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Structural Engineering and Mechanics Volume 44, Number 6, December25 2012 , pages 705-733 DOI: https://doi.org/10.12989/sem.2012.44.6.705 |
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Interfacial stress assessment at the cracked zones in CFRP retrofitted RC beams |
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Ata Hojatkashani and Mohammad Zaman Kabir
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| Abstract | ||
| In this work, an experimental examination was carried out to study interfacial stresses developed at the junction zones between carbon fiber reinforced plastic (CFRP) fabrics (~1 mm thickness) and tensile concrete portion in CFRP retrofitted RC beams. In this respect, initially six similar RC beams of 150 x 150 x 1000 mm dimensions were prepared. Three of which were strengthened with CFRP fabrics at the tensile side of the beams. Furthermore, a notch was cut at the center of the bottom surface for all of the studied beams. The notch was 15 mm deep and ran across the full width of tension side of the beams. The mentioned interfacial stresses could be calculated from strains measured using strain gauges mounted on the interface zone of the tensile concrete and the CFRP sheet. Based on the results obtained, it is shown that interfacial stresses developed between CFRP fabrics and RC beam had a noticeable effect on debonding failure mode of the latter. The load carrying capacity of CFRP strengthened RC specimens increased ~75% compared to that of the control RC beams. This was attributed to the enhancement of flexural mode of the former. Finally, finite element analysis was also utilized to verify the measured experimental results. | ||
| Key Words | ||
| experimental examination; CFRP strengthened RC beam; interfacial stress; critical zones; debonding failure mode; finite element analysis | ||
| Address | ||
| Ata Hojatkashani: University of Applied Science and Technology, Tehran, Iran Mohammad Zaman Kabir: Civil Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran | ||