Given: The truss at right is subjected to a load of W = 200 lb at each of the five joints A, H, G, F and E. The roof slope is q = 30°.
Req'd: Determine the reaction force at support A, RA.
RA = lb (±1%)
Sol'n: Due to the symmetry of the system, RA= RE. Summing forces in the vertical direction gives:
2(RA) = 5(W), so: RA = 5/2(W) = 5/2(200 lb) RA = 500 lb
2(RA) = 5(W), so: RA = 5/2(W) = 5/2(200 lb)
RA = 500 lb