It is an Euler problem, you must see that it is doubly embedded in addition to having a stiffener, be careful when calculating the Force P$,$ since you must find the K carefully, the Guide solution verify that it is correct and GIVE SOLUTION, some formulas guide. Columns.

$I={\displaystyle \underset{?}{\overset{?}{}}}(I_1+A_i{d}_i{)}^2$

$d_i=5-\stackrel{}{x}$

$d_i=15cm-1,2cm$

$d_i=13,8cm$

$I=4(6,33+4,48(13,8{)}^2)$

$I=3,438,00c{m}^4$

$A={\displaystyle \underset{?}{\overset{?}{}}}{A}_i=4A^{\text{'}}=4(4,48)=17,92c{m}^2$

ESTILO

$r=\sqrt[\phantom{2}]{\frac{1}{A}}$

$r=\sqrt[\phantom{2}]{\frac{3438}{17,92}}$

$r=13,85cm$

$C_c=\sqrt[\phantom{2}]{\frac{2{}^{2}E}{}}=\sqrt[\phantom{2}]{\frac{2{}^2(200*{10}^9)}{250P{o}_0}}=125$

$P=N\frac{El{r}^2}{L^2}$

$[$Determine the maxtmum load P $($