Firstly, use the Mixed Method to find the critical value of q that causes the plastic collapse of the structure.

Secondly, if the structure, including its cross$-$section $($including height, thickness and breadth$)$ and the length $($both L$1$ and L$2),$ is scaled up by a factor of $1\mathrm{.}5,$ what is the corresponding plastic load q found using the Mixed Method now? Why?