Lap splices of bars in bundles

John Cairns

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    13 Citations (Scopus)
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    European (EC2) and ACI 318-08 design code rules for lap splices
    of reinforcing bars within a bundle differ markedly—the former
    permits the same or shorter lap-splice lengths with respect to
    splices of individual bars, while the latter requires longer laps. This
    paper reports an investigation into the performance of lap splices
    of individual bars within a bundle of two or three. The results show
    that the bond strength of individual bars is not reduced on account
    of their forming part of a bundle (contrary to the provisions of
    ACI 318-08). Staggered laps were found to be weaker but fail in
    a less brittle manner when splices are staggered longitudinally as
    compared to equivalent laps, where all bars are spliced at the same
    section whether or not bars were bundled. Therefore, the outcome
    raises the question of the validity of reductions permitted by both
    the ACI 318-08 and European (EC2) codes, where only a portion of
    the bars is lap-spliced at a section. It is recommended that further
    investigation of the influence of the proportion of bars lapped at a
    section on splice performance be undertaken.
    Original languageEnglish
    Article number110-S16
    Number of pages9
    JournalACI Structural Journal
    Issue number2
    Publication statusPublished - 1 Mar 2013


    • lap splices
    • bundled bars
    • bond


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