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    Flexural Behavior of Hollow-Core Slabs Strengthened with Prestressed Basalt FRP Grids

    Source: Journal of Composites for Construction:;2019:;Volume (023):;issue:003
    Author:
    Xing-Hua Li;Gang Wu;Sheng Wang;Xin-Hua Yu
    DOI: doi:10.1061/(ASCE)CC.1943-5614.0000939
    Publisher: American Society of Civil Engineers
    Abstract: Numerous studies have been conducted on strengthening techniques using prestressed fiber-reinforced polymer (FRP) laminates, bars, and tendons. However, to date, no technique has been developed for prestressed FRP grids, which are an attractive solution for strengthening slabs, walls, and tunnels. In this paper, a novel waveform anchor is proposed and verified by tensile tests to be capable of feasibly and effectively anchoring the basalt FRP (BFRP) grid. Five hollow-core slabs, including one control slab and four strengthened slabs, were tested to failure to investigate the flexural behavior of slabs strengthened with prestressed BFRP grids. The effect of the anchorage system and prestressing force on the flexural performance of the slabs was studied. The test results showed that the failure mode of the prestressed BFRP grid–strengthened slabs was rupture of the BFRP grids, and no end peeling was observed. At increasing prestressing force in the BFRP grid, the failure mode changed from sequential rupture to essentially simultaneous rupture of the longitudinal bars. Thus, the flexural capacity of the strengthened slabs increased with the prestressing level of the BFRP grids. Improved cracking behavior of the slab could be obtained by prestressing the BFRP grid, and the crack width remarkably decreased as the prestressing force in the BFRP grid increased. However, the ductility of the strengthened slabs decreased with increased prestressing force in the BFRP grid.
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      Flexural Behavior of Hollow-Core Slabs Strengthened with Prestressed Basalt FRP Grids

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    contributor authorXing-Hua Li;Gang Wu;Sheng Wang;Xin-Hua Yu
    date accessioned2019-06-08T07:25:54Z
    date available2019-06-08T07:25:54Z
    date issued2019
    identifier other%28ASCE%29CC.1943-5614.0000939.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4257330
    description abstractNumerous studies have been conducted on strengthening techniques using prestressed fiber-reinforced polymer (FRP) laminates, bars, and tendons. However, to date, no technique has been developed for prestressed FRP grids, which are an attractive solution for strengthening slabs, walls, and tunnels. In this paper, a novel waveform anchor is proposed and verified by tensile tests to be capable of feasibly and effectively anchoring the basalt FRP (BFRP) grid. Five hollow-core slabs, including one control slab and four strengthened slabs, were tested to failure to investigate the flexural behavior of slabs strengthened with prestressed BFRP grids. The effect of the anchorage system and prestressing force on the flexural performance of the slabs was studied. The test results showed that the failure mode of the prestressed BFRP grid–strengthened slabs was rupture of the BFRP grids, and no end peeling was observed. At increasing prestressing force in the BFRP grid, the failure mode changed from sequential rupture to essentially simultaneous rupture of the longitudinal bars. Thus, the flexural capacity of the strengthened slabs increased with the prestressing level of the BFRP grids. Improved cracking behavior of the slab could be obtained by prestressing the BFRP grid, and the crack width remarkably decreased as the prestressing force in the BFRP grid increased. However, the ductility of the strengthened slabs decreased with increased prestressing force in the BFRP grid.
    publisherAmerican Society of Civil Engineers
    titleFlexural Behavior of Hollow-Core Slabs Strengthened with Prestressed Basalt FRP Grids
    typeJournal Article
    journal volume23
    journal issue3
    journal titleJournal of Composites for Construction
    identifier doidoi:10.1061/(ASCE)CC.1943-5614.0000939
    page04019016
    treeJournal of Composites for Construction:;2019:;Volume (023):;issue:003
    contenttypeFulltext
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