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Structural Engineering and Mechanics Volume 42, Number 6, June25 2012 , pages 799-813 DOI: https://doi.org/10.12989/sem.2012.42.6.799 |
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Flexural performance of fire damaged and rehabilitated two span reinforced concrete slabs and beams |
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Jiang-Tao Yu, Yuan Liu, Zhou-Dao Lu and Kai Xiang
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| Abstract | ||
| Five two-span reinforced concrete (RC) slabs and seven two-span RC beams were tested under the ISO 834 standard fire with different durations. CFRP strengthening was then applied to some of the specimens after the damaged concrete was removed from the specimens and replaced with polymer mortar. All the specimens were loaded to failure to investigate the influence of fire-damage and the effectiveness of strengthening methods. Test results indicated that the flexural capacities of specimens decrease with the fire duration increases. Moreover, fire exposure had more significant effect on the flexural rigidity than on the bearing capacity of the specimens. After rehabilitation, the bearing capacities of specimens reached or even exceeded that of the reference RC specimen, and the strengthening methods seemed to have limited effect on flexural rigidity recovery. From the analysis of moment redistribution of tested beams, elevated temperature is found having different impacts on sagging moment region and hogging moment region. The damage of RC continuous member is definitely a comprehensive response of different regions. | ||
| Key Words | ||
| fire damage; concrete; continuous members; rehabilitation; flexural rigidity; bearing capacity | ||
| Address | ||
| Jiang-Tao Yu, Yuan Liu, Zhou-Dao Lu: Research Institute of Engineering & Disaster Reduction, Tongji University, Siping Rd, Shanghai, 200092, China Kai Xiang: Tianjin Fire Research Institution of the Ministry of Public Security, Weijin Rd, Tianjin, 300000, China | ||