Seismic Performance and Ice-Induced Vibration Control of Offshore Platform Structures Based on the ISO-PFD-SMA Brace System

Table 6

Maximum test results of ice excitation of the platform.

Ice load	Structural type	Displacement of jacket (cm)	Acceleration of lower deck (cm/s^2)	Acceleration of top deck (cm/s^2)
Pushing	Uncontrolled	2.92	64.52	131.41
	ISO-SMA	1.89 (0.353)	13.70 (0.788)	26.20 (0.800)
	ISO-PFD-SMA	2.05 (0.298)	12.26 (0.810)	25.0 (0.810)
Bending	Uncontrolled	2.26	33.4	79.0
	ISO-SMA	2.18 (0.298)	10.9 (0.674)	18.9 (0.761)
	ISO-PFD-SMA	2.01 (0.11)	11.12 (0.667)	16.8 (0.787)

Note: the figure in brackets is the percentage of effectiveness of mitigating vibration which is equal to (uncontrolled structure − control structure)/uncontrolled structure).