Analysis of reinforced concrete beams strengthened by external unbonded bars

J. Cairns, S. F A Rafeeqi

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)


    The article outlines a novel strengthening technique for reinforced concrete beams using external unbonded reinforcement. The advantages of the method lie in speed and simplicity of installation. The article provides a general description of structural behaviour of beams strengthened using the technique, supported by a numerical model to represent the behaviour of strengthened beams. A set of seven laboratory tests on reinforced concrete beams strengthened using the technique are reported, results compared with those of two reference specimens, and the model validated using test data. It is shown that good efficiencies can be achieved when strengthening lightly reinforced beam sections, but that with more heavily reinforced sections only limited strength enhancements are attainable.

    Original languageEnglish
    Pages (from-to)141-153
    Number of pages13
    JournalMagazine of Concrete Research
    Issue number2
    Publication statusPublished - Apr 2002


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