Information about lapping zones in columns and beams

[Manohara64]

Lapping zone in columns and beams

 

[MAHESWAR KABI]

Generally 50D we use in lapping in site . Some specially cases we 57D also used .

 

[DeepakTewatiya]

Lapping zone in columns and beams

Depend upon grade of concrete and grade of steel i.e fe-415 & fe-500

 

[Manohara64]

Depend upon grade of concrete and grade of steel i.e fe-415 & fe-500

I am asking at what distance l÷3 or l÷2

 

[DeepakTewatiya]

I am asking at what distance l÷3 or l÷2

View attachment 2616

I am asking at what distance l÷3 or l÷2

L/4

 

[amd007]

View attachment 2616
L/4

View attachment 2617

Columns :
Laps are advisable in areas where stresses are less which in the sketch is ideally Zone B, and preferably they should be STAGGERED.

Beams:
Top reinforcement in beam is lapped at mid-span as the beam does not experience any negative moment at midspan and so lapping is great in that region. In the case of bottom reinforcement it is lapped near the ends and again the same concept applies as there will be no positive moment at the ends of the beam.