A new section of wall is getting started after grouting of the section below. This is because long horizontal bars can be easily placed in bond beams with minimal splicing.įigure 2. Masonry contractors have estimated that 80% of laps occur at vertical bars. However, lap splices increase the total volume of reinforcement in a wall and can impact the cost of the project. Lap splices allow the use of shorter vertical bars by transferring stresses from one reinforcing bar to another through the development of the splice. The use of lap splices improves the constructability of walls when using traditional, closed-end block ( Figure 1). The mason must lift the blocks over the bar that extends out of the previously grouted masonry, or over dowels extending out of the footing. In reinforced concrete masonry walls, long vertical bars are problematic for masons if traditional closed-end blocks are used. Reinforced masonry typically has vertical bars cast in grouted cells and may have horizontal bars cast in bond beams or joint reinforcement placed in mortar bed joints. A newer confinement-steel option is available that has the potential to significantly reduce the lap splice lengths, especially for larger diameter bars, through confinement of the structural reinforcement.
#Lap splice length code
Most designers who engineer reinforced masonry know that code provisions for lap splice lengths have been evolving over the past few code editions.
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