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

Table 3

Maximum test results of earthquake excitation of the platform with SMA brace.

Earthquake	Structural type	Displacement of jacket; (cm)	Acceleration of lower deck; (cm/s^2)	Acceleration of top deck; (cm/s^2)
Tianjin	Original	30.3	1150	1750
	SMA	30.3; (0.043)	1050; (0.087)	1520; (0.131)
TAFT	Original	10.2	747	914
	SMA	9.76; (0.043)	667; (0.107)	829; (0.093)
El Centro	Uncontrolled	9.52	589	1066
	SMA	9.29; (0.024)	576; (0.022)	738; (0.308)

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