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    New Method of Strengthening Reinforced Concrete Square Columns by Circularizing and Wrapping with Fiber-Reinforced Polymer or Steel Straps

    Source: Journal of Composites for Construction:;2013:;Volume ( 017 ):;issue: 002
    Author:
    Muhammad N. S. Hadi
    ,
    Thong M. Pham
    ,
    Xu Lei
    DOI: 10.1061/(ASCE)CC.1943-5614.0000335
    Publisher: American Society of Civil Engineers
    Abstract: This study investigates three methods of strengthening existing reinforced square concrete columns under different loading conditions. Four groups of sixteen reinforced concrete square columns were made from normal-strength concrete. Reinforcement was kept at minimum ratio, simulating columns that need retrofitting. Columns of the first group were reference columns (Group N), while the corners of the second group columns (Group RF) were rounded and wrapped with three layers of carbon-fiber-reinforced polymers (CFRPs). The sides of the columns of the third group (Group CF) were bonded with four pieces of concrete with a segmental circular shape, thus changing the cross section of the column from a square to a circle before each column was wrapped with three layers of CFRP. The columns of the last group (fourth) were modified as the third group to result in a circular cross section, but were confined with steel straps. Results from the study showed that all confinement methods increased the capacity and ductility of columns. In particular, segmental circular concrete covers dramatically reduced the stress concentration at the corners and increased confinement efficacy. The interaction (
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      New Method of Strengthening Reinforced Concrete Square Columns by Circularizing and Wrapping with Fiber-Reinforced Polymer or Steel Straps

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    http://yetl.yabesh.ir/yetl1/handle/yetl/57473
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    contributor authorMuhammad N. S. Hadi
    contributor authorThong M. Pham
    contributor authorXu Lei
    date accessioned2017-05-08T21:36:39Z
    date available2017-05-08T21:36:39Z
    date copyrightApril 2013
    date issued2013
    identifier other%28asce%29cc%2E1943-5614%2E0000338.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/57473
    description abstractThis study investigates three methods of strengthening existing reinforced square concrete columns under different loading conditions. Four groups of sixteen reinforced concrete square columns were made from normal-strength concrete. Reinforcement was kept at minimum ratio, simulating columns that need retrofitting. Columns of the first group were reference columns (Group N), while the corners of the second group columns (Group RF) were rounded and wrapped with three layers of carbon-fiber-reinforced polymers (CFRPs). The sides of the columns of the third group (Group CF) were bonded with four pieces of concrete with a segmental circular shape, thus changing the cross section of the column from a square to a circle before each column was wrapped with three layers of CFRP. The columns of the last group (fourth) were modified as the third group to result in a circular cross section, but were confined with steel straps. Results from the study showed that all confinement methods increased the capacity and ductility of columns. In particular, segmental circular concrete covers dramatically reduced the stress concentration at the corners and increased confinement efficacy. The interaction (
    publisherAmerican Society of Civil Engineers
    titleNew Method of Strengthening Reinforced Concrete Square Columns by Circularizing and Wrapping with Fiber-Reinforced Polymer or Steel Straps
    typeJournal Paper
    journal volume17
    journal issue2
    journal titleJournal of Composites for Construction
    identifier doi10.1061/(ASCE)CC.1943-5614.0000335
    treeJournal of Composites for Construction:;2013:;Volume ( 017 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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