Capacity of column is decreased
Ductility of column reduces
Capacity of column is decreased but ductility of column increases
Both the capacity of column and ductility of column increase
Answer is Right!
Answer is Wrong!
The correct answer is: D. Both the capacity of column and ductility of column increase.
The circumferential action of the spiral in a spirally reinforced column provides confinement to the concrete core, which increases the column’s capacity to resist axial loads. The spiral also helps to prevent the concrete from cracking and spalling, which increases the column’s ductility.
Option A is incorrect because the circumferential action of the spiral actually increases the column’s capacity.
Option B is incorrect because the circumferential action of the spiral actually increases the column’s ductility.
Option C is incorrect because the circumferential action of the spiral both increases the column’s capacity and ductility.