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Lap Length of reinforcement bars for Tension and Compression member- Footing, Column, Beam, Slab etc.

Er. Parbhakar Dwivedi
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The lap length is the length two rebar pieces must overlap and be tied together to create a bond as if there is no break and the run is continuous and to safely transfer the load from one bar to another bar.

We consider average length of a rebar is 12 m but in construction we required less or more lengths as per drawing and element requirement for safe and easy to work.

As per recommendation, in beams we avoid lapping of top bars at supports and avoid lapping of bottom bars at centre of span.

For flexural tension we consider LD or 30 x dia whichever is greater as specified by structural designer

For direct tension we consider 2LD or 30 x dia whichever is greater as specified by structural designer

Lap Length in compression shall be equivalent to the development length computed but not less than 24d

Lap in compression member allowed in middle zone and stagger 50% of bars but due to some specific reason we can lap in end zone with lap length 1.25LD after consultation of structural designer.

LAP LENGTH

DESIGN MIX. M20. M25 M30 M35 M40 & Above
DIA LAP 57 x Dia 49 x Dia 46 x Dia 40 x Dia 36 x Dia
32 Dia 1830 1570 1480 1280 1160
28 Dia 1600 1380 1290 1120 1010
25 Dia 1430 1230 1150 1000 900
20 Dia 1140 980 920 800 720
16 Dia 920 790 740 640 580
12 Dia 690 590 560 480 440
10 Dia 570 490 460 400 360
8 Dia 460 400 370 320 290
7 Dia 400 350 330 280 260
6 Dia 350 300 280 240 220

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