Question 20.P.10: Construct an influence line for the force in the member CD o...
Construct an influence line for the force in the member CD of the truss shown in Fig. P.20.10 and calculate the force in the member produced by the loads positioned at C, D and E.

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The force in the member CD is given by –M_{F} /4 (using the method of sections).
The influence line for F_{CD} is shown in Fig. S.20.10.
Then, with the loads in the given positions
F_{CD} = – (20 × 0.625 + 10 × 1.25 + 5 × 0.625) = – 28.1 kN

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