Effective Semiactive Base Isolation System under Multiple Earthquakes

Table 2

Peak response of structures under different 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
El Centro (PGA = 0.348 g, 1940)	1413	217	206	478	0.54	0.10	0.06	0.15	1.27	0.44	0.19
Loma Prieta (PGA = 0.278 g, 1989)	618	133	211	500	0.23	0.06	0.06	0.20	0.64	0.34	0.20
Northridge (PGA = 0.535 g, 1994)	678	176	186	237	0.30	0.09	0.04	0.07	1.09	0.29	0.18
Petrolia (PGA = 0.163 g, 1992)	324	146	136	164	0.13	0.07	0.04	0.05	0.90	0.26	0.15
Parkfield California (PGA = 0.35 g, 1966)	564	90	323	370	0.15	0.03	0.05	0.07	0.26	0.186	0.15
Taft (PGA = 0.18 g, 1952)	529	77	179	279	0.21	0.03	0.04	0.07	0.37	0.25	0.17
Average	688	140	207	338	0.26	0.06	0.05	0.10	0.76	0.29	0.17