Redistribution of Moment in Concrete Continuous Beams Reinforced with Steel Rebars and Fiber-Reinforced Polymer
Publication: Practice Periodical on Structural Design and Construction
Volume 27, Issue 4
Abstract
Researchers and industrialist interest in fiber reinforced polymer (FRP) to be used as an alternative material to steel rebars in reinforced concrete structures (RC) steadily increases. That is due to its advantages over steel rebars. Some of these advantages are corrosion resistance, nonconductivity, high tensile strength, and low weight ratio. Several studies have been introduced to study the effect of using FRP rebars instead of steel rebars on the durability problem of reinforced concrete structures under different circumstances, such as bridge decks and roadbeds which may contain a massive amount of steel reinforcement. The reinforced concrete (RC) structure constituted by FRP rebars, called FRP-RC, possess less ductile behavior compared with the conventional reinforced concrete. One of the advantages of the ductility structural system is the ability to redistribute moments over critical sections, which allows more flexibility in structural design. To improve the ductility of FRP-RC, it is proposed to add a certain amount of steel rebars in FRP-RC, so the ductility of steel rebars can reduce the brittleness of FRP, called hybrid section. Eleven 3D models were carried out based on finite element software (ANSYS). Two different types of longitudinal rebars were used (FRP and steel) to reinforce the positive and the negative moments. The validation of numerical results was confirmed by experimental results, then the parametric studies were conducted to study and evaluate the effects of hybrid sections on the redistribution percentage () of continuous RC beam. The results of these models showed that a preferable redistribution percentage could be obtained through an appropriate percentage of steel reinforcement ratio to the FRP reinforcement ratio of hybrid sections.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. (ANSYS models for hybrid section, literature review and verification models with experimental beams.)
References
ACI (American Concrete Institute). 2015. Guide for the design and construction of structural concrete reinforced with fiber-reinforced polymer (FRP) bars. ACI 440.1R-15. Farmington Hills, MI: ACI.
ACI (American Concrete Institute). 2019. Building code requirements for structural concrete. ACI 318-19. Farmington Hills, MI: ACI.
Aiello, M., and L. Ombres. 2000. “Load-deflection analysis of FRP reinforced concrete flexural members.” J. Compos. Constr. 4 (4): 164–171. https://doi.org/10.1061/(ASCE)1090-0268(2000)4:4(164).
Aiello, M., and L. Ombres. 2002. “Structural performances of concrete beams with hybrid (fiber 8 reinforced polymer-steel) reinforcements.” J. Compos. Constr. 6 (2): 133–140. https://doi.org/10.1061/(ASCE)1090-0268(2002)6:2(133).
ANSYS. 2015. ANSYS release 15.2 academic. Finite element analysis system. ANSYS manual, (ANSYS help viewer). Canonsburg, PA: ANSYS.
Araba, A., and A. Ashour. 2018. “Flexural performance of hybrid GFRP-steel reinforced concrete continuous beams.” Composites, Part B 154 (Dec): 321–336. https://doi.org/10.1016/j.compositesb.2018.08.077.
Buyukkaragoz, A. 2010. “Finite element analysis of the beam strengthened with prefabricated reinforced concrete plate.” Sci. Res. Essays 5 (6): 533–544.
El-Mogy, M. 2011. “Behaviour of continuous concrete beams.” Ph.D. thesis, Dept. of Civil Engineering, Univ. of Manitoba.
El-Mogy, M., A. Ragaby, and E. Salakawy. 2010. “Flexural behavior of continuous FRP-reinforced concrete beams.” J. Compos. Constr. 14 (6): 669–680. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000140.
Grace, N. F., A. K. Soliman, G. Abdel-Sayed, and K. R. Saleh. 1998. “Behavior and ductility of simple and continuous FRP reinforced beams.” J. Compos. Constr. 2 (4): 186–194. https://doi.org/10.1061/(ASCE)1090-0268(1998)2:4(186).
Habeeb, M. N., and A. Ashour. 2008. “Flexural behavior of continuous GFRP reinforced concrete.” J. Compos. Constr. 12 (2): 115–124. https://doi.org/10.1061/(ASCE)1090-0268(2008)12:2(115).
Hawileh, R. A., H. A. Musto, 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.
Hognestad, E., N. W. Hanson, and D. McHenry. 1955. “Concrete stress distribution in ultimate strength design.” ACI J. Proc. 52 (4): 455–479.
Kara, I. F., and A. Ashour. 2012. “Flexural performance of FRP reinforced concrete beams.” Compos. Struct. 94 (5): 1616–1625. https://doi.org/10.1016/j.compstruct.2011.12.012.
Kara, I. F., and A. Ashour. 2013. “Moment redistribution in continuous FRP reinforced concrete beam.” Constr. Build. Mater. 49 (Dec): 939–948. https://doi.org/10.1016/j.conbuildmat.2013.03.094.
Kara, I. F., A. Ashour, and M. A. Koroglu. 2015. “Flexural behavior of hybrid FRP/steel reinforced concrete beams.” Compos. Struct. 129 (Oct): 111–121. https://doi.org/10.1016/j.compstruct.2015.03.073.
Lau, D., and H. J. Pam. 2010. “Experimental study of hybrid FRP reinforced concrete beams.” Eng. Struct. 32 (12): 3857–3865. https://doi.org/10.1016/j.engstruct.2010.08.028.
Lou, T., S. Lopes, and A. V. Lopes. 2014. “Evaluation of moment redistribution in normal strength and high strength reinforced concrete beams.” J. Struct. Eng. 140 (10): 04014072. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000994.
Mufti, A. A., J. Newhood, and G. Tadros. 1996. “Deformability versus ductility in concrete beams with FRP reinforcement.” In Proc., 2nd Int. Conf. on Advanced Composite Materials Bridges and Structures, 189–199. Montreal: Canadian Society for Civil Engineering.
Premalatha, J., R. Vengadeshwari, and P. Srihari. 2017. “Finite element modeling and analysis of RC beams with GFRP and steel bars.” Int. J. Civ. Eng. Technol. 8 (9): 671–679.
Qin, R., A. Zhou, and D. Lau. 2017. “Effect of reinforcement ratio on the flexural performance of hybrid FRP reinforced concrete beam.” Composites, Part B 108 (Jan): 200–209. https://doi.org/10.1016/j.compositesb.2016.09.054.
Salama, A. E., M. Hassan, and B. Benmokrane. 2020. “Effect of GFRP shear stirrups on strength of two-way GFRP RC edge slabs: Experimental and finite-element investigations.” J. Struct. Eng. 146 (5): 04020056. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002593.
Scott, R. H., and R. T. Whittle. 2005. “Moment redistribution effects in beams.” Mag. Concr. Res. 57 (1): 9–20. https://doi.org/10.1680/macr.2005.57.1.9.
Willam, K. J., and E. P. Warnke. 1975. “Constitutive model for the triaxial behavior of concrete.” Proc. IABSE 19 (3): 1–30.
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© 2022 American Society of Civil Engineers.
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Received: Jul 7, 2021
Accepted: Apr 17, 2022
Published online: Jun 28, 2022
Published in print: Nov 1, 2022
Discussion open until: Nov 28, 2022
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