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NLFEA sulfate-damage reinforced concrete beams strengthened with FRP composites

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Title: NLFEA sulfate-damage reinforced concrete beams strengthened with FRP composites
Authors: Al-Rousan, R. rzalrousan@just.edu.jo, Haddad, R.1
Source: Composite Structures. Feb2013, Vol. 96, p433-445. 13p.
Subjects: Fiber-reinforced plastics, Finite element method, Sulfates, Polymeric composites, Reinforced concrete, Concrete beams, Structural analysis (Engineering), Shear (Mechanics)
Abstract: Abstract: A nonlinear finite element analysis (NLFEA) model is proposed, validated then expanded to predict the contribution of fiber reinforced polymer (FRP) composites in regaining structural performance and controlling failure of shear-deficient and sulfate-damaged RC beams. The model was validated using experimental data, before expanded to consider the effect of FRP form (sheet against strip), and its fiber orientation (45° against 90°), and bond area (web against U-wrap) in addition to sulfate-damage level. The performance was evaluated using ultimate shear strength, stiffness, toughness, and crack-opening toughness. Furthermore, shear stress versus slip for the FRP composites, strain-depth distribution in the high shear region, and cracking modes at failure for repaired beams were generated and compared. The NLFEA results showed that repairing shear-deficient and sulfate damaged RC beams with various configurations of (carbon and glass) FRP strips and sheets helped enhancing their loading carrying capacity by (10–39)% and (4–32)%, respectively. External 90° FRP U-wrap sheet provided larger increase in ultimate shear capacity than that with 90° FRP web sheets. As expected, carbon and glass FRP web strips showed better structural performance when oriented at 45° rather at 90°. Except for that with U-wrap FRP sheet, repair techniques with glass fibers imparted better overall structural performance to repaired beams than that of the FRP composites with carbon fibers. [Copyright &y& Elsevier]
Copyright of Composite Structures 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: 83933069
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: NLFEA sulfate-damage reinforced concrete beams strengthened with FRP composites
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  Data: <searchLink fieldCode="DE" term="%22Fiber-reinforced+plastics%22">Fiber-reinforced plastics</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Sulfates%22">Sulfates</searchLink><br /><searchLink fieldCode="DE" term="%22Polymeric+composites%22">Polymeric composites</searchLink><br /><searchLink fieldCode="DE" term="%22Reinforced+concrete%22">Reinforced concrete</searchLink><br /><searchLink fieldCode="DE" term="%22Concrete+beams%22">Concrete beams</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+analysis+%28Engineering%29%22">Structural analysis (Engineering)</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+%28Mechanics%29%22">Shear (Mechanics)</searchLink>
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  Data: Abstract: A nonlinear finite element analysis (NLFEA) model is proposed, validated then expanded to predict the contribution of fiber reinforced polymer (FRP) composites in regaining structural performance and controlling failure of shear-deficient and sulfate-damaged RC beams. The model was validated using experimental data, before expanded to consider the effect of FRP form (sheet against strip), and its fiber orientation (45° against 90°), and bond area (web against U-wrap) in addition to sulfate-damage level. The performance was evaluated using ultimate shear strength, stiffness, toughness, and crack-opening toughness. Furthermore, shear stress versus slip for the FRP composites, strain-depth distribution in the high shear region, and cracking modes at failure for repaired beams were generated and compared. The NLFEA results showed that repairing shear-deficient and sulfate damaged RC beams with various configurations of (carbon and glass) FRP strips and sheets helped enhancing their loading carrying capacity by (10–39)% and (4–32)%, respectively. External 90° FRP U-wrap sheet provided larger increase in ultimate shear capacity than that with 90° FRP web sheets. As expected, carbon and glass FRP web strips showed better structural performance when oriented at 45° rather at 90°. Except for that with U-wrap FRP sheet, repair techniques with glass fibers imparted better overall structural performance to repaired beams than that of the FRP composites with carbon fibers. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Composite Structures 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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      – Type: doi
        Value: 10.1016/j.compstruct.2012.09.007
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      – Code: eng
        Text: English
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        PageCount: 13
        StartPage: 433
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      – SubjectFull: Fiber-reinforced plastics
        Type: general
      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Sulfates
        Type: general
      – SubjectFull: Polymeric composites
        Type: general
      – SubjectFull: Reinforced concrete
        Type: general
      – SubjectFull: Concrete beams
        Type: general
      – SubjectFull: Structural analysis (Engineering)
        Type: general
      – SubjectFull: Shear (Mechanics)
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      – TitleFull: NLFEA sulfate-damage reinforced concrete beams strengthened with FRP composites
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            NameFull: Al-Rousan, R.
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            NameFull: Haddad, R.
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              Text: Feb2013
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              Y: 2013
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