Civil Engineering - RCC Structures Design - Discussion

Column bars transfer load to bottom of footing slab through compression action.

So the compression development length shall govern here which is normally 18xD and 21xD based on steel grade and concrete strength.

What do they mean by inner edge of column? Is it the Top of Column?

Please explain.

If we erect the steel for a column and footing, let's take 6 bars for the column. So we need to bend (90 °) these bars near the bottom and insert them into the footing. BUT BARS INSIDE THE FOOTING SHOULD BE MORE THAN 42 Times the diameter of the bar.

Let's consider our bar is 16mm, so we need to insert 42 *16= 672 mm into the footing, obviously, its counted from the bend or you can say the outer edge of the column.

And we have to do it with all 6 bars which we consider here.

Thanks. @Archana.

Yes, right @Archana.

It Normally taken 50D.

Let's take an Isolated footing with the column on its top. Now provide reinforcement in it and extend it into footing up to 48d from the outer edge of the column. Hope this gonna help you guys.

l am not understanding this, Please describe the question with the figure.

I am not understanding this. Can anyone explain me in brief?

It is Leg distance of column reinforcement (vertical) which is extend 48 diameter to the footing from the outer edge of the column. Like shape of column vertical L. It is distance bottom part of L.