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Title:: Earthquake Response Analysis of In-service Offshore Wind Towers Considering Effects of Tide Level and Hydrodynamic Pressure

Author(s):: SONG Bo; LI Ji-ren; WANG Hai-long; LIN Yi-chong; School of Civil and Environmental Engineering, University of Science and Technology Beijing

Keywords:: earthquake response; offshore wind tower; tide level; hydrodynamic pressure; added mass method; intertidal zone

Abstract:: In order to assess the dynamic characteristics of the in-service wind tower structures in intertidal zone under earthquake action, taking a 1 000 MW offshore wind tower in intertidal zone as study object, the earthquake response of the wind tower was analyzed by considering tide level and hydrodynamic pressure. The finite element model of wind tower was established, and the dynamic analyses of structure in mean water depth condition and extreme high tide level condition were carried, and the natural vibration characteristics of wind tower effected by scouring effect were analyzed. The results show that the dynamic response of the structure caused by hydrodynamic pressure is not obvious. The changes of dynamic performance indicators are within 5%. The scour will cause the change of soil thickness and lead to the change of dynamic characteristics, which may affect additional vibration of wind towers.