Column is a vertical structural member that carry loads mainly in compression. It is assumed to be the most crucial structural member of a building because the safety of a building rest on the column strength. This is because failure of column would cause progressive collapse in buildings whereas such event would not occur when other members fail. Columns transfer vertical loads from a ceiling, floor or roof slab or from a beam, to a floor or foundation. They also carry bending moments about one or both of the cross-section axes.
Concrete Column Construction Process (video)
