![]() ![]() Since lap splices transfer load through the surrounding concrete, when the concrete is gone, the lap splice in effect has failed. In coastal regions, rebar corrosion can produce concrete delamination and spalling. In seismic applications, mechanical splices maintain structural integrity when bars are stressed beyond yield, allowing the predictable formation of plastic hinges.Ģ) No reliance on concrete for load transfer Therefore the performance of the system is assured throughout the strain-hardening region where plastic deformations occur. To use splices in tensile regions, they must be able to develop the full strength of the rebar and not create a weak point. Mechanical splices maintain load path continuity of the reinforcement, independent of the condition or existence of the concrete. Mechanical splices offer builders the following benefits: Today, a range of mechanical splices are available to ensure that a precise, reliable connection can be made quicker and easier. They are more reliable than lap splices because they do not depend on concrete for load transfer. Mechanical splices join rebar end-to-end, providing many of the advantages of a continuous piece of rebar. Mechanical splices are mechanical connections between two pieces of rebar that enable the bars to behave in a manner similar to continuous lengths of rebar. ![]() Continuing research, more demanding designs in concrete, new materials and the development of composite materials have forced designers to consider alternatives to lap splicing, which is mechanical splices. However, there has been a shift in recent years. Lap splicing, which requires the overlapping of two parallel bars, has long been accepted as an effective, economical splicing method. In either case, rebar installers end up with two or more pieces of steel that must be spliced together. The required length of a bar may be longer than the stock length of steel, or the bar may be too long to be delivered conveniently. In almost all reinforced-concrete structures, rebars must be spliced. Lapping of rebars has long been considered an effective, economical splicing method, but today’s more demanding concrete designs are forcing builders to consider alternatives. ![]()
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