Due to the inaccessibility of longer bars that need to extend, lap length requires when bars are placed short of their required length. Changing the bar diameter along the length requires a change in lap length. By using Lap, the terminating bar’s axial force can be transferred to the connecting bar in the same manner as it transfers in the junction.
Concrete in the surrounding area is invariably stressed. When splicing, use proper splicing techniques, avoid high flexural and shear zones in a column, and stagger the splice points at every individual bar to mitigate the effects of these stresses.
Types of Lapping Method
Slab Lap Length
Side face reinforcement should be provided along with the two faces of a beam if the depth of the web at the beam exceeds 750 mm. This reinforcement must not be less than 0.1 percent of the total web area, and it must be evenly distributed over the web, not exceeding 300 mm between faces, whichever is less.
Beams have a 60-diameter lap length. The outermost tension and compression bars of beams must reinforce in transverse directions. Such reinforcement requires T- and I-beams near the outer face of the flange.
Beam Lap Length
One-eighth of the slab’s thickness shall not exceed the diameter of the reinforcing bars. A slab must have a minimum of 0.15 percent mild steel reinforcement in either direction. When welded wire fabric or high-strength deformed bars are used, this value can reduce to 0.12 percent.
Column Lap Length
At least 12 mm in diameter must be the minimum for bars. Columns of rectangular and circular shapes should have at least six longitudinal bars. At least 300 millimeters must separate longitudinal bars along the column’s perimeter.
Published By
Arka Roy
www.constructioncost.co
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