Effective Semiactive Base Isolation System under Multiple Earthquakes

Table 4

Peak response of structures under different earthquakes for set (A-1).

Earthquake	Peak acceleration (cm/s^2)				Peak interstory drift (cm)			Peak base drift (cm)
	Optimal case	r = 10^−0.5	rl-a	r = 10^−14	r = 10^−0.5	rl-a	r = 10^−14	r = 10^−0.5	rl-a	r = 10^−14	Optimal case
El Centro	208	209	272	392	0.061	0.067	0.108	0.438	0.361	0.368	0.338
Loma Prieta	213	213	312	400	0.062	0.067	0.103	0.335	0.293	0.290	0.282
Northridge	182	189	195	220	0.045	0.045	0.054	0.292	0.269	0.261	0.261
Petrolia	136	136	152	189	0.037	0.037	0.039	0.256	0.211	0.183	0.182
Parkfield California	321	323	328	348	0.047	0.053	0.055	0.182	0.175	0.169	0.169
Taft	179	179	201	227	0.040	0.051	0.057	0.255	0.227	0.202	0.202