Workshop $3$

The pin$-$jointed frame shown below is constructed from steel with an elastic constant, $E,$ of $200k\frac{N}{m}{m}^2.$ The frame members $ab,ac$ and $ad$ have cross$-$sectional areas of $120m{m}^2,240m{m}^2$ and $120m{m}^2$ respectively.

$($a$)$ Determine the forces in the elements

$($b$)$ Check your answer using LinPro.