Page 76 - Marine Structural Design

52 Part I Structural Design Principles

200,
-0 -
15
30 -45
90 -
-60 -75
I50
-120 - - 0- - 135
-150 - 4- -165
h - - Q- - 180
E
2
g loo
M
-
31
50

0
0.0 0.5 1 .o 1.5 2.0
Wave frequency, (radsec)

Figure 3.10 Comparison of Stress Frequency Response Functions at 13
Wave Directions (symmetric with respect to u=Oo or u=180°)
(Zhao, Bai & Shin, 2001)

Table 3.3 Comparison of Different Wave and Response Spectra (Zhao, Bai &
Shin, 2001)

Figure 3.11 demonstrates the stress spectral density functions at a& = 0. The bandwidth
parameter E of the response to JONSWAP and Bretschneider is shown in Table 3.3.