Seismic Performance Evaluations of Mega-Sub Isolation System

Table 5

Comparison of story drift responses of the substructure in X direction between the experimental and numerical simulation results (unit: mm).

Cases		Aseismic			Isolated			LSC
		Floor			Floor			Floor
		1	2	3	1	2	3	1	2	3
Artificial; (0.125 g)	Experiment	2.85	2.89	3.83	2.20	2.72	3.49	2.64	2.82	3.72
	Simulation	2.95	3.30	3.91	3.26	3.26	3.60	2.48	2.87	3.86
	Error (%)	3.51	13.79	2.36	19.98	19.98	3.08	6.15	1.68	3.72
El centro; (0.125 g)	Experiment	2.59	3.12	3.55	1.86	1.86	2.69	1.52	2.01	2.73
	Simulation	2.29	2.86	3.60	1.50	1.50	2.23	1.76	0.34	2.34
	Error (%)	11.58	8.33	1.69	19.29	19.29	17.0	15.79	16.29	14.38
Taft; (0.125 g)	Experiment	2.74	1.79	1.01	1.05	1.05	1.58	2.49	1.13	1.89
	Simulation	2.77	1.99	1.02	0.95	0.95	1.20	2.08	1.12	1.96
	Error (%)	1.46	11.17	0.99	9.81	9.81	24.10	16.37	0.74	3.18
Artificial; (0.275 g)	Experiment	5.91	5.11	7.65	4.72	4.80	6.96	5.15	4.98	7.14
	Simulation	6.17	4.71	7.67	4.85	5.36	8.18	6.65	6.30	8.44
	Error (%)	4.58	7.84	0.26	2.73	11.73	17.57	29.08	26.48	18.24
El centro; (0.275 g)	Experiment	4.90	5.45	6.52	4.78	4.22	5.27	3.20	4.47	5.37
	Simulation	4.09	5.14	6.46	3.84	4.06	4.98	4.07	4.65	5.21
	Error (%)	16.53	5.51	0.92	19.81	3.70	5.50	27.04	4.04	2.97
Taft; (0.275 g)	Experiment	4.56	3.40	4.53	3.46	3.03	3.89	5.17	2.93	4.20
	Simulation	3.95	3.54	4.58	3.12	2.84	3.24	3.99	2.89	4.52
	Error (%)	13.45	4.19	1.33	9.93	6.21	16.65	22.89	1.41	7.68