General
Equilibrium Problems (example continued)
The FBD of truss ABCDE is as follows: Note that the unknown
forces at the pin and roller supports have been identified. |
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Next, apply the equations
of equilibrium: ΣFx
= 0, ΣFy
= 0, ΣMconvenient
point = 0 ΣFx = 0
gives Ax +
800 = 0 ΣFy
= 0 gives Ay - 1200
+ Ey = 0 Pick the convenient point
to sum moments to be point A. Counterclockwise Σ MA= 0 gives
Ey (2)
- 1200 (2) - 800 (4) = 0 |
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The result is three equations
in the three unknown support reactions
Ax, Ay, and Ey.
Click here to continue
with another example. |
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