Hi!!
Dummy column is a temporary structure constructed to build further floor in a building.
Instead of dowel bars, small column constructed at terrace. so that bars demolitioned later and steel bars are used to lap the bars.
Lapping is necessary to distribute the loads.
Column is a vertical member.
Column there is two types. Long column and short column.
Based on slenderness ratio. Columns are differentiated.
Column ties are used to avoid the shear stresses..