Example - Analysis of Trusses using the Method of
Joints
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Use the method of joints to find the forces in truss members, BD and AE. Construct a FBD of the entire truss. The result is:
Where Ax and Ay are the pin reactions at support A and Ey is the vertical force exerted by the roller on the truss. Next determine the support reactions at A and E. Sum moments about point A taking counterclockwise as positive. Ey (2) - 1200 (2) - 800 (4) = 0 which gives Ey = 2800 N Sum forces in the x-direction which gives Ax = - 800 N Sum forces in the y-direction which gives Ay - 1200 + 2800 = 0, Ay = -1600 N Click here to continue with this example.
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