Effects of Soil-Structure Interaction on Torsionally Coupled Base Isolated Machine Foundation under Earthquake Load

Table 4

Peak deck acceleration and displacement obtained from the FE analysis of base-isolated machine foundation.

Case		Peak deck acceleration, ()		Peak deck displacement, (mm)
		Without SSI	With SSI	Without SSI	With SSI
Imperial Valley, array #5, 1979
Torsionally uncoupled		0.47	0.37	14.16	28.93
Torsionally coupled	er = 0.05	0.49	0.96	16.15	28.69
	er = 0.15	0.52	0.97	21.01	27.60
Northridge, 1994
Torsionally uncoupled		0.66	1.73	19.92	49.73
Torsionally coupled	er = 0.05	0.70	1.73	22.85	49.08
	er = 0.15	0.72	1.74	27.83	47.47
Kobe, 1995
Torsionally uncoupled		0.25	1.66	7.62	61.43
Torsionally coupled	er = 0.05	0.25	1.66	8.13	61.58
	er = 0.15	0.24	1.65	9.26	61.86