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<p>Given the limited number of studies focusing on the use of externally bonded basalt fiber-reinforced polymer (EB-BFRP) composites for shear strengthening, this experimental study evaluates their effectiveness in enhancing the shear performance of shear-deficient reinforced concrete (RC) beams. The objective is to examine the impact of key parameters such as longitudinal reinforcement ratio, strengthening schemes, shear span-to-depth ratio, and end-anchorage configuration. Eight shear-deficient RC beams, each measuring 150&#xa0;mm in width, 200&#xa0;mm in height, and 2000&#xa0;mm in length, were prepared and tested under four-point bending. The results demonstrated a 23–76% increase in load-carrying capacity due to EB-BFRP strengthening, with the extent of improvement influenced by the selected parameters. EB-BFRP application also led to improvements in initial cracking load, energy absorption capacity, and overall beam stiffness. The use of mechanical end-anchorage proved particularly effective, enhancing the energy absorption by 65% and shifting the failure mode from debonding to fiber rupture. The strengthening was especially effective in specimens with lower longitudinal reinforcement ratios and lower a/d ratios. Furthermore, a comparison with ten widely used design guidelines revealed that most provided conservative estimates, particularly for fully wrapped specimens. These findings support the potential of basalt fiber sheets as a sustainable and effective alternative to traditional FRP materials like glass and carbon fibers.</p>

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Basalt Fiber Sheet Retrofit for Shear Strengthening of RC Beams

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • S. Kar,
  • K. C. Biswal

摘要

Given the limited number of studies focusing on the use of externally bonded basalt fiber-reinforced polymer (EB-BFRP) composites for shear strengthening, this experimental study evaluates their effectiveness in enhancing the shear performance of shear-deficient reinforced concrete (RC) beams. The objective is to examine the impact of key parameters such as longitudinal reinforcement ratio, strengthening schemes, shear span-to-depth ratio, and end-anchorage configuration. Eight shear-deficient RC beams, each measuring 150 mm in width, 200 mm in height, and 2000 mm in length, were prepared and tested under four-point bending. The results demonstrated a 23–76% increase in load-carrying capacity due to EB-BFRP strengthening, with the extent of improvement influenced by the selected parameters. EB-BFRP application also led to improvements in initial cracking load, energy absorption capacity, and overall beam stiffness. The use of mechanical end-anchorage proved particularly effective, enhancing the energy absorption by 65% and shifting the failure mode from debonding to fiber rupture. The strengthening was especially effective in specimens with lower longitudinal reinforcement ratios and lower a/d ratios. Furthermore, a comparison with ten widely used design guidelines revealed that most provided conservative estimates, particularly for fully wrapped specimens. These findings support the potential of basalt fiber sheets as a sustainable and effective alternative to traditional FRP materials like glass and carbon fibers.