a$)$ for a mechanism with plastic hinges at A$,$ C$,$ E and F calculate the required moment capacity, Mp

b$)$ calculate the bending moments at B and at D for the above mechanism

c$)$ draw the bending moment diagram for the above mechanism showing all significant values of moments.

d$)$ give reasons why the mechanism above is an upper bound solution

e$)$ generate a lower bound solutions for Mp and clearly state your reasons