You must have seen a RCC beam where the rings are not at uniform spacing.
In the middle span [ L/2 ] , the rings are at a normal spacing. But in the end spans , the spacing is reduced. This article shows how to calculate the no of rings in such a case. In a simple way. Read on ….
Let us also see, how is the strength in ribbed bar is exactly double from the strength in Mild steel ( Round ) bars.