|
For single-plane,
static systems, there are three equilibrium conditions that
must be met:
| 1) |
The
sum of the forces in the x-direction must equal zero
 |
| 2) |
The
sum of the forces in the y-direction must equal zero
 |
| 3) |
The
sum of the moments about any axis perpendicular to the
x-y plane must equal zero
| Moment
= |
(Force)
x (Shortest distance between the axis and the
line of direction that the force acts in)
|
|
| Determinacy: |
Structure
is statically determinant if there are three unknown reactions. |
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