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    Effect of Partial Unbonding on Prestressed Near-Surface-Mounted CFRP-Strengthened Concrete T-Beams

    Source: Journal of Composites for Construction:;2011:;Volume ( 015 ):;issue: 001
    Author:
    Han T. Choi
    ,
    Jeffrey S. West
    ,
    Khaled A. Soudki
    DOI: 10.1061/(ASCE)CC.1943-5614.0000149
    Publisher: American Society of Civil Engineers
    Abstract: The flexural behavior of RC T-beams strengthened with prestressed near-surface-mounted (NSM) carbon fiber-reinforced-polymer (CFRP) reinforcement was investigated. The specific objective was to study the effect of partial unbonding of the CFRP reinforcement on the beam flexural behavior to increase the deformability. A total of eight RC T-beams were tested under four-point monotonic loading. The main variables were the level of prestressing force in the CFRP bars and the unbonded length at the midspan of the beam. The test results showed that all of the prestressed strengthened beams effectively improved the ultimate load-carrying capacity and the serviceability performance compared to the unstrengthened beam. The partially bonded prestressed beams exhibited an enhancement of the deformability compared to the fully bonded beams while minimizing the reduction of the load-carrying capacity. Partial unbonding was more effective to improve the deformability at higher levels of prestressing force. The general behavior of the partially bonded beams was reasonably well predicted by an analytical model developed previously by the writers.
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      Effect of Partial Unbonding on Prestressed Near-Surface-Mounted CFRP-Strengthened Concrete T-Beams

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    http://yetl.yabesh.ir/yetl1/handle/yetl/57269
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    contributor authorHan T. Choi
    contributor authorJeffrey S. West
    contributor authorKhaled A. Soudki
    date accessioned2017-05-08T21:36:15Z
    date available2017-05-08T21:36:15Z
    date copyrightFebruary 2011
    date issued2011
    identifier other%28asce%29cc%2E1943-5614%2E0000152.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/57269
    description abstractThe flexural behavior of RC T-beams strengthened with prestressed near-surface-mounted (NSM) carbon fiber-reinforced-polymer (CFRP) reinforcement was investigated. The specific objective was to study the effect of partial unbonding of the CFRP reinforcement on the beam flexural behavior to increase the deformability. A total of eight RC T-beams were tested under four-point monotonic loading. The main variables were the level of prestressing force in the CFRP bars and the unbonded length at the midspan of the beam. The test results showed that all of the prestressed strengthened beams effectively improved the ultimate load-carrying capacity and the serviceability performance compared to the unstrengthened beam. The partially bonded prestressed beams exhibited an enhancement of the deformability compared to the fully bonded beams while minimizing the reduction of the load-carrying capacity. Partial unbonding was more effective to improve the deformability at higher levels of prestressing force. The general behavior of the partially bonded beams was reasonably well predicted by an analytical model developed previously by the writers.
    publisherAmerican Society of Civil Engineers
    titleEffect of Partial Unbonding on Prestressed Near-Surface-Mounted CFRP-Strengthened Concrete T-Beams
    typeJournal Paper
    journal volume15
    journal issue1
    journal titleJournal of Composites for Construction
    identifier doi10.1061/(ASCE)CC.1943-5614.0000149
    treeJournal of Composites for Construction:;2011:;Volume ( 015 ):;issue: 001
    contenttypeFulltext
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