Seismic Performance and Ice-Induced Vibration Control of Offshore Platform Structures Based on the ISO-PFD-SMA Brace System
Table 4
Maximum test results of earthquake excitation of the platform.
Earthquake
Structural type
Displacement of jacket (cm)
Acceleration of lower deck (cm/s2)
Acceleration of top deck (cm/s2)
Tianjin
Uncontrolled
30.3
1150
1750
ISO-SMA
7.84 (0.741)
558 (0.515)
638 (0.635)
ISO-PFD-SMA
2.26 (0.925)
444 (0.614)
467.9 (0.733)
TAFT
Uncontrolled
10.2
747
914
ISO-SMA
4.6 (0.549)
377 (0.495)
411 (0.550)
ISO-PFD-SMA
2.0 (0.804)
504.2 (0.325)
516.6 (0.436)
El Centro
Uncontrolled
9.52
589
1066
ISO-SMA
5.68 (0.403)
392 (0.334)
468 (0.561)
ISO-PFD-SMA
4.67 (0.509)
398 (0.324)
470 (0.559)
Note: the figure in brackets is the percentage of effectiveness of mitigating vibration which is equal to (uncontrolled structure − control structure)/uncontrolled structure).
