UFC 3-220-01N
15 AUGUST 2005
Figure 12-5 Examples of Computations for Vertical and Rocking Motions
12-1.3.6
Coupled Modes of Vibration. In general, vertical and torsional vibrations
can occur independently without causing rocking or sliding motions of the foundation.
To accomplish these uncoupled vibrations, the line of action of the vertical force must
pass through the center of gravity of the mass and the resultant soil reaction, and the
12-9
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