In colomn reinforcement when dia of bar is going to change,
than what should be the lap length of bars weather it should
be of heigher dia bar lap length or it should the accordance
with new dia bar. the grade of concrete is same.
Answer Posted / faisal chaudhry
Normally the lap length formula is mentioned by designer
and it varies from 40d-60d.
Normally in "columns" we have to calculate the lap splice
length corresponding to smaller of the two bars that are
splicing, whereas in piles (that are either skin friction
or combination of skin friction and end bearing) this will
be reversed and we will have to use the bigger dia bar to
calculate the lap splice lenght.
The logic is very simple if you understand the basic
concept of lap splice lenght. You have to consider whether
its the smaller dia bar transferring stresses to bigger dia
or vice versa. lap splice length is always corresponding to
the dia of the bar which is transferring the stresses.
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