An analytical method for calculating the lateral response of offshore rigid monopiles in sand considering aerodynamic and hydrodynamic loads.

In this paper, a method is proposed to calculate the lateral response of offshore monopiles in sand under aerodynamic and hydrodynamic loads. The ultimate soil resistance is assumed to be linear with depth, and the subgrade reaction modulus is assumed to be nonlinear with relative density. The mechanical modelling is examined in the context of the soil‒pile interaction relationship, and the deformation mode of the soil‒pile system is determined. Considering the aerodynamic and hydrodynamic loads, the mechanical relationships of the soil‒pile system are established. The validation of the computational results with existing numerical simulations and centrifuge tests confirms the effectiveness of the methodology in this study. • A method to calculate the lateral response of offshore monopiles under aerodynamic and hydrodynamic loads is proposed. • The mechanical model is examined based on the soil‒pile interaction relationship, and the deformation mode is determined. • Considering the aerodynamic and hydrodynamic loads, the mechanical relationships of the soil‒pile system are established. • An iterative calculation method to determine the threshold depth of the limit condition of the soil is presented. [ABSTRACT FROM AUTHOR]