Bond strength of lap splices in FRP and TRM confined concrete: Behavior and design

Dionysios Bournas, Thanasis Triantafillou

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Abstract

    The effectiveness of Fibre-Reinforced Polymer (FRP) and Textile-Reinforced Mortar (TRM) jackets was investigated experimentally and analytically in this study as a means of confining old-type reinforced concrete (RC) columns with limited capacity due to bond failure at lap splice regions. The local bond strength between lap spliced bars and concrete was measured experimentally along the lap splice region of six full-scale RC columns subjected to cyclic uniaxial flexure under constant axial load. The bond strength of two column specimens tested without retrofitting was found to be in good agreement with the predictions given by two existing bond models. These models were modified to account for the contribution of composite material jacketing to the bond resistance between lap spliced bars and concrete. The effectiveness of FRP and TRM jackets against splitting at lap splices was quantified as a function of jacket properties and geometry as well as in terms of the jacket effective strain, which was found to depend on the ratio of lap splice length to bar diameter. Consequently, simple equations for calculating the bond strength of lap splices in members confined with composite materials (FRP or TRM) are proposed.

    Original languageEnglish (US)
    Title of host publicationSeismic Evaluation and Rehabilitation of Structures
    PublisherKluwer Academic Publishers
    Pages203-219
    Number of pages17
    ISBN (Print)9783319004570
    DOIs
    StatePublished - Jan 1 2014

    Publication series

    NameGeotechnical, Geological and Earthquake Engineering
    Volume26
    ISSN (Print)1573-6059
    ISSN (Electronic)1872-4671

    Fingerprint

    mortar
    Bond strength (materials)
    Mortar
    Textiles
    polymer
    Concretes
    reinforced concrete
    Reinforced concrete
    Fibers
    Polymers
    Retrofitting
    Axial loads
    flexure
    Fiber reinforced materials
    geometry
    Geometry
    Composite materials
    prediction
    fibre
    textile

    ASJC Scopus subject areas

    • Geotechnical Engineering and Engineering Geology

    Cite this

    Bournas, D., & Triantafillou, T. (2014). Bond strength of lap splices in FRP and TRM confined concrete: Behavior and design. In Seismic Evaluation and Rehabilitation of Structures (pp. 203-219). (Geotechnical, Geological and Earthquake Engineering; Vol. 26). Kluwer Academic Publishers. https://doi.org/10.1007/978-3-319-00458-7_12

    Bond strength of lap splices in FRP and TRM confined concrete : Behavior and design. / Bournas, Dionysios; Triantafillou, Thanasis.

    Seismic Evaluation and Rehabilitation of Structures. Kluwer Academic Publishers, 2014. p. 203-219 (Geotechnical, Geological and Earthquake Engineering; Vol. 26).

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Bournas, D & Triantafillou, T 2014, Bond strength of lap splices in FRP and TRM confined concrete: Behavior and design. in Seismic Evaluation and Rehabilitation of Structures. Geotechnical, Geological and Earthquake Engineering, vol. 26, Kluwer Academic Publishers, pp. 203-219. https://doi.org/10.1007/978-3-319-00458-7_12
    Bournas D, Triantafillou T. Bond strength of lap splices in FRP and TRM confined concrete: Behavior and design. In Seismic Evaluation and Rehabilitation of Structures. Kluwer Academic Publishers. 2014. p. 203-219. (Geotechnical, Geological and Earthquake Engineering). https://doi.org/10.1007/978-3-319-00458-7_12
    Bournas, Dionysios ; Triantafillou, Thanasis. / Bond strength of lap splices in FRP and TRM confined concrete : Behavior and design. Seismic Evaluation and Rehabilitation of Structures. Kluwer Academic Publishers, 2014. pp. 203-219 (Geotechnical, Geological and Earthquake Engineering).
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