For the structure shown in the figure, use the force method to:

a$)$ Determine the force in the tie rod CB$.($b$)$ Draw the Shear and Moment diagrams of beams $AB$ and DE$.$ Take $I=100({10}^6)m{m}^4$ for the beams and $A=250m{m}^2$ for the tie rod $CB,E=200$GPa.