a$)$ Determine the balanced case, Nor, and two additional points of the $N-M$ interaction

curve for the column section given in the figure below. One of the $N-M$ pairs must be above

the balanced case, and the other one must be below the threshold value of the balanced case

$(20$ Points$).$

b$)$ Sketch the $N-M$ interaction curve roughly using found out points $(10$ Points$).$

Material Strength

C$30/5420$

fyd$-$fywd$-365$ MPa

fcd$-20$ MPa

$kl=0\mathrm{.}82$

$A_{51}=A_{53}=600m{m}^2$

$A_{S2}=400m{m}^2$