For the given column. Construct P$-$M interaction diagram.

Calculate $P$ and $M$ values for very large number

$c=550mm$

$c=398mm$

$c=200mm$

$c=65mm$

a$)$ Draw P$-$M interaction diagram

b$)$ What is balance moment and axial load

For $C60$ and $S420$

$f_{c_c}=40$Mpa,$f_y=365$Mpa

$k_1=0\mathrm{.}7,{}_c=0\mathrm{.}001825$

$Es=200,000$Mpa

The following is general view of a sample P$-$M interaction diagram with concrete and steel strains