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. as ASCE/SEI 7 and the International Building Code, the. Staggered laps were found to be weaker but fail in a less brittle manner when splices are staggered longitudinally as compared to equivalent laps, in which all bars are spliced at the same section whether or not bars were bundled. control and development of reinforcement and lap splices.) Reinforcement Anchorages and Splices. Half of these beams had shorter lap splices than that recommended by American Concrete Institute Building Code ACI 318-19 they failed by bond loss between. 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). Where reinforcing bars of two sizes are lap-spliced in tension, industry practice is to use the larger of the tension lap splice length for the smaller bar, or the tension. Where splices are necessary in reinforcement, the length of lap splices shall be in accordance with Table R611.5.4(1) and Figure R611.5.4 (1). The lap splice, as the name suggests, is created by overlapping two lengths of rebar, then wiring them together. Vertical and horizontal wall reinforcement required by Sections R611.6 and R611.7 shall be the longest lengths practical. This paper reports an investigation into the performance of lap splices of individual bars within a bundle of two or three. For lap splice design and construction, the ACI 318 Building Code requires the engineer to indicate locations and lengths of all lap splices on the structural drawings. International Residential Code 2012, R611.5.4.3: R611.5.4.3 Lap Splices. Keywords: bond strength brittleness bundles lap splicesĮuropean (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.
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