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

Table 6

Main frame acceleration response and damping rate (m/s²).

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	1.34	0.8	40.30%	0.68	0.37	45.59%	0.82	0.46	43.90%
S2	Chi-Chi-2F	Y	0.056 g	1.12	0.62	44.64%	0.59	0.31	47.46%	0.72	0.45	37.50%
B1	Chi-Chi-2N	X	0.051 g	1.25	0.72	42.40%	0.62	0.34	45.16%	0.76	0.41	46.05%
		Y	0.056 g	1.57	0.94	40.13%	0.76	0.41	46.05%	0.88	0.46	47.73%
B2	Chi-Chi-2F	X	0.051 g	1.13	0.64	43.36%	0.53	0.28	47.17%	0.69	0.35	49.28%
		Y	0.056 g	1.46	0.84	42.47%	0.65	0.33	49.23%	0.76	0.4	47.37%
S3	Chi-Chi-2N	Y	0.153 g	3.64	2.01	44.78%	1.68	0.97	42.26%	2.49	1.46	41.37%
S4	Chi-Chi-2F	Y	0.153 g	3.01	1.78	40.86%	1.42	0.82	42.25%	2.13	1.18	44.60%
S5	Chi-Chi-3N	Y	0.153 g	4.15	2.15	48.19%	2.23	1.28	42.60%	3.08	1.83	40.58%
B3	Chi-Chi-2N	X	0.140 g	3.51	1.95	44.44%	1.8	1.03	42.78%	2.29	1.29	43.67%
		Y	0.153 g	3.81	2.21	41.99%	2.01	1.11	44.78%	2.64	1.53	42.05%
B4	Chi-Chi-2F	X	0.139 g	3.08	1.81	41.23%	1.54	0.86	44.16%	2.08	1.17	43.75%
		Y	0.153 g	3.24	1.93	40.43%	1.79	0.98	45.25%	2.29	1.28	44.10%
B5	Chi-Chi-3N	X	0.113 g	4.04	2.16	46.53%	2.31	1.31	43.29%	2.76	1.62	41.30%
		Y	0.153 g	4.43	2.51	43.34%	2.61	1.49	42.91%	3.17	1.87	41.01%
S6	Chi-Chi-2N	Y	0.316 g	5.61	3.46	38.32%	4.08	2.51	38.48%	5.09	3.21	36.94%
S7	Chi-Chi-2F	Y	0.316 g	5.32	3.11	41.54%	3.84	2.36	38.54%	4.46	2.87	35.65%
S8	Chi-Chi-3N	Y	0.316 g	7.37	4.41	40.16%	4.82	2.98	38.17%	5.46	3.54	35.16%
B6	Chi-Chi-2N	X	0.289 g	5.42	3.31	38.93%	3.86	2.43	37.05%	4.57	2.93	35.89%
		Y	0.316 g	7.01	4.31	38.52%	4.83	2.91	39.75%	5.52	3.67	33.51%
B7	Chi-Chi-2F	X	0.288 g	5.06	3.01	40.51%	3.52	2.17	38.35%	4.27	2.63	38.41%
		Y	0.316 g	6.42	3.92	38.94%	4.21	2.64	37.29%	5.01	3.21	35.93%
B8	Chi-Chi-3N	X	0.297 g	7.24	4.51	37.71%	4.96	3.22	35.08%	5.56	3.57	35.79%
		Y	0.316 g	8.52	5.21	38.85%	5.93	3.64	38.62%	6.96	4.37	37.21%