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

Table 5

Displacement response and damping rate of the subframe top floor (mm).

Test cases	Earthquake	Direction	Input amplitude	3^rd subframe				2^nd subframe
				Aseismic	Combined isolation	Damping rate	Isolation layer	Aseismic	Combined isolation	Damping rate	Isolation layer
S1	Chi-Chi-2N	Y	0.056 g	0.84	0.3	64.29%	1.04	1.21	0.45	62.81%	0.87
S2	Chi-Chi-2F	Y	0.056 g	0.72	0.23	68.06%	0.86	1.04	0.4	61.54%	0.79
B1	Chi-Chi-2N	X	0.051 g	0.78	0.27	65.38%	1.09	1.14	0.43	62.28%	0.85
		Y	0.056 g	0.91	0.32	64.84%	1.17	1.29	0.52	59.69%	0.98
B2	Chi-Chi-2F	X	0.051 g	0.67	0.21	68.66%	0.83	1.01	0.35	65.35%	0.73
		Y	0.056 g	0.78	0.27	65.38%	1.01	1.08	0.41	62.04%	0.85
S3	Chi-Chi-2N	Y	0.153 g	2.12	0.68	67.92%	3.19	2.61	0.92	64.75%	2.73
S4	Chi-Chi-2F	Y	0.153 g	1.83	0.64	65.03%	2.71	2.38	0.78	67.23%	2.34
S5	Chi-Chi-3N	Y	0.153 g	2.55	0.88	65.49%	4.26	3.04	1.08	64.47%	3.81
B3	Chi-Chi-2N	X	0.140 g	1.98	0.64	67.68%	2.98	2.54	0.91	64.17%	2.56
		Y	0.153 g	2.33	0.82	64.81%	3.26	2.85	0.98	65.61%	2.82
B4	Chi-Chi-2F	X	0.139 g	1.76	0.54	69.32%	2.56	2.32	0.73	68.53%	2.27
		Y	0.153 g	2.01	0.67	66.67%	2.93	2.53	0.78	69.17%	2.51
B5	Chi-Chi-3N	X	0.113 g	2.31	0.76	67.10%	4.04	2.91	1.02	64.95%	3.64
		Y	0.153 g	2.68	0.91	66.04%	4.48	3.28	1.12	65.85%	3.94
S6	Chi-Chi-2N	Y	0.316 g	3.54	1.36	61.58%	6.78	4.11	1.52	63.02%	5.26
S7	Chi-Chi-2F	Y	0.316 g	3.09	1.04	66.34%	5.41	3.54	1.21	65.82%	4.47
S8	Chi-Chi-3N	Y	0.316 g	4.11	1.54	63.26%	8.24	4.56	1.64	64.04%	5.83
B6	Chi-Chi-2N	X	0.289 g	3.53	1.16	67.14%	6.57	3.82	1.46	61.78%	4.86
		Y	0.316 g	3.93	1.41	63.61%	6.98	4.66	1.68	63.95%	5.24
B7	Chi-Chi-2F	X	0.288 g	3.14	1.03	67.20%	5.07	3.64	1.24	65.93%	3.86
		Y	0.316 g	3.42	1.15	66.37%	5.42	4.13	1.27	69.25%	4.27
B8	Chi-Chi-3N	X	0.297 g	3.93	1.51	61.58%	7.86	4.63	1.76	61.99%	5.56
		Y	0.316 g	4.42	1.61	63.57%	8.42	5.12	1.91	62.70%	5.88