... in estimating wellhead fatigue damage. flex joint time series load case riser angle riser joint riser analysis short crested wave wave direction upstream oil & gas standard deviation sea state crested wave main wave direction riser system fatigue damage fatigue analysis method total...

... riser was obtained. This matrix represents the effect of the complex assembly below the wellhead housing, including the non-linearities due to the soil and grouting. Since this matrix could not be input to the riser analysis program used (1984), it was transformed into a new system consisting of 2 beams...