International Journal of Structural Mechanics and Finite Elements
Experimental Investigation on Shear & Flexural Behaviour of GFRP-Reinforced Concrete Beam
Department of Civil Engineering, GHRU Amravati
Abstract
Reinforced concrete (RC) beams are among the most commonly used structural elements in civil engineering
structures. However, the long-term durability of conventional steel reinforcement is often affected by
corrosion when exposed to aggressive environmental conditions, which can significantly reduce the service
life and structural performance of concrete members. In recent years, Glass Fiber Reinforced Polymer
(GFRP) bars have emerged as a promising alternative reinforcement material due to their high tensile
strength, light weight, and excellent resistance to corrosion. The present study focuses on an experimental
investigation of the shear and flexural behavior of reinforced concrete beams reinforced with hybrid steel–
GFRP bars. In this research, several RC beam specimens with identical geometric dimensions are cast using
standard concrete mix proportions. The specimens include conventionally reinforced steel beams as well as
hybrid reinforced beams containing both steel and GFRP bars. After proper curing, the beams are tested under
controlled loading conditions to evaluate their structural performance. Key parameters such as first crack
load, ultimate load-carrying capacity, load–deflection response, stiffness characteristics, crack width
development, crack propagation patterns, and failure modes are carefully monitored and analyzed. The
experimental results are presented through graphical relationships such as load–deflection curves and crack
behavior patterns to facilitate comparison between conventional steel-reinforced beams and hybrid reinforced
beams. The findings of this study provide important insights into the structural behavior of hybrid steel–
GFRP reinforced concrete beams and highlight their potential for enhancing durability. The experimental
results may support the development of improved design strategies and encourage the adoption of hybrid
reinforcement systems for sustainable and corrosion-resistant infrastructure applications in modern
infrastructure systems.
References (1)
- [1] Correiaa S, Cabral-Fonsecab, Brancoa F A, Ferreiraa J G, Eusébiob M I and Rodriguesb M P. (2005) ‘Durability of Glass Fiber Reinforced Polyester (GFRP) Pultruded Profiles Used in Civil Engineering Applications', Composites in Construction, France pp 1-9 [2] Sathish Kumar and Naveen. (2014) ‘Comparative effects of using recycled CFRP and GFRP Fibers on fresh-and hardened-state properties of self-compacting concretes: a review’, Reinforced plastics and composites, Vol 33, pp 1258-1275 [3] Deng X., Liu Y., Zhou Z., Experimental study on flexural performance of GFRP-based steel sandwich composite beams, Engineering Structures, vol. 295, pp. 116902–116915, Feb 2024. [4] Mai G., Nguyen T., Phan D., Shear performance of FRP reinforced concrete beams: A state-of-the art review, Composite Structures, vol. 325, pp. 117558–117575, Jan 2024. [5] Kinjawadekar T.A., Patil V.S., Review on flexural behavior of GFRP reinforced concrete beams, International Journal of Civil Engineering and Technology, vol. 14, no. 3, pp. 112–121, May 2023. [6] He J., Liu S., Zhao W., Shear behavior of concrete beams reinforced with hybrid GFRP-steel stirrups, Journal of Composites for Construction, vol. 29, no. 1, pp. 04025001–04025013, Jan 2025. [7] Alsuhaibani E., Al-Salloum Y., Abbas H., Experimental study on flexural performance of hybrid steel– GFRP reinforced beams, Buildings, vol. 15, no. 2, pp. 215–228, Feb 2025. [8] Jain, S., & Sharma, R., "Comparative study of GFRP and steel reinforced beams," International Journal of Civil Engineering Research, vol. 9, no. 3, pp. 211–219, 2018. [9] Murthy, C. V., et al., "Seismic performance of GFRP reinforced concrete beams under cyclic loading," Materials Today: Proceedings, vol. 28, pp. 2120–2128, 2020. [10] Zhang P., Xu J., Li H., Wang Y., Flexural behavior of GFRP reinforced concrete beams with hybrid ECC/CFRP formwork, Construction and Building Materials, vol. 287, pp. 123012–123023, Mar 2021. [11] Rajkumar R., Mishra S., Kumar A., Influence of fibers on shear behavior of steel and GFRP reinforced beams, Materials Today: Proceedings, vol. 82, pp. 2345–2352, Jun 2024.