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<p>In the present study, carbon fiber-reinforced polymer (CFRP) strips with orthogonal and diagonal configurations, applying grooving method, with or without steel dowels, were employed to enhance the punching shear capacity of reinforced concrete flat slabs. Six simply supported specimens with low punching shear capacity were constructed and subjected to monotonic loading at the mid-point of the slab. One specimen was selected as the control specimen (CS), one strengthened with CFRP strips with orthogonal configuration and the length of same as the slab dimension, one strengthened with short-length CFRP composites with star-shaped configuration, two strengthened with short-length CFRP composites with star-shaped configuration and steel dowels on between strips, and one strengthened with short-length, discontinuous with orthogonal configuration. The increase of ultimate load bearing of aforementioned samples compare to CS, was about 25%, 20%, 44%, 58% and 20% respectively. Applying the grooving method in the specimen strengthened with orthogonal configuration leads to 25% more load-bearing than EBR installation compare to average of literature researches and FRP rupture compare to debonding. In the specimens with star-shaped configurations, and the specimen strengthened with short-length discontinuous with orthogonal configuration, which the identical load-bearing, had less consumption of CFRP composites by 60% and 50% compared to full length orthogonal FRP strips, however 25 percent of load-bearing declination occurred.</p>

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Strengthening of Two-Way RC Flat Slabs for Punching Shear Using Steel Dowels and CFRP Sheet with EBROG and EBRIG Methods: An Experimental Study

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • Reza Zamani,
  • Seyed Behzad Talaeitaba,
  • Davood Mostofinejad

摘要

In the present study, carbon fiber-reinforced polymer (CFRP) strips with orthogonal and diagonal configurations, applying grooving method, with or without steel dowels, were employed to enhance the punching shear capacity of reinforced concrete flat slabs. Six simply supported specimens with low punching shear capacity were constructed and subjected to monotonic loading at the mid-point of the slab. One specimen was selected as the control specimen (CS), one strengthened with CFRP strips with orthogonal configuration and the length of same as the slab dimension, one strengthened with short-length CFRP composites with star-shaped configuration, two strengthened with short-length CFRP composites with star-shaped configuration and steel dowels on between strips, and one strengthened with short-length, discontinuous with orthogonal configuration. The increase of ultimate load bearing of aforementioned samples compare to CS, was about 25%, 20%, 44%, 58% and 20% respectively. Applying the grooving method in the specimen strengthened with orthogonal configuration leads to 25% more load-bearing than EBR installation compare to average of literature researches and FRP rupture compare to debonding. In the specimens with star-shaped configurations, and the specimen strengthened with short-length discontinuous with orthogonal configuration, which the identical load-bearing, had less consumption of CFRP composites by 60% and 50% compared to full length orthogonal FRP strips, however 25 percent of load-bearing declination occurred.