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    New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps

    Access Status
    Fulltext not available
    Authors
    Hadi, M.
    Pham, Thong
    Lei, X.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Hadi, M. and Pham, T. and Lei, X. 2013. New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps. Journal of Composites for Construction. 17 (2): pp. 229-238.
    Source Title
    Journal of Composites for Construction
    DOI
    10.1061/(ASCE)CC.1943-5614.0000335
    ISSN
    1090-0268
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/12197
    Collection
    • Curtin Research Publications
    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 (P-M) diagrams of experimental results and theoretical analysis all confirmed high performance of groups RF and CF.

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