Dynamic Response of a Combined Isolation Based Mega-Substructure under Bidirectional Near-Fault Ground Motions

Table 7

Main frame displacement response and damping rate (mm).

Test cases	Earthquake	Direction	Input amplitude	3^rd floor			2^nd floor			1^st floor
				Aseismic	Combined isolation	Damping rate	Aseismic	Combined isolation	Damping rate	Aseismic	Combined isolation	Damping rate
S1	Chi-Chi-2N	Y	0.056 g	2.21	1.38	37.56%	1.32	0.84	36.36%	0.88	0.51	42.05%
S2	Chi-Chi-2F	Y	0.056 g	1.9	1.22	35.79%	1.06	0.63	40.57%	0.71	0.43	39.44%
B1	Chi-Chi-2N	X	0.051 g	2.33	1.53	34.33%	1.22	0.77	36.89%	0.78	0.45	42.31%
		Y	0.056 g	2.43	1.62	33.33%	1.38	0.86	37.68%	0.83	0.46	44.58%
B2	Chi-Chi-2F	X	0.051 g	1.95	1.22	37.44%	1.02	0.61	40.2%	0.64	0.37	42.19%
		Y	0.056 g	1.97	1.24	37.06%	1.12	0.65	41.96%	0.68	0.41	39.71%
S3	Chi-Chi-2N	Y	0.153 g	4.86	3.11	36.01%	3.54	2.04	42.37%	2.37	1.37	42.19%
S4	Chi-Chi-2F	Y	0.153 g	4.31	2.67	38.05%	3.02	1.81	40.07%	1.96	1.18	39.8%
S5	Chi-Chi-3N	Y	0.153 g	6.62	4.12	37.76%	4.42	2.51	43.21%	2.94	1.74	40.82%
B3	Chi-Chi-2N	X	0.140 g	4.63	3.02	34.77%	3.28	1.97	39.94%	2.21	1.32	40.27%
		Y	0.153 g	5.22	3.47	33.52%	3.69	2.17	41.19%	2.49	1.53	38.55%
B4	Chi-Chi-2F	X	0.139 g	4.11	2.51	38.93%	2.81	1.76	37.37%	1.84	1.14	38.04%
		Y	0.153 g	4.61	2.98	35.36%	3.15	1.91	39.37%	2.13	1.31	38.5%
B5	Chi-Chi-3N	X	0.113 g	6.65	4.28	35.64%	3.87	2.29	40.83%	2.78	1.65	40.65%
		Y	0.153 g	6.87	4.46	35.08%	4.56	2.61	42.76%	3.08	1.91	37.99%
S6	Chi-Chi-2N	Y	0.316 g	8.83	6.02	31.82%	6.22	3.72	40.19%	3.86	2.44	36.79%
S7	Chi-Chi-2F	Y	0.316 g	7.56	5.61	25.79%	5.26	3.55	32.51%	3.21	2.28	28.97%
S8	Chi-Chi-3N	Y	0.316 g	11.46	7.63	33.42%	7.02	4.52	35.61%	4.42	2.78	37.10%
B6	Chi-Chi-2N	X	0.289 g	9.34	6.08	34.90%	6.42	4.36	32.09%	3.12	2.21	29.17%
		Y	0.316 g	8.42	5.08	39.67%	6.02	4.16	30.90%	3.02	2.01	33.44%
B7	Chi-Chi-2F	X	0.288 g	7.92	5.53	30.18%	5.54	3.81	31.23%	2.61	1.87	28.35%
		Y	0.316 g	7.17	4.61	35.70%	5.23	3.74	28.49%	2.48	1.72	30.65%
B8	Chi-Chi-3N	X	0.297 g	11.58	7.44	35.75%	7.12	4.66	34.55%	3.69	2.66	27.91%
		Y	0.316 g	13.02	7.84	39.78%	7.02	4.75	32.34%	3.78	2.45	35.19%