Revisiting Problem $3$ from Homework #$7,$ what is the maximum value for the first moment of area $(Q)$ of the pipe rack?

Units: $m{m}^3$

$C=20\mathrm{.}0mm$

$d=10\mathrm{.}0mm$

$B=10\mathrm{.}0mm$

$t=2\mathrm{.}0mm$

Each Pipe exerts force of $100N$ downward upon the rack,