Q$2.$With respect to figure B shown below:

$5m$

Figure$-$B

A$)$ Determine the shape factor and the Fully Plastic Moment $($Mp$)$ for the shaded symmetrical hollow rectangular beam section shown below. Assume the yield stress gy $=355\frac{N}{m}{m}^2.$

B$)$ If two plates of width $250mm$ and thickness equal to $\text{'}t\text{'}mm$ is connected $($fabricated$)$ at top and bottom $($one plate on each side$)$ for the given section, then what is the improvement in the fully plastic moment$(Mp$ of the section.

C$)$ If this revised fabricated section is now rotated by $90$ degrees, what is its effect on the shape factor of the section?

Take the value the $\text{'}t\text{'}$ as equal to the last two digits of your student id and if the last two digits is equal to zero, then take $\text{'}t\text{'}=10mm$