Page 476 - Marine Structural Design
P. 476
452 Part IV Structural Reliabiliiy
25.5.1 Load Combination Factors
Since the failure mode under sagging condition is the most prominent one, the results under
sagging condition are demonstrated as below.
The parameter analysis of the load combination factors cps and cpw for the FPSO is at first
carried out.
Figure 25.1 FPSO Midsection
0.7
0.6
0.5
0.4
1 2 3 4 5 6 7 8 9 10
llvs ,days
Figure 25.2 Load Combination Factors vs llv
Figure 25.2 shows the effect of the mean arrival period (UvJ of SWBM on the combination
factors, where a total number of 10' wave cycles in 20 service years is selected and the
environmental seventy factors (EFS), is taken to 0.80. It can be seen that the load combination
factors are sensitive to the mean arrival period of SWBM.
