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Computers and Concrete Volume 37, Number 1, January 2026 , pages 105-125 DOI: https://doi.org/10.12989/cac.2026.37.1.105 |
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Test and analysis of GFRP reinforced plain and steel fiber concrete deep beams without shear reinforcement |
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Sedat Karaahmetli, Ismail Hakki Cagatay, Serkan Tokgoz, Cengiz Dundar
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| Abstract | ||
| This study investigated the experimental and theoretical shear behavior of plain and steel fiber concrete deep beams reinforced with glass fiber-reinforced polymer bars (GFRP). A total of twelve plain and steel fiber concrete deep beams without shear reinforcement were constructed and tested under four-point loading. The tested beams were analyzed using the strut-and-tie models specified in ACI 318-19 and CSA S806 Codes. The effects of shear span-to-depth ratio (a/d), reinforcement ratio and the influences of steel fibers on the shear behavior of GFRP reinforced concrete deep beams were examined. In addition, a parametric study was also conducted to determine the influences of concrete strength, a/d ratio, and reinforcement ratio on the ultimate load capacity of GFRP-reinforced deep beams. The results showed that the a/d ratio, reinforcement ratio, and inclusion of steel fibers into concrete matrix significantly affected the shear behavior of deep beams. It was concluded that increasing the a/d ratio caused a decrease in the ultimate load capacity of the beams while increasing the concrete strength resulted in an increase in the ultimate load capacity. Increasing the reinforcement ratio increased the ultimate load capacity when using the CSA model. | ||
| Key Words | ||
| deep beam; GFRP reinforcement; shear behavior; steel fiber; strut-and-tie model | ||
| Address | ||
| Sedat Karaahmetli, Serkan Tokgoz: Department of Civil Engineering, Adana Alparslan Turkes Science and Technology University, Adana 01250, Türkiye Ismail Hakki Cagatay: Department of Civil Engineering, Cukurova University, Adana 01330, Türkiye Cengiz Dundar: Department of Civil Engineering, Toros University, Mersin 33210, Türkiye | ||