Impedance of flexible suction caissons |
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| Authors: | Morten Liingaard Lars Andersen Lars Bo Ibsen |
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| Institution: | 1. DONG Energy, Kraftvaerksvej 53, Fredericia DK‐7000, Denmark;2. Department of Civil Engineering, Aalborg University, Aalborg DK‐9000, Denmark |
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| Abstract: | The dynamic response of offshore wind turbines is affected by the properties of the foundation and the subsoil. The aim of this paper is to evaluate the dynamic soil–structure interaction of suction caissons for offshore wind turbines. The investigations include evaluation of the vertical and coupled sliding–rocking vibrations, influence of the foundation geometry and examination on the properties of the surrounding soil. The soil is simplified as a homogenous linear viscoelastic material and the dynamic stiffness of the suction caisson is expressed in terms of dimensionless frequency‐dependent coefficients corresponding to different degrees of freedom. The dynamic stiffness coefficients for the skirted foundation are evaluated using a three‐dimensional coupled boundary element/finite element model. Comparisons with known analytical and numerical solutions indicate that the static and dynamic behaviours of the foundation are predicted accurately using the applied model. The analysis has been carried out for different combinations of the skirt length, Poisson's ratio of the subsoil and the ratio of the soil stiffness to the skirt stiffness. Copyright © 2007 John Wiley & Sons, Ltd. |
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| Keywords: | soil– structure interaction boundary element method dynamic stiffness impedance suction caisson skirted foundation |
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