Sensitivity analysis of fixed marine structure responses to wave force parameters by application of New Wave theory

The sensitivity analysis is conducted on fix marine structure responses, including maximum displacement, base shear and overturning moment to the main wave force parameters of drag coefficient, inertial coefficient and wave height. For this purpose, two simple structures namely mono-pile and four-leg truss are considered. The kinematics of waves are extracted through the New Wave theory and applied in the Morrison equation to calculate time series of wave force. ANSYS APDL15 software is applied for dynamic analysis and structural responses are obtained. The sensitivity analysis shows that, in comparison to the drag coefficient and inertia, structural responses are more sensitive to wave height variations. The results also show that, despite the nonlinear relationships between structural responses and wave force parameters, the nonlinear deviation is less than 3% and can be neglected.