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

Table 4

Subframe acceleration response and damping rate (m/s²).

Test cases	Earthquake	Direction	Input amplitude	Floor	3^rd subframe			2^nd subframe
					Aseismic	Combined isolation	Damping rate	Aseismic	Combined isolation	Damping rate
S1	Chi-Chi-2N	Y	0.056 g	3	1.18	0.45	61.86%	1.47	0.56	61.90%
				2	1.01	0.38	62.38%	1.16	0.49	57.76%
				1	0.69	0.32	53.62%	0.83	0.45	45.78%
S2	Chi-Chi-2F	Y	0.056 g	3	0.96	0.38	60.42%	1.31	0.51	61.07%
				2	0.82	0.34	58.54%	1.02	0.45	55.88%
				1	0.61	0.31	49.18%	0.67	0.40	40.30%
B1	Chi-Chi-2N	X	0.051 g	3	1.13	0.41	63.72%	1.42	0.48	66.20%
				2	1.02	0.37	63.73%	1.13	0.43	61.95%
				1	0.74	0.32	56.76%	0.86	0.38	55.81%
		Y	0.056 g	3	1.26	0.48	61.90%	1.59	0.58	63.52%
				2	1.05	0.45	57.14%	1.31	0.52	60.31%
				1	0.84	0.41	51.19%	0.94	0.47	50.00%
B2	Chi-Chi-2F	X	0.051 g	3	0.91	0.34	62.64%	1.27	0.43	66.14%
				2	0.84	0.31	63.10%	1.05	0.39	62.86%
				1	0.66	0.27	59.09%	0.69	0.36	47.83%
		Y	0.056 g	3	1.09	0.41	62.39%	1.40	0.48	65.71%
				2	0.91	0.36	60.44%	1.09	0.44	59.63%
				1	0.76	0.32	57.89%	0.78	0.38	51.28%
S3	Chi-Chi-2N	Y	0.153 g	3	2.62	1.02	61.07%	3.11	1.24	60.13%
				2	2.21	0.91	58.82%	2.64	1.08	59.09%
				1	1.34	0.71	47.01%	2.06	0.97	52.91%
S4	Chi-Chi-2F	Y	0.153 g	3	1.92	0.78	59.38%	2.76	1.03	62.68%
				2	1.60	0.63	60.63%	2.21	0.91	58.82%
				1	1.13	0.51	54.87%	1.46	0.74	49.32%
S5	Chi-Chi-3N	Y	0.153 g	3	3.21	1.28	60.12%	4.03	1.61	60.05%
				2	2.61	1.06	59.39%	3.57	1.51	57.70%
				1	1.73	0.91	47.40%	2.44	1.24	49.18%
B3	Chi-Chi-2N	X	0.140 g	3	2.41	0.87	63.90%	3.07	1.12	63.52%
				2	1.89	0.76	59.79%	2.71	1.04	61.62%
				1	1.24	0.57	54.03%	1.98	0.81	59.09%
		Y	0.153 g	3	2.86	1.06	62.94%	3.39	1.21	64.31%
				2	2.27	0.91	59.91%	2.77	1.11	59.93%
				1	1.53	0.72	52.94%	2.28	0.86	62.28%
B4	Chi-Chi-2F	X	0.139 g	3	1.88	0.72	61.70%	2.61	0.93	64.37%
				2	1.51	0.62	58.94%	2.13	0.81	61.97%
				1	1.04	0.43	58.65%	1.32	0.68	48.48%
		Y	0.153 g	3	2.21	0.80	63.80%	2.94	1.01	65.65%
				2	1.79	0.62	65.36%	2.38	0.86	63.87%
				1	1.36	0.49	63.97%	1.57	0.68	56.69%
B5	Chi-Chi-3N	X	0.113 g	3	3.02	1.12	62.91%	3.86	1.52	60.62%
				2	2.43	0.96	60.49%	3.21	1.42	55.76%
				1	1.58	0.64	59.49%	2.33	1.03	55.79%
		Y	0.153 g	3	3.44	1.30	62.21%	4.12	1.51	63.35%
				2	2.82	1.16	58.87%	3.74	1.42	62.03%
				1	1.79	0.94	47.49%	2.61	1.28	50.96%
S6	Chi-Chi-2N	Y	0.316 g	3	3.75	1.73	53.87%	4.72	2.01	57.42%
				2	2.51	1.56	37.85%	3.54	1.63	53.95%
				1	2.29	1.31	42.79%	2.71	1.45	46.49%
S7	Chi-Chi-2F	Y	0.316 g	3	3.25	1.52	53.23%	4.02	1.76	56.22%
				2	2.29	1.36	40.61%	2.98	1.52	48.99%
				1	2.08	1.22	41.35%	2.47	1.31	46.96%
S8	Chi-Chi-3N	Y	0.316 g	3	4.44	2.11	52.48%	5.74	2.38	58.54%
				2	3.39	1.86	45.13%	4.22	2.14	49.29%
				1	2.99	1.54	48.49%	3.37	1.63	51.63%
B6	Chi-Chi-2N	X	0.289 g	3	3.77	1.69	55.17%	4.51	1.93	57.21%
				2	2.64	1.45	45.08%	3.32	1.52	54.22%
				1	2.05	1.22	40.49%	2.74	1.34	51.09%
		Y	0.316 g	3	3.79	1.60	57.78%	5.78	2.49	56.92%
				2	2.43	1.41	41.98%	4.42	2.13	51.81%
				1	2.20	1.18	46.36%	3.39	1.88	44.54%
B7	Chi-Chi-2F	X	0.288 g	3	3.18	1.56	50.94%	3.81	1.61	57.74%
				2	2.05	1.31	36.10%	2.73	1.43	47.62%
				1	1.64	1.10	32.93%	2.31	1.24	46.32%
		Y	0.316 g	3	3.24	1.40	56.79%	5.12	2.16	57.81%
				2	2.47	1.27	48.58%	3.98	1.96	50.75%
				1	1.98	1.01	48.99%	2.84	1.62	42.96%
B8	Chi-Chi-3N	X	0.297 g	3	4.86	2.03	58.23%	5.48	2.21	59.67%
				2	3.71	1.74	53.10%	4.02	2.01	50.00%
				1	2.44	1.42	41.80%	3.32	1.62	51.20%
		Y	0.316 g	3	5.47	2.09	61.79%	6.87	2.79	59.39%
				2	3.82	1.81	52.62%	5.01	2.53	49.50%
				1	2.91	1.57	46.05%	3.78	2.04	46.03%