Lecture $(3)$:

$-1G2,2,$

b$)$ Could you calculate $M-k($moment$-$curvature$)$ relation and rotational ductility ratio of the following given reinforced column section and materials. $($Neglect cracking case.$)$ C$40($for $a=5,6,7,8,9)$

$b=300mm$

$x_1=0,79$

$d=770+40=\frac{810}{(mm)}$

Neqlect Mcr $=?$