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Fatigue performance of reinforced concrete beams strengthened with CFRP sheets

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Title: Fatigue performance of reinforced concrete beams strengthened with CFRP sheets
Authors: Al-Rousan, R.1 rzalrousan@just.edu.jo, Issa, M.2
Source: Construction & Building Materials. Aug2011, Vol. 25 Issue 8, p3520-3529. 10p.
Subjects: Concrete beam fatigue, Carbon fiber-reinforced plastics, Concrete testing, Dynamic testing of materials, Strains & stresses (Mechanics), Ductility, Finite element method, Physics experiments
Abstract: Abstract: The paper presents the results of an experimental and analytical study involving the static and accelerated fatigue testing performance of nine reinforced concrete beams externally strengthened with different number and configuration of CFRP sheets. The beams were tested for the stress ranges of 0.25f y–0.35f y, 0.45f y–0.65f y, 0.65f y–0.90f y, and 0.45f y–0.90f y. After validating a nonlinear finite element analysis (NLFEA) with experimental test results, NLFEA was extended to provide a better understanding of the effect of fatigue stress range, number of CFRP layers, and the CFRP contact area with concrete on the performance of the reinforced concrete (RC) beams. The stress ranges have a significant effect on the permanent deflection at mid-span especially for the stress range of 0.45f y–0.90f y. Cyclic fatigue loading produced a time-dependent redistribution of the stresses that lead to a sudden drop in concrete stresses and a mild increase in steel and CFRP sheet stresses as fatigue life was exhausted. In addition, the authors recommend fatigue design considerations for calculating the reduction in the stiffness and ultimate load capacity due to fatigue loading. [Copyright &y& Elsevier]
Copyright of Construction & Building Materials 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: 60380039
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Fatigue performance of reinforced concrete beams strengthened with CFRP sheets
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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>
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  Data: <searchLink fieldCode="JN" term="%22Construction+%26+Building+Materials%22">Construction & Building Materials</searchLink>. Aug2011, Vol. 25 Issue 8, p3520-3529. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Concrete+beam+fatigue%22">Concrete beam fatigue</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+fiber-reinforced+plastics%22">Carbon fiber-reinforced plastics</searchLink><br /><searchLink fieldCode="DE" term="%22Concrete+testing%22">Concrete testing</searchLink><br /><searchLink fieldCode="DE" term="%22Dynamic+testing+of+materials%22">Dynamic testing of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Ductility%22">Ductility</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Physics+experiments%22">Physics experiments</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Abstract: The paper presents the results of an experimental and analytical study involving the static and accelerated fatigue testing performance of nine reinforced concrete beams externally strengthened with different number and configuration of CFRP sheets. The beams were tested for the stress ranges of 0.25f y–0.35f y, 0.45f y–0.65f y, 0.65f y–0.90f y, and 0.45f y–0.90f y. After validating a nonlinear finite element analysis (NLFEA) with experimental test results, NLFEA was extended to provide a better understanding of the effect of fatigue stress range, number of CFRP layers, and the CFRP contact area with concrete on the performance of the reinforced concrete (RC) beams. The stress ranges have a significant effect on the permanent deflection at mid-span especially for the stress range of 0.45f y–0.90f y. Cyclic fatigue loading produced a time-dependent redistribution of the stresses that lead to a sudden drop in concrete stresses and a mild increase in steel and CFRP sheet stresses as fatigue life was exhausted. In addition, the authors recommend fatigue design considerations for calculating the reduction in the stiffness and ultimate load capacity due to fatigue loading. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Construction & Building Materials 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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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.conbuildmat.2011.03.045
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      – Code: eng
        Text: English
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        PageCount: 10
        StartPage: 3520
    Subjects:
      – SubjectFull: Concrete beam fatigue
        Type: general
      – SubjectFull: Carbon fiber-reinforced plastics
        Type: general
      – SubjectFull: Concrete testing
        Type: general
      – SubjectFull: Dynamic testing of materials
        Type: general
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
      – SubjectFull: Ductility
        Type: general
      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Physics experiments
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      – TitleFull: Fatigue performance of reinforced concrete beams strengthened with CFRP sheets
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            – D: 01
              M: 08
              Text: Aug2011
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              Y: 2011
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