Figure 11

Computed saturation at each time for the vertical displacement. Computed saturation at the times (a) \(0.6\times 10^{3}\) (s), (b) \(1.2 \times 10^{3}\) (s), (c) \(4.8\times 10^{3}\) (s), and (d) \(4.8 \times 10^{4}\) (s) (almost steady state), respectively. The contour lines for \(u = 0.05n\) where n represent non-negative integers are depicted.