The Study On Unified Empirical Equation Of Wave Forces For Geometrically Asymmetrical Pile-supported Structures

The environment of offshore wind power compared with onshore wind power is harsher and more complicated.Wave force has a huge impact on the support structure of installed offshore wind turbines.Installed offshore wind turbine requires a stronger support structure.Research on offshore wind turbine support structure has important engineering significance and economic value.This paper mainly focuses on the study of non-cylindrical monopile and asymmetric support structures of pile foundation.An experimental study on the non-cylindrical monopile structure is carried out.The concept of asymmetry coefficient is proposed.Unified empirical equation of wave forces for non-cylindrical monopile in regular waves is obtained.A series of numerical calculations of inline wave forces on four piles foundation and seven piles foundation support structures are carried out.It is found that for pile groups,the asymmetry has less influence on the dimensionless wave forces.It is found that the coefficient of pile group is related to the wave length of envelope rectangle and the regular wave length.By analyzing the relationship between wave parameters and wave forces of the structure,the concept of structural area ratio of structure is proposed to correct the influence of asymmetry on wave forces.Based on the original empirical equation,unified empirical equation of wave forces for both symmetrical and asymmetrical pile-supported structures in regular waves is obtained,which has a wider scope of application.