Answer / sagar tiwari

formula for lap length
dx50=mm for m20 grade

for example-12x50=600mm

where d is the diameter of bar.

Answer / sankardas banerjee

40 TIMES OF THE DIA OF REINFORCEMENT IS THUMB RULL.

Answer / chinnasamy.g

compersive member=45d
tensile member=50d
d=dia of bars

Answer / ankur shrivastav

According to IRC 21:2000, clause 304.6.2----

Development/Lap Length is depends upon various factor--
like-
1. Grade of Concrete
2. Grade of Steel
3. Bonding Zone

Lap Length will be- nx Dia
Value of n is as below-

M20 M25 M30 M35 M40 and above
Fe500 66 56 48 42 42

Fe415 55 46 40 35 35

Fe 240 65 60 55 50 50

These values belongs only for bonding zone-1*.

For Bonding zone 2- n=1.4 x value of "n" in bonding zone 1

* Bonding Zone 2- Bonding Zone 2 is a zone where bar has been bent less than 45 degree angle and more than 300 mm fresh concrete is casted below the bars.

All other locations are bonding zone 1

Answer / m. vijayshankar

In between 40 times to 50 times according to the structural
consultant advise.

Answer / dronachari

50d, compressive zone 24d,Tensile zone 40d

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