Arc-Surfaced Frictional Damper for Vibration Control in Container Crane

Table 6

Maximum displacement at the top of the structure.

Input motion	PGA (g)	Model	Without dampers (mm)	With dampers (mm)	Ratio
El Centro NS	0.44	Model DB	312	209.2	0.33
		Model SS		197.5	0.37
	0.62	Model DB	403.2	280.8	0.30
		Model SS		266.3	0.34
Taft EW	0.44	Model DB	238.5	107.2	0.55
		Model SS		92.78	0.61
	0.62	Model DB	308.1	137.8	0.55
		Model SS		118.7	0.61
Northridge EW	0.44	Model DB	256.6	161	0.37
		Model SS		122.1	0.52
	0.62	Model DB	331.7	218.6	0.34
		Model SS		171	0.48
Kobe NS	0.44	Model DB	205.6	154	0.25
		Model SS		128.8	0.37
	0.62	Model DB	265.7	226.7	0.15
		Model SS		172.7	0.35