Effective Semiactive Base Isolation System under Multiple Earthquakes

Table 8

Peak response of structures under testing earthquakes.

Earthquake	Peak acceleration (cm/s^2)				Peak interstory drift (cm)				Peak base drift (cm)
	F-B	S-B-I	P-Off	P-On	F-B	S-B-I	P-Off	P-On	S-B-I	P-Off	P-On
Olympia (PGA = 0.28 g, 1949)	840	156	177	284	0.28	0.08	0.04	0.07	0.93	0.25	0.17
San Helena Montana (PGA = 0.146 g, 1935)	306	36	113	170	0.13	0.02	0.03	0.07	0.21	0.18	0.12
Northridge (PGA = 0.344 g, 1994)	1728	117	205	514	0.68	0.05	0.06	0.22	0.52	0.45	0.20
Taft (PGA = 0.156 g, 1952)	727	97	145	256	0.32	0.04	0.03	0.06	0.52	0.18	0.15
Average	900	102	160	306	0.35	0.05	0.04	0.11	0.54	0.27	0.16