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

Table 4

Natural period ratios and damping factors obtained from complex eigenvalue analysis.

Natural period ratio/damping factor	Full-scale building^1	Specimen^2
TSW/TFI	1.19	1.24
TRO/TFI	1.01	1.03
TSR/TFI	1.19	1.25
hSW	5.14%	6.57%
hRO	0.05%	0.35%
hSR	5.06%	6.30%

¹Corresponds to secant stiffness at the yielding point for each story of the main frame of the superstructure. ²Calculated from sizes of members and catalogue specifications (without the friction device, not considering resistance force of linear guides at the sway part).