Mechanism Analysis and Parameter Optimization of Mega-Sub-Isolation System

Table 3

Influence of the number and locations of isolated substructures on control performance under El Centro ground motion.

Programs	Maximum displacement of top main structure (m)	Maximum acceleration of top substructure (m/s^2)	Total input energy; ×10^6 (J)	Transfer energy; ×10^6 (J)	Ratio (%)
5	0.2485	4.6909	4.0509	2.6134	64.51
4	0.2583	—	4.6270	2.6066	56.33
3	0.2683	—	4.0293	1.7367	43.10
2	0.2792	—	4.0063	1.4347	35.81
4, 5	0.1905	4.7294	3.0926	2.4105	77.94
3, 5	0.1938	4.8097	3.1616	2.3381	73.95
2, 5	0.2299	5.3732	3.2344	2.0418	63.13
3, 4, 5	0.1565	3.4037	3.0567	2.7649	90.45
2, 4, 5	0.1812	3.3913	2.8621	2.2933	80.13
2, 3, 4, 5	0.1207	0.7740	2.3153	2.2736	98.20