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Title |
An Estimate of Flexural Strength for Reinforce Concrete Beams Strengthened with CFRP Sheets
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Keywords |
탄소섬유복합재 ; 철근콘크리트 교량 ; 보강 ; 변형률분포 ; 보강설계식 Carbon fiber reinforced polymer ; reinforced concrete bridge ; strengthening ; strain distribution ; design formula |
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Abstract |
Carbon fiber reinforced polymer (CFRP) sheets are becoming increasingly popular for strengthening deteriorated concrete bridges due to their excellent strength and stiffness-to-weight ratio, corrosion resistance, and convenience of construction work. The purpose of this study is to compare the performance of CFRP-strengthened reinforced concrete (RC) beams and to develop a new design formula. Simple beams with 3 m span length were tested to investigate the effect of reinforcing steel ratio and CFRP-reinforcing ratio on the flexural behavior of strengthened RC beams. The test results were analyzed with the special emphasis on the failure mode, the maximum load, and the strain distribution in the section. It is shown that the strain of the strengthened beams is not linearly distributed in the section. A new design formula based on the non-linear distribution of the strain has been derived and showed that it has a good agreement with the various domestic and foreign test results.
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