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Performance of reinforced concrete slabs strengthened with different types and configurations of CFRP

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Title: Performance of reinforced concrete slabs strengthened with different types and configurations of CFRP
Authors: Al-Rousan, R.1 rzalrousan@just.edu.jo, Issa, M.2, Shabila, H.2
Source: Composites: Part B, Engineering. Mar2012, Vol. 43 Issue 2, p510-521. 12p.
Subjects: Performance evaluation, Reinforced concrete, Strengthening mechanisms in solids, Carbon fiber-reinforced plastics, Concrete slabs, Nonlinear theories, Finite element method, Microfabrication, Strains & stresses (Mechanics), Mechanical loads
Abstract: Abstract: A total of eight reinforced concrete slabs, 2440×600×125mm strengthened with different layers and configurations of CFRP sheets were fabricated and tested. In addition, nonlinear finite element analysis (NLFEA) using ANSYS package was used to simulate the behavior of the test specimens. After reasonable validation of NLFEA with the experimental test results of companion slabs, NLFEA was expanded to provide a parametric study of eighteen slabs. The load–deflection, load strain, and failure modes obtained from the experimental test results and the NLFEA evidently confirmed that strengthening of under-reinforced concrete slabs with CFRP improves the flexural strength capacity and reduce the ductility. This was observed for both types of CFRP. The increase in the flexural strength and the reduction in the ductility increased with the increase in the number of CFRP layers. It was concluded that CFRP strengthening of slabs could be categorized as effective, economical, and successful only if substantial increase in the flexural strength capacity is achieved without changing the failure mode to a shear failure mode at the face of the supports or to a compression failure mode. Comparison between the two CFRP types, for almost equivalent applied area of CFRP, showed that the type of CFRP has significant influence on the behavior of the strengthened slabs. The difference is attributed to the difference in the mechanical properties and the bonding quality of the CFRP material. [Copyright &y& Elsevier]
Copyright of Composites: Part B, Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 71336471
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Performance of reinforced concrete slabs strengthened with different types and configurations of CFRP
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  Data: <searchLink fieldCode="AR" term="%22Al-Rousan%2C+R%2E%22">Al-Rousan, R.</searchLink><relatesTo>1</relatesTo><i> rzalrousan@just.edu.jo</i><br /><searchLink fieldCode="AR" term="%22Issa%2C+M%2E%22">Issa, M.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Shabila%2C+H%2E%22">Shabila, H.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Composites%3A+Part+B%2C+Engineering%22">Composites: Part B, Engineering</searchLink>. Mar2012, Vol. 43 Issue 2, p510-521. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Performance+evaluation%22">Performance evaluation</searchLink><br /><searchLink fieldCode="DE" term="%22Reinforced+concrete%22">Reinforced concrete</searchLink><br /><searchLink fieldCode="DE" term="%22Strengthening+mechanisms+in+solids%22">Strengthening mechanisms in solids</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+fiber-reinforced+plastics%22">Carbon fiber-reinforced plastics</searchLink><br /><searchLink fieldCode="DE" term="%22Concrete+slabs%22">Concrete slabs</searchLink><br /><searchLink fieldCode="DE" term="%22Nonlinear+theories%22">Nonlinear theories</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Microfabrication%22">Microfabrication</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+loads%22">Mechanical loads</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Abstract: A total of eight reinforced concrete slabs, 2440×600×125mm strengthened with different layers and configurations of CFRP sheets were fabricated and tested. In addition, nonlinear finite element analysis (NLFEA) using ANSYS package was used to simulate the behavior of the test specimens. After reasonable validation of NLFEA with the experimental test results of companion slabs, NLFEA was expanded to provide a parametric study of eighteen slabs. The load–deflection, load strain, and failure modes obtained from the experimental test results and the NLFEA evidently confirmed that strengthening of under-reinforced concrete slabs with CFRP improves the flexural strength capacity and reduce the ductility. This was observed for both types of CFRP. The increase in the flexural strength and the reduction in the ductility increased with the increase in the number of CFRP layers. It was concluded that CFRP strengthening of slabs could be categorized as effective, economical, and successful only if substantial increase in the flexural strength capacity is achieved without changing the failure mode to a shear failure mode at the face of the supports or to a compression failure mode. Comparison between the two CFRP types, for almost equivalent applied area of CFRP, showed that the type of CFRP has significant influence on the behavior of the strengthened slabs. The difference is attributed to the difference in the mechanical properties and the bonding quality of the CFRP material. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Composites: Part B, Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.compositesb.2011.08.050
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 510
    Subjects:
      – SubjectFull: Performance evaluation
        Type: general
      – SubjectFull: Reinforced concrete
        Type: general
      – SubjectFull: Strengthening mechanisms in solids
        Type: general
      – SubjectFull: Carbon fiber-reinforced plastics
        Type: general
      – SubjectFull: Concrete slabs
        Type: general
      – SubjectFull: Nonlinear theories
        Type: general
      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Microfabrication
        Type: general
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
      – SubjectFull: Mechanical loads
        Type: general
    Titles:
      – TitleFull: Performance of reinforced concrete slabs strengthened with different types and configurations of CFRP
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            NameFull: Al-Rousan, R.
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            NameFull: Issa, M.
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            NameFull: Shabila, H.
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              Text: Mar2012
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              Y: 2012
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