An Analytical Method for Jack-Up Riser's Fatigue Life Estimation

Fengde Wang, Wensheng Xiao, Qi Liu, Lei Wu, Zhanbin Meng
2018 Mathematical Problems in Engineering  
In order to determine whether a special sea area and its sea state are available for the jack-up riser with surface blowout preventers, an analytical method is presented to estimate the jack-up riser's wave loading fatigue life in this study. In addition, an approximate formula is derived to compute the random wave force spectrum of the small-scale structures. The results show that the response of jack-up riser is a narrow band random vibration. The infinite water depth dispersion relation
more » ... rsion relation between wavenumber and wave frequency can be used to calculate the wave force spectrum of small-scale structures. The riser's response mainly consists of the additional displacement response. The fatigue life obtained by the formula proposed by Steinberg is less than that of the Bendat method.
doi:10.1155/2018/5843525 fatcat:rlpn6jzyxveffdlgwyj4b5jtvq