Survey on Major Worldwide Regulations on Seismic Base Isolation of Buildings

Table 17

Modal parameters of the hospital buildings under isolated/fixed-base conditions.

Los Angeles				New Mexico
Mode	Period (s)	Modal massratio (x)	Modalmass ratio (y)	Rotationalmass ratio	Period (s)	Modal massratio (x)	Modal massratio (y)	Rotationalmass ratio
1/-	2.690/-	0.993/-	0/-	0/-	2.530/-	0.998/-	0/-	0/-
2/-	2.670/-	0/-	0.999/-	0/-	2.510/-	0/-	0.999/-	0/-
3/-	2.400/-	0/-	0/-	0.990/-	2.290/-	0/-	0/-	0.999/-
4/1	0.300/0.513	0/0.820	0/0	0/0	0.350/0.706	0/0.836	0/0	0/0
5/2	0.288/0.470	0/0	0/0.820	0/0	0.330/0.697	0/0	0/0.830	0/0
6/3	0.265/0.449	0/0	0/0	0/0.820	0.310/0.617	0/0	0/0	0/0.833