What is lapping zone in columns as per is code

[Saiprasad08]

What is the column lapping zone as per is codes

 

[amd007]

What is the column lapping zone as per is codes

As per IS Code 456-2000 overlapping length should not be less than 75mm. Lapping should be avoided in the tensile zone of construction members.

In case of column generally we take 24d – 40d where ‘d’ is dia of bar. It also depends on the grade of concrete being used for column.

Further to state that :

1. Lapping should be provided at the center of the column because bending moment at the mid point is zero so try to lap at the mid point.
2. The lapping of bars should be provided alternately. Lap should not be given at the same point because buckling may occur.
3. Lateral ties should be provided closely spaced in Lapping zone.
4. Due to maximum stress, we can’t lap at the column/beam/slab joint.
5. Lapping should not be given at L/4 distance from top and bottom of the slab.

Cheers......