Base Isolation for Seismic Retrofitting of a Multiple Building Structure: Design, Construction, and Assessment

Table 1

Parameters of elastic design response spectra [1].

Limit State	IO	DL	LS	CP
Probability of exceedance	0.81	0.63	0.10	0.05
Return Period (years)	120	201	1898	2475
Peak ground acceleration	0.109	0.139	0.318	0.345
Amplification factor	2.346	2.350	2.470	2.489
Transition Period (s)	0.336	0.350	0.398	0.406