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<p>This study examines the efficiency of carbon fiber reinforced polymer (CFRP) plies to confine to enhanced the splice region of glass fibre reinforced polymer (GFRP) bars. Also investigate insufficient lap splice (sub-standared laps) of GFRP bars in concrete beams. This study adopted to examin the influence of various parameters on the bonding characteristics of GFRP reinforcing bars in high-strength self-compacting concrete (HSSCC) and to design a new equation for spliced beams that are strengthened by CFRP sheets. Twelve medium-scale GFRP-reinforced concrete beams with dimensions of 1200 mm in length, 200 mm in width and 150 mm in height were evaluated as structures constructed with two tension lap splices and tested under four-point bending up to failure and the last beam was reinforced with continuous GFRP bars (without splicing) for comparison. The test parameters investigated for lap splice length included insufficient lap splices shorter than that recommended by American Concrete Institute Building Code ACI 440.11–22 were 120 mm, 180 mm and 240 mm; another beam was designed with the American Concrete Institute Building Code standard equation over lap length (300 mm) and number of plies (1 and 2 plies) by CFRP sheets on lap splice with a nominal concrete strength of 75 MPa. The test results confirm the insufficient lap splice that strengthening by 1 or 2 plies were effective in enhancing the bond strength and ductility of the failure mode of the tension lap splice. On the other hand, the new splicing technique for GFRP splice laps demonstrated greater efficiency compared to the conventional overlapping bar’s splice method. In addition, it can be concluded that the experimental values were very close to the predicted values from the proposed equation.</p>

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Performance of GFRP spliced rebars in self-compacting concrete beams using a new CFRP sheets strengthening technique

  • 期刊论文

  • 发表日期：

    2025年7月22日

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  • Muna K. Jassim,
  • Akram S. Mahmoud,
  • Mohammed H. Mohana

摘要

This study examines the efficiency of carbon fiber reinforced polymer (CFRP) plies to confine to enhanced the splice region of glass fibre reinforced polymer (GFRP) bars. Also investigate insufficient lap splice (sub-standared laps) of GFRP bars in concrete beams. This study adopted to examin the influence of various parameters on the bonding characteristics of GFRP reinforcing bars in high-strength self-compacting concrete (HSSCC) and to design a new equation for spliced beams that are strengthened by CFRP sheets. Twelve medium-scale GFRP-reinforced concrete beams with dimensions of 1200 mm in length, 200 mm in width and 150 mm in height were evaluated as structures constructed with two tension lap splices and tested under four-point bending up to failure and the last beam was reinforced with continuous GFRP bars (without splicing) for comparison. The test parameters investigated for lap splice length included insufficient lap splices shorter than that recommended by American Concrete Institute Building Code ACI 440.11–22 were 120 mm, 180 mm and 240 mm; another beam was designed with the American Concrete Institute Building Code standard equation over lap length (300 mm) and number of plies (1 and 2 plies) by CFRP sheets on lap splice with a nominal concrete strength of 75 MPa. The test results confirm the insufficient lap splice that strengthening by 1 or 2 plies were effective in enhancing the bond strength and ductility of the failure mode of the tension lap splice. On the other hand, the new splicing technique for GFRP splice laps demonstrated greater efficiency compared to the conventional overlapping bar’s splice method. In addition, it can be concluded that the experimental values were very close to the predicted values from the proposed equation.