Fatigue life analysis of spud can on a mobile self-elevating wellhead platform
Aiming at the structural form of spud can in the mobile self-elevating wellhead platform(WZ12-8E WHPA),its structural stress and fatigue life are calculated and predicted under eight different wave directions,considering the comprehensive environment of wave,ocean current,soil characteristics and corrosion.Firstly,the Longuet-Higgins model is used to convert random wave spectrum into regular wave spectrum,and the overall analysis is carried out by the software SACS,obtaining the shear force,bending moment and axial force transfer function at the pile leg section.Afterwards,the detailed local stress analysis of the spud can model is carried out with the aid of ABAQUS.Taking the calculated stress result as the cycle amplitude,the annual statistical number of waves as the cycle number,the damage is evaluated based on the Miner cumulative damage criterion,finally obtaining the fatigue life of the spud can.The differences of S-N curves in ABS and DNV specifications in evaluating the fatigue life of spud can are compared.
万方数据
维普
