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Corresponding Author

Marwa H. Bondok

Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

This paper discusses the Finite Element analysis (FE) conducted to predict the behavior of Glass Fiber Reinforced Concrete (GFRC) beams without shear reinforcement (stirrups) and strengthen them with proposed techniques to increase their shear strength. for this study, A total of eighteen (18) (120 * 300 * 2200 mm) specimens were modeled using Ansys™ mechanical. The main variables were the percentage of discrete glass fiber in the concrete (0.0, 0.6, and 1.2%), the type of main reinforcing bars (steel or GFRP), the shear strengthening material (GFRP or steel) links, the strengthening systems (side near-surface mounted (SNSM) bars, externally bonded (EB) sheet, or both), various NSM GFRP bars configurations (side bonded links, full wrapped stirrups, side C-shaped stirrups, and side bent bars), the link spacing, the link inclination angle, and the number of bent bars. Each model had a free span of 2000 mm with a constant shear span-to-depth ratio (a/d) of 2.0. The numerical models were verified against experimental results presented in the earlier publication. These results were analyzed to investigate the effect of main variables on shear strength. Increasing the ratio of discrete glass fiber in the R.C beam to 0.6 and 1.2% enhanced the ductility and increase the shear strength by 24% and 32% for steel reinforcement and by 16% and 29% for GFRP reinforcement, respectively. The use of GFRP bars instead of steel bars as the main reinforcement slightly enhanced the shear strength and ductility but decreased the stiffness. the use of various strengthening systems enhanced the shear capacity by a ratio of up to 115%. A new strengthening technique (SNSM bent bars with strips) produced better improvements in terms of shear capacity, ductility, and crack propagation compared to other strengthening techniques. The results of Numerical analyses and the experimental results for eighteen beams were considered, the ratio between them is equivalent by a factor of 0.96 to 1.04.

Keywords

Finite Element (FE) Ansys™ glass fiber reinforced concrete (GFRC) GFRP Shear strength beams without stirrups.

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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