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    Axial Impact Resistance of FRP-Confined Concrete

    Source: Journal of Composites for Construction:;2017:;Volume ( 021 ):;issue: 002
    Author:
    Thong M. Pham
    ,
    Hong Hao
    DOI: 10.1061/(ASCE)CC.1943-5614.0000744
    Publisher: American Society of Civil Engineers
    Abstract: This study investigates the impact resistance of fiber-reinforced polymer (FRP) confined concrete. Concrete cylinders were wrapped with carbon FRP (CFRP) or glass FRP (GFRP) with a varied number of layers and wrapping schemes. The impact tests were conducted by using drop-weight apparatus at different impact velocities. Dynamic behavior of the specimens has been investigated. The experimental results have shown that the failure modes are very different than those from static tests. Identical specimens experienced different damage as the impact velocities changed. The dynamic rupture strain of FRP was found to be substantially lower compared with that under static loads. As a result, the FRP efficiency factors were 0.17 and 0.56 for CFRP and GFRP, respectively. Interestingly, although GFRP has lower tensile strength and elastic modulus, it showed much better performance against impact compared with CFRP in terms of both the strength and ductility. The higher rupture strain of GFRP compared with CFRP results in higher confinement efficiency of GFRP under impact loads. A confinement model is proposed to predict the confined concrete strength under impact.
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      Axial Impact Resistance of FRP-Confined Concrete

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    contributor authorThong M. Pham
    contributor authorHong Hao
    date accessioned2017-12-30T13:04:48Z
    date available2017-12-30T13:04:48Z
    date issued2017
    identifier other%28ASCE%29CC.1943-5614.0000744.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4245391
    description abstractThis study investigates the impact resistance of fiber-reinforced polymer (FRP) confined concrete. Concrete cylinders were wrapped with carbon FRP (CFRP) or glass FRP (GFRP) with a varied number of layers and wrapping schemes. The impact tests were conducted by using drop-weight apparatus at different impact velocities. Dynamic behavior of the specimens has been investigated. The experimental results have shown that the failure modes are very different than those from static tests. Identical specimens experienced different damage as the impact velocities changed. The dynamic rupture strain of FRP was found to be substantially lower compared with that under static loads. As a result, the FRP efficiency factors were 0.17 and 0.56 for CFRP and GFRP, respectively. Interestingly, although GFRP has lower tensile strength and elastic modulus, it showed much better performance against impact compared with CFRP in terms of both the strength and ductility. The higher rupture strain of GFRP compared with CFRP results in higher confinement efficiency of GFRP under impact loads. A confinement model is proposed to predict the confined concrete strength under impact.
    publisherAmerican Society of Civil Engineers
    titleAxial Impact Resistance of FRP-Confined Concrete
    typeJournal Paper
    journal volume21
    journal issue2
    journal titleJournal of Composites for Construction
    identifier doi10.1061/(ASCE)CC.1943-5614.0000744
    page04016088
    treeJournal of Composites for Construction:;2017:;Volume ( 021 ):;issue: 002
    contenttypeFulltext
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