Situation $4$: Design the smallest square tied

column having not more than $4\%$ reinforcement

to carry an axial compression of $P_D=1800kN$

and $P_L=1400kN.$ Use $f_c^{\text{'}}=25$MPa and $f_y=$

$400$MPa.

What is the required dimension of the

column?

a$.425mm$

c$.500mm$

b$.450mm$

d$.475mm$

Using the dimension in the previous number,

how many $25mm$ diameter bars are

required?

a$.14$

c$.16$

b$.15$

d$.17$