Q$3(30$ marks$)$

A tied short column of square crose section that follow the AC$1-315$ requirement $($figure $13)$ have reinforced with $8-30M$ longitudinal bars and $10M$ ties. Use a $40mm$ clear cover to the ties. The material properties are summarized below. Develop the column diagram.

Given:

$f_c^{\text{'}}=30$MPa

$f_y=400$MPa

$E_s=200000$MPa

$\frac{O}{{?}_c}=0\mathrm{.}65$

$\frac{O}{{?}_s}=0\mathrm{.}85$

$b=500mm$

$h=500mm$