Determine the structure stiffness matrix \(\mathbf{k}\) for each member of the two-member frame. Take \(E=200 \mathrm{GPa}, I=350\left(10^{6}\right) \mathrm{mm}^{4}\), \(A=20\left(10^{3}\right) \mathrm{mm}^{2}\) for each member. Supports (1) and (3) are pinned and joint (2) is fixed connected.

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12 kN/m 2 20 kN 4 2 8 3 m. -2 m 2 m 4 m