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    Concrete Cover Separation in FRP-Plated RC Beams: Mitigation Using FRP U-Jackets

    Source: Journal of Composites for Construction:;2017:;Volume ( 021 ):;issue: 002
    Author:
    B. Fu
    ,
    J. G. Teng
    ,
    J. F. Chen
    ,
    G. M. Chen
    ,
    Y. C. Guo
    DOI: 10.1061/(ASCE)CC.1943-5614.0000721
    Publisher: American Society of Civil Engineers
    Abstract: Concrete cover separation is a common failure mode of RC beams strengthened with a fiber-reinforced polymer (FRP) plate externally bonded to the tension face (FRP-plated RC beams). This failure mode initiates at the critical plate end and then propagates at the level of steel tension reinforcement in the direction of increasing moment. Plate-end anchorage by FRP U-jackets has been specified in some design guidelines as a mitigation measure to delay or suppress concrete cover separation, although its effectiveness is far from clear. This mitigation method is more attractive than other options because the same strengthening material is used and the installation procedure is simple. This paper presents the first systematic experimental study on the use of FRP U-jackets for mitigating plate-end concrete cover separation failure, with particular attention to the effect of inclination angle between the U-jacket and the beam axis. A total of 10 full-scale FRP-plated RC beams were tested. The test results show that both the load-carrying capacity and the ductility of an FRP-plated RC beam can be significantly enhanced by FRP U-jacketing at the critical plate end. Inclined U-jacketing at 45° to the beam axis was found to be much more effective than vertical U-jacketing (i.e., at 90° to the beam axis) in mitigating plate-end cover separation failure.
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      Concrete Cover Separation in FRP-Plated RC Beams: Mitigation Using FRP U-Jackets

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    contributor authorB. Fu
    contributor authorJ. G. Teng
    contributor authorJ. F. Chen
    contributor authorG. M. Chen
    contributor authorY. C. Guo
    date accessioned2017-12-16T09:20:50Z
    date available2017-12-16T09:20:50Z
    date issued2017
    identifier other%28ASCE%29CC.1943-5614.0000721.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4241657
    description abstractConcrete cover separation is a common failure mode of RC beams strengthened with a fiber-reinforced polymer (FRP) plate externally bonded to the tension face (FRP-plated RC beams). This failure mode initiates at the critical plate end and then propagates at the level of steel tension reinforcement in the direction of increasing moment. Plate-end anchorage by FRP U-jackets has been specified in some design guidelines as a mitigation measure to delay or suppress concrete cover separation, although its effectiveness is far from clear. This mitigation method is more attractive than other options because the same strengthening material is used and the installation procedure is simple. This paper presents the first systematic experimental study on the use of FRP U-jackets for mitigating plate-end concrete cover separation failure, with particular attention to the effect of inclination angle between the U-jacket and the beam axis. A total of 10 full-scale FRP-plated RC beams were tested. The test results show that both the load-carrying capacity and the ductility of an FRP-plated RC beam can be significantly enhanced by FRP U-jacketing at the critical plate end. Inclined U-jacketing at 45° to the beam axis was found to be much more effective than vertical U-jacketing (i.e., at 90° to the beam axis) in mitigating plate-end cover separation failure.
    publisherAmerican Society of Civil Engineers
    titleConcrete Cover Separation in FRP-Plated RC Beams: Mitigation Using FRP U-Jackets
    typeJournal Paper
    journal volume21
    journal issue2
    journal titleJournal of Composites for Construction
    identifier doi10.1061/(ASCE)CC.1943-5614.0000721
    treeJournal of Composites for Construction:;2017:;Volume ( 021 ):;issue: 002
    contenttypeFulltext
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