$3\mathrm{.}1$ For each truss $(10$ points$),$ find the urea strength matrix $($local coordinate system$).$

$3\mathrm{.}2(10$ points$)$ Use the transformation matrix to find the element strength matrix $($full coordinate system$)$ obtained from each element.

Use $3\mathrm{.}3(10$ points$)$ superposition to obtain the entire rigid matrix caning.

sennem

$3\mathrm{.}4(10$ points$)$ Describe the boundary conditions at each node.

Use the $3\mathrm{.}5(10$ points$)$ boundary condition to interpret the problem and find the displacement of node $1.$