Experimental and numerical investigation on the behavior of reinforced concrete beams retrofitted by sprayed glass fiber-reinforced polymers (SGFRP)

Document Type : Research Paper

Authors

1 Civil engineering faculty- Sahand University of Technology

2 Civil engineering faculty, Sahand University of technology

10.22124/jcr.2024.26007.1634

Abstract

Nowadays, numerous innovative retrofitting methods for concrete members are introduced so as to reduce costs. Spraying fiber-reinforced polymers is a newly proposed method and is gaining high attention since a better bond between the concrete and the adhesive is achieved. In this article, the application of spraying glass fiber-reinforced polymers (SGFRPs) is evaluated and its effects on the behavior of reinforced concrete (RC) beams are investigated. For this purpose, nine concrete beams (200×100×1500 mm) are produced and retrofitted using three and five layers of SGFRP. The RC beams are divided into three categories, namely, beams having shear deficiencies, beams having flexural deficiencies, and beam with no defects. Moreover, the beams are retrofitted using the SGFRP layers. Then, the beams were subjected to the three-point test. The experimental results showed that the SGFRP strengthening method has significantly increased the bearing capacity and energy absorption of the beams. Moreover, the results showed that this retrofitting method possesses a high potential for practical cases. Overall, retrofitting using five layers of SGFRP led to more suitable results. In this regard, the bearing capacity of the beams having flexural, shear deficiencies and beams without deficiencies increased by 82%, 53%, and 48%, respectively. Furthermore, a numerical method in ABAQUS finite element package is presented for modeling the SGFRP strengthening method using user-defined material (UMAT) coding and the accuracy of the method was assessed by comparison against the experimental outcomes. The results indicate the appropriate accuracy of the numerical method.

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References

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