Behavior of concrete columns confined by fiber composites

    Authors

    A. Mirmiran;R. Shahawy

    Comments

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    Abbreviated Journal Title

    J. Struct. Eng.-ASCE

    Keywords

    STRENGTH; DUCTILITY; Construction & Building Technology; Engineering, Civil

    Abstract

    External confinement of concrete by means of high-strength fiber composites can significantly enhance its strength and ductility as well as result in large energy absorption capacity. The confinement mechanism may include fiber-wrapping of existing columns as a retrofitting measure or encasement of concrete in a fiber reinforced plastic (FRP) tube for new construction. Proper design of such hybrid columns, however, requires an accurate estimate of the performance enhancement. Current design methods use simple extension of the models developed for conventional reinforced concrete columns. Results from a series of uniaxial compression tests on concrete-filled FRP tubes are compared with the available confinement models in the literature. The present study indicates that these models generally result in overestimating the strength and unsafe design. The study also shows a unique characteristic of confinement with fiber composites in that, unlike steel, FRP curtails the dilation tendency of concrete, as it reverses the direction of volumetric strains. This paper provides a framework for better understanding of the behavior of fiber-wrapped or FRP-encased concrete columns.

    Journal Title

    Journal of Structural Engineering-Asce

    Volume

    123

    Issue/Number

    5

    Publication Date

    1-1-1997

    Document Type

    Article

    Language

    English

    First Page

    583

    Last Page

    590

    WOS Identifier

    WOS:A1997WV71600007

    ISSN

    0733-9445

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