Strengthening of structurally damaged wide shallow RC beams using externally bonded CFRP plates
Reinforced concrete wide shallow beams (WSBs) are commonly used in the joist flooring systems. The structural behavior of WSBs strengthened with carbon fiber reinforced polymer (CFRP) reinforcement was studied on isolated beams and as part of full-scale building. The effect of structural damage on t...
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| Format: | Article |
| Language: | English |
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Marcílio Alves
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| Series: | Latin American Journal of Solids and Structures |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-78252014000600003&lng=en&tlng=en |
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| author | Rajeh A. Al-Zaid Ahmed K. El-Sayed Abdulaziz I. Al-Negheimish Ahmed B. Shuraim Abdulrahman M. Alhozaimy |
| author_facet | Rajeh A. Al-Zaid Ahmed K. El-Sayed Abdulaziz I. Al-Negheimish Ahmed B. Shuraim Abdulrahman M. Alhozaimy |
| author_sort | Rajeh A. Al-Zaid |
| collection | DOAJ |
| description | Reinforced concrete wide shallow beams (WSBs) are commonly used in the joist flooring systems. The structural behavior of WSBs strengthened with carbon fiber reinforced polymer (CFRP) reinforcement was studied on isolated beams and as part of full-scale building. The effect of structural damage on the performance of WSBs flexurally strengthened with CFRP plates was investigated and presented in this paper. Eight full-scale WSBs were tested under four-point bending up to failure. Seven beams were strengthened with CFRP plates bonded to the soffit of the beams and one beam was unstrengthened serving as control. Prior to strengthening, the beams were subjected to different levels of damaging by preloading to 30-95% of the beams' flexural capacity. One beam was fully damaged by preloading to failure and repaired before strengthening by replacing the crushed concrete. The data showed that the pre-damaged strengthened beams exhibited ultimate capacities up to 8% lower than those of the undamaged strengthened beams. However, the load carrying capacities of pre-damaged strengthened beams were more than those predicted by ACI 440 design guide, fib Bulletin 14, and JSCE design recommendations. Both fib Bulletin 14 and JSCE design recommendations gave very conservative predictions with average ratios of experimental to predicted ultimate capacity of 2.02 and 2.35, respectively. More accurate predictions were obtained by ACI 440 design guide as the corresponding ratio was 1.24. These results indicate that strong confidence and reliability can be placed in applying CFRP strengthening to structurally damaged WSBs. |
| first_indexed | 2024-12-21T15:36:37Z |
| format | Article |
| id | doaj.art-7bbee2a724bb40a9b964980d2c64a364 |
| institution | Directory Open Access Journal |
| issn | 1679-7825 |
| language | English |
| last_indexed | 2024-12-21T15:36:37Z |
| publisher | Marcílio Alves |
| record_format | Article |
| series | Latin American Journal of Solids and Structures |
| spelling | doaj.art-7bbee2a724bb40a9b964980d2c64a3642022-12-21T18:58:38ZengMarcílio AlvesLatin American Journal of Solids and Structures1679-782511694696510.1590/S1679-78252014000600003S1679-78252014000600003Strengthening of structurally damaged wide shallow RC beams using externally bonded CFRP platesRajeh A. Al-Zaid0Ahmed K. El-Sayed1Abdulaziz I. Al-Negheimish2Ahmed B. Shuraim3Abdulrahman M. Alhozaimy4King Saud UniversityKing Saud UniversityKing Saud UniversityKing Saud UniversityKing Saud UniversityReinforced concrete wide shallow beams (WSBs) are commonly used in the joist flooring systems. The structural behavior of WSBs strengthened with carbon fiber reinforced polymer (CFRP) reinforcement was studied on isolated beams and as part of full-scale building. The effect of structural damage on the performance of WSBs flexurally strengthened with CFRP plates was investigated and presented in this paper. Eight full-scale WSBs were tested under four-point bending up to failure. Seven beams were strengthened with CFRP plates bonded to the soffit of the beams and one beam was unstrengthened serving as control. Prior to strengthening, the beams were subjected to different levels of damaging by preloading to 30-95% of the beams' flexural capacity. One beam was fully damaged by preloading to failure and repaired before strengthening by replacing the crushed concrete. The data showed that the pre-damaged strengthened beams exhibited ultimate capacities up to 8% lower than those of the undamaged strengthened beams. However, the load carrying capacities of pre-damaged strengthened beams were more than those predicted by ACI 440 design guide, fib Bulletin 14, and JSCE design recommendations. Both fib Bulletin 14 and JSCE design recommendations gave very conservative predictions with average ratios of experimental to predicted ultimate capacity of 2.02 and 2.35, respectively. More accurate predictions were obtained by ACI 440 design guide as the corresponding ratio was 1.24. These results indicate that strong confidence and reliability can be placed in applying CFRP strengthening to structurally damaged WSBs.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-78252014000600003&lng=en&tlng=enCFRP reinforcementConcrete beamsStrengtheningStructural damagedebonding |
| spellingShingle | Rajeh A. Al-Zaid Ahmed K. El-Sayed Abdulaziz I. Al-Negheimish Ahmed B. Shuraim Abdulrahman M. Alhozaimy Strengthening of structurally damaged wide shallow RC beams using externally bonded CFRP plates Latin American Journal of Solids and Structures CFRP reinforcement Concrete beams Strengthening Structural damage debonding |
| title | Strengthening of structurally damaged wide shallow RC beams using externally bonded CFRP plates |
| title_full | Strengthening of structurally damaged wide shallow RC beams using externally bonded CFRP plates |
| title_fullStr | Strengthening of structurally damaged wide shallow RC beams using externally bonded CFRP plates |
| title_full_unstemmed | Strengthening of structurally damaged wide shallow RC beams using externally bonded CFRP plates |
| title_short | Strengthening of structurally damaged wide shallow RC beams using externally bonded CFRP plates |
| title_sort | strengthening of structurally damaged wide shallow rc beams using externally bonded cfrp plates |
| topic | CFRP reinforcement Concrete beams Strengthening Structural damage debonding |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-78252014000600003&lng=en&tlng=en |
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