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<p>The use of glass fiber reinforced polymer (GFRP) bars can effectively improve both the strength and durability of reinforced concrete (RC) slabs, but it is not possible to estimate the extent to which the strength and durability of these slabs will be affected when exposed to moderate heating. This study investigates the effect of moderately-high temperatures on the structural behavior of RC one-way slabs reinforced with GFRP bars under monotonic loading. Self-compacting concrete one-way slab specimens (600 × 300 × 50&#xa0;mm) with concrete strength 25&#xa0;MPa, were tested at different temperatures (ambient temperature, 80&#xa0;°C, and 150&#xa0;°C) while subjected to monotonic loading until failure. The mechanical properties of concrete, including compressive strength, modulus of rupture, and modulus of elasticity, were evaluated, showing significant degradation with increasing temperature. Also, the ultimate load, deflection, ductility, Average flexural stiffness, and energy absorption capacity. At 150&#xa0;°C, compressive strength decreases by 14.2%. The load-bearing capacity of GFRP-reinforced slabs was also affected, with the ultimate load decreasing by roughly 20% at 150&#xa0;°C compared to room temperature. Deflection at failure increases, indicating reduced stiffness and greater deformability under thermal exposure. The failure mode is always controlled by bending in all specimens, with mid-span cracking and concrete crushing. The findings highlight the detrimental impact of heating even under moderately-high temperatures on the structural performance of GFRP-reinforced slabs, emphasizing the need for thermal considerations in design and durability assessments. This study contributes to a better understanding of fire resistance in GFRP-reinforced concrete structures, supporting future design guidelines.</p>

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Effect of moderate heating on concrete one-way slabs reinforced with GFRP bars under monotonic loading

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • Akeel A. Jias,
  • Abdul Qader Nihad Noori

摘要

The use of glass fiber reinforced polymer (GFRP) bars can effectively improve both the strength and durability of reinforced concrete (RC) slabs, but it is not possible to estimate the extent to which the strength and durability of these slabs will be affected when exposed to moderate heating. This study investigates the effect of moderately-high temperatures on the structural behavior of RC one-way slabs reinforced with GFRP bars under monotonic loading. Self-compacting concrete one-way slab specimens (600 × 300 × 50 mm) with concrete strength 25 MPa, were tested at different temperatures (ambient temperature, 80 °C, and 150 °C) while subjected to monotonic loading until failure. The mechanical properties of concrete, including compressive strength, modulus of rupture, and modulus of elasticity, were evaluated, showing significant degradation with increasing temperature. Also, the ultimate load, deflection, ductility, Average flexural stiffness, and energy absorption capacity. At 150 °C, compressive strength decreases by 14.2%. The load-bearing capacity of GFRP-reinforced slabs was also affected, with the ultimate load decreasing by roughly 20% at 150 °C compared to room temperature. Deflection at failure increases, indicating reduced stiffness and greater deformability under thermal exposure. The failure mode is always controlled by bending in all specimens, with mid-span cracking and concrete crushing. The findings highlight the detrimental impact of heating even under moderately-high temperatures on the structural performance of GFRP-reinforced slabs, emphasizing the need for thermal considerations in design and durability assessments. This study contributes to a better understanding of fire resistance in GFRP-reinforced concrete structures, supporting future design guidelines.