The 'laps' in reinforcement bars are generally NOT recommended for bars larger than:
Choose the correct answer
12 mm
36 mm — IS 456 recommends mechanical couplers or welded splices for bars > 36 mm diameter
20 mm
50 mm
Correct Answer
B. 36 mm — IS 456 recommends mechanical couplers or welded splices for bars > 36 mm diameter
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IS 456 Cl. 26.2.5: lap splices should not be used for bars larger than 36 mm diameter. For larger bars: mechanical couplers (threaded sleeve) or welded splices (IS 2751 for welding rebars). Laps: not more than 50% of total steel should be lapped at one section. Lap length = development length × 1.3 (tension); staggered laps preferred. Reason: laps in large bars (> 36 mm) cause excessive congestion and concrete placing problems.
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