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<p>This paper investigates the influence of concrete cover thickness, fire exposure time, and cooling method on the dynamic and static performance of concrete beams. A total of 14 reinforced concrete (RC) beams were examined through experimental and theoretical research to determine the key factors affecting their flexural performance. The results indicated that cooling the specimens with water resulted in a more rapid temperature drop, leading to cracking and spalling. Furthermore, the use of water cooling after 120&#xa0;min of fire exposure may have caused brittle failure, significantly reducing the deformation performance of the beams. Prolonged fire exposure resulted in a decrease in the bearing capacity and stiffness of the specimens, which were reduced by 35 and 45%, respectively, after 120&#xa0;min. After the fire exposure, the flexural capacity and stiffness of naturally cooled beams were significantly greater than those of water-sprayed cooled beams. The amplitude of the time-domain curve for the water-cooled beam was higher than that of the naturally cooled beam, while its fundamental frequency exhibited a more pronounced decrease. Finally, a simplified method for predicting flexural stiffness was proposed, with calculated values demonstrating good agreement with experimental results. Additionally, the existing codes could calculate the flexural capacity of RC beams after fire under different cooling methods, but the values predicted for water-cooled beams were found to be overly conservative.</p>

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Dynamic and Static Performance Analysis of Reinforced Concrete Beams Affected by Fire Exposure and Cooling Methods

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Hua Rong,
  • Kang Li,
  • Meng Yang,
  • Xuyang Gao,
  • Caiwei Liu,
  • Jijun Miao

摘要

This paper investigates the influence of concrete cover thickness, fire exposure time, and cooling method on the dynamic and static performance of concrete beams. A total of 14 reinforced concrete (RC) beams were examined through experimental and theoretical research to determine the key factors affecting their flexural performance. The results indicated that cooling the specimens with water resulted in a more rapid temperature drop, leading to cracking and spalling. Furthermore, the use of water cooling after 120 min of fire exposure may have caused brittle failure, significantly reducing the deformation performance of the beams. Prolonged fire exposure resulted in a decrease in the bearing capacity and stiffness of the specimens, which were reduced by 35 and 45%, respectively, after 120 min. After the fire exposure, the flexural capacity and stiffness of naturally cooled beams were significantly greater than those of water-sprayed cooled beams. The amplitude of the time-domain curve for the water-cooled beam was higher than that of the naturally cooled beam, while its fundamental frequency exhibited a more pronounced decrease. Finally, a simplified method for predicting flexural stiffness was proposed, with calculated values demonstrating good agreement with experimental results. Additionally, the existing codes could calculate the flexural capacity of RC beams after fire under different cooling methods, but the values predicted for water-cooled beams were found to be overly conservative.