Question

Under the action of a concentric axial compressive load, a reinforced concrete short square column of size 300 mm is reinforced with 4 numbers of 25 mm diameter longitudinal bars of Fe415 steel. Concrete used is of grade M30. The ultimate axial load carrying capacity of the column is ____ kN.

• A. 1800

Answer 1

The correct option is A 1800
The ultimate load carrying capacity of a concentric axial compressive column will be

$P_u=0.45f_{ck}{A}_c+0.75f_y{A}_{sc}$

$=0.45\times 30\times ({300}^2-4\times \frac{\pi }{4}\times {25}^2)+0.75\times 415\times 4\times \frac{\pi }{4}\times {25}^2$

$\simeq 1800kN$