Optimal Damper Slip Force for Vibration Control Structures Incorporating Friction Device with Sway-Rocking Motion Obtained Using Shaking Table Tests

Table 5

Results of free vibration tests.

Sway-rocking motion		Friction device condition	Natural period (s)	Damping factor (%)
Sway	Rocking
Fixed	Fixed	Fixed	0.52	0.26
Fixed	Fixed	No device	0.83	0.27
Fixed	Movable	No device	0.85	0.31
Not fixed^1	Fixed	No device	0.88	0.25
Not fixed^1	Movable	No device	0.91	0.31

¹Sway part did not move due to resistance force of linear guides.