OUESTION:

Considering the following $7$ steps, write a Matlab program to solve the frame structure shown below:

$-$ Step $1$: Data preparation and input.

$-$ Step $2$: Computation of element matrices.

$-$ Step $3$: Assembly of elements' stiffness matrices and elements' force vectors in the global stiffness matrix and global force vector.

$-$ Step $4$: Imposition of boundary conditions such as prescribed displacements. This is usually carried out simultaneously with the assembly of the global matrix in Step $3.$

$-$ Step $5$: Solution of the global system of equations for the nodal unknowns.

$-$ Step $6$: Computation of secondary variables such as stresses and strains from displacements.

$-$ Step $7$: Print and$/$or plot desired results.