Base Isolation of Buildings with Curved Surface Sliders: Basic Design Criteria and Critical Issues

Table 2

Four-column frame: periods and participant masses (translation X, translation Y, and rotation Z in the vibration modes).

Mode no.	T(s)	Participant mass X	Participant mass Y	Participant mass RZ	Sum X	Sum Y	Sum RZ
1	3.259	0.001	0.999	0.335	0.001	0.999	0.335
2	3.259	0.999	0.001	0.389	1	1	0.724
3	2.104	0.000	0.000	0.276	1	1	1