Fire Behavior of Concrete Beams Reinforced with Various Combinations of GFRP and Steel

Det Van Doan; Vui Van Cao

doi:10.28991/CEJ-2025-011-05-018

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Det Van Doan 1) Faculty of Civil Engineering, Ho Chi Minh City University of Technology (HCMUT), District 10, Ho Chi Minh City, Vietnam. 2) Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Vietnam.
Vui Van Cao
cvvui@hcmut.edu.vn
1) Faculty of Civil Engineering, Ho Chi Minh City University of Technology (HCMUT), District 10, Ho Chi Minh City, Vietnam. 2) Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Vietnam. https://orcid.org/0000-0003-2575-1540

Vol. 11 No. 5 (2025): May

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This paper investigates the effects of key parameters on the fire resistance of concrete beams reinforced with various combinations of glass fiber-reinforced polymer (GFRP) and steel. The ratio of GFRP area (A_f) to the total area (A) of GFRP and steel varied from 0 to 1, making steel, hybrid GFRP-steel, and GFRP-reinforced concrete (RC) beams. Finite element models of these beams were developed in SAFIR software and verified. The models were then used to analyze the effects of different key parameters on the fire behavior and fire resistance of these beams. The results demonstrated that the fire behavior of these beams was significantly affected by the A_f/A ratio, load ratio, total reinforcement ratio, and concrete cover thickness, while it was marginally affected by steel and concrete strengths. The fire resistance decreased with the increases in load ratio and A_f/A ratio, whereas it increased with the increases in concrete cover thickness or reinforcement ratio. Fire resistance slightly increased with the increase in the tensile strength of steel and slightly decreased with the increase in the compressive strength of concrete. The location arrangement of GFRP and steel bars in cross sections significantly affected the fire behavior and fire resistance of hybrid beams. The deflection rate limit, rather than the deflection limit, decisively governed the fire resistance of concrete beams reinforced with different A_f/Aratios. Regression analyses yielded models for estimating the fire resistance.

Doi: 10.28991/CEJ-2025-011-05-018

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Fire Behavior of Concrete Beams Reinforced with Various Combinations of GFRP and Steel

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