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

Table 1

Measured frequencies and damping ratio of JZ20-2MUQ platform structure.

Mode number	1	2	3
Frequency (Hz)
Measured 1 [11]	0.90	1.05	1.15
Measured 2 [11]	0.85	1.12
Damping ratio [11] (%)	4.0~5.5