80 R.K. Giles and T.J. Kennedy 0 2 4 6 8 10 12 14 −20 −15 −10 −5 0 5 10 15 20 Time (s) Displacement (mm) Table X Axis Y Axis Z Axis Fig. 10.6 Representative data characterized by a short free rocking period starting with a small amplitude 0 2 4 6 8 10 12 14 −20 −15 −10 −5 0 5 10 15 20 Time (s) Displacement (mm) Table X Axis Y Axis Z Axis Fig. 10.7 Representative data showing a very large displacement in the forced phase followed by an extended period of free rocking Fig. 10.8 Histogram of the calculated damping ratios during free rocking of the columns 0.005 0.01 0.015 0.02 0 5 10 15 Trials Damping Coefficient
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