beams under partial uniformly distributed load.” J. Eng. 20 (7): 130–145.
Ashteyat, A. M., R. Haddad, and Y. T. Obaidat. 2020. “Repair of heat-damaged SCC cantilever beams using SNSM CFRP strips.” Structures 24 (Apr): 151–162. https://doi.org/10.1016/j.istruc.2020.01.005.
Balaji, G., and R. Vetturayasudharsanan. 2020. “Experimental investigation on flexural behaviour of RC hollow beams.” Mater. Today: Proc. 21 (Jan): 351–356. https://doi.org/10.1016/j.matpr.2019.05.461.
Barris, C., P. Sala, J. Gómez, and L. Torres. 2020. “Flexural behaviour of FRP reinforced concrete beams strengthened with NSM CFRP strips.” Compos. Struct. 241 (Jun): 112059. https://doi.org/10.1016/j.compstruct.2020.112059.
Chin, S. C., N. Shafiq, and M. F. Nuruddin. 2012. “Strengthening of RC beams with large openings in shear by CFRP laminates: Experiment and 2D nonlinear finite element analysis.” Res. J. Appl. Sci. Eng. Technol. 4 (9): 1172–1180.
Chin, S. C., N. Shafiq, and M. F. Nuruddin. 2016. “Behaviour of RC beams with CFRP-strengthened openings.” Struct. Concr. 17 (1): 32–43. https://doi.org/10.1002/suco.201400111.
De Lorenzis, L., and J. G. Teng. 2007. “Near-surface mounted FRP reinforcement: An emerging technique for strengthening structures.” Composites, Part B 38 (2): 119–143. https://doi.org/10.1016/j.compositesb.2006.08.003.
El-Hacha, R., and S. H. Rizkalla. 2004. “Near-surface-mounted fiber-reinforced polymer reinforcements for flexural strengthening of concrete structures.” Struct. J. 101 (5): 717–726.
Fernandes, P. M. G., P. M. Silva, L. L. G. Correia, and J. Sena-Cruz. 2015. “Durability of an epoxy adhesive and a CFRP laminate under different exposure conditions.” In Proc., 3rd Conf. on Smart Monitoring, Assessment and Rehabilitation of Civil Structures. Braga, Portugal: Univ. of Minho.
Hassan, N. Z., H. M. Ismael, and A. M. Salman. 2018. “Study behavior of hollow reinforced concrete beams.” Int. J. Curr. Eng. Technol. 8 (6): 1640–1651.
Hawileh, R. A., H. A. Musto, J. A. Abdalla, and M. Z. Naser. 2019. “Finite element modeling of reinforced concrete beams externally strengthened in flexure with side-bonded FRP laminates.” Composites, Part B 173 (Sep): 106952. https://doi.org/10.1016/j.compositesb.2019.106952.
Joy, J., and R. Rajeev. 2014. “Effect of reinforced concrete beam with hollow neutral axis.” Int. J. Sci. Res. Dev. 2 (10): 441–448.
Jung, W., J. Park, J. Kang, and M. Keum. 2017. “Flexural behavior of concrete beam strengthened by near-surface mounted CFRP reinforcement using equivalent section model.” Adv. Mater. Sci. Eng. 2017 (1): 1–16. https://doi.org/10.1155/2017/9180624.
Kanna, M. D., and M. Arun. 2021. “Effects of longitudinal and transverse direction opening in reinforced concrete beam: The state of review.” In Proc., IOP Conf. Series: Materials Science and Engineering, 012049. Bristol, UK: IOP Publishing.
Khalifa, A. M. 2016. “Flexural performance of RC beams strengthened with near surface mounted CFRP strips.” Alexandria Eng. J. 55 (2): 1497–1505. https://doi.org/10.1016/j.aej.2016.01.033.
Mander, J. B., M. J. N. Priestley, and R. Park. 1988. “Theoretical stress-strain model for confined concrete.” J. Struct. Eng. 114 (8): 1804–1826. https://doi.org/10.1061/(ASCE)0733-9445(1988)114:8(1804).
Mirrashid, M., and H. Naderpour. 2020. “Recent trends in prediction of concrete elements behavior using soft computing (2010–2020).” Arch. Comput. Methods Eng. 28 (4): 3307–3327. https://doi.org/10.1007/s11831-020-09500-7.
Murugesan, A., and A. Narayanan. 2017. “Influence of a longitudinal circular hole on flexural strength of reinforced concrete beams.” Pract. Period. Struct. Des. Constr. 22 (2): 4016021. https://doi.org/10.1061/(ASCE)SC.1943-5576.0000307.
Murugesan, A., and A. Narayanan. 2018. “Deflection of reinforced concrete beams with longitudinal circular hole.” Pract. Period. Struct. Des. Constr. 23 (1): 4017034. https://doi.org/10.1061/(ASCE)SC.1943-5576.0000356.
Obaidat, Y. T., S. Heyden, and O. Dahlblom. 2010. “The effect of CFRP and CFRP/concrete interface models when modelling retrofitted RC beams with FEM.” Compos. Struct. 92 (6): 1391–1398. https://doi.org/10.1016/j.compstruct.2009.11.008.
Oukaili, N. K., and A. H. Al-Shammari. 2014. “CFRP strengthening of RC beams with multiple openings subjected to static and impact loads.” Adv. Struct. Eng. 17 (12): 1747–1760. https://doi.org/10.1260/1369-4332.17.12.1747.
Panahi, M., and M. Izadinia. 2018. “A parametric study on the flexural strengthening of reinforced concrete beams with near surface mounted FRP bars.” Civ. Eng. J. 4 (8): 1917. https://doi.org/10.28991/cej-03091126.
Sabau, C., C. Popescu, G. Sas, J. W. Schmidt, T. Blanksvärd, and B. Täljsten. 2018. “Strengthening of RC beams using bottom and side NSM reinforcement.” Composites, Part B 149 (Sep): 82–91. https://doi.org/10.1016/j.compositesb.2018.05.011.
Sharaky, I. A., L. Torres, J. Comas, and C. Barris. 2014. “Flexural response of reinforced concrete (RC) beams strengthened with near surface mounted (NSM) fibre reinforced polymer (FRP) bars.” Compos. Struct. 109 (Mar): 8–22. https://doi.org/10.1016/j.compstruct.2013.10.051.
Tsai, W. T. 1988. “Uniaxial compressional stress-strain relation of concrete.” J. Struct. Eng. 114 (9): 2133–2136. https://doi.org/10.1061/(ASCE)0733-9445(1988)114:9(2133).
Varghese, N., and A. Joy. 2016. “Flexural behaviour of reinforced concrete beam with hollow core at various depth.” Int. J. Sci. Res. 5 (5): 741–746.
Wong, M. B. 2011. Plastic analysis and design of steel structures. Oxford, UK: Butterworth-Heinemann.
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Published In
Practice Periodical on Structural Design and Construction
Volume 27 • Issue 2 • May 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Oct 1, 2020
Accepted: Oct 10, 2021
Published online: Dec 17, 2021
Published in print: May 1, 2022
Discussion open until: May 17, 2022
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