a) Draw a free body diagram of the truss and obtain expressions for the external reaction forces
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Question:
a) Draw a free body diagram of the truss and obtain expressions for the external reaction forces at A and G as a function of P and a.
b) Identify all zero-force members.
c) Use the method of joints to find the internal forces in each truss member (indicating if it is compressive or tensile). Hint: the truss has a symmetric geometry and symmetric loading.
d) Take a look again at the bridge picture. Do you see anything different when comparing tensile vs. compressive members? Are all members the same size? Explain.
e) What would happen if you remove the two circled truss members from the bridge? Explain.
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