Abstract
AbstractOffshore wind turbines (OWT) are constructed in the seismically active areas to meet the growing energy demand. Monopile are commonly used as a foundation for OWT due to simple construction techniques and cost-effectiveness. OWT is subjected to various operational loads, such as wind, wave and seismic load during its design life. This study examines the dynamic response of the monopile supported OWT installed in layered sand deposits under the combined effect of operational and seismic loads. A two-dimensional (2D) finite element (FE) model is developed using OpenSees. Monopile and tower are modeled as linear Euler–Bernoulli beam, and soil domain is modeled as a quadrilateral plane strain element with solid–fluid fully coupled material. Pile–soil interaction is modeled using nonlinear p-y springs. Various earthquake records collected from online resources are scaled and applied at the base of the soil column along with various operational loads. The effect of intensity and depth of liquefaction on the dynamic response of the OWT structure are studied. The implication in the design of OWT in liquefied soil is suggested.KeywordsDynamic responseLiquefactionMonopileOffshore wind turbine
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