Preprints
https://doi.org/10.5194/wes-2021-81
https://doi.org/10.5194/wes-2021-81

  03 Dec 2021

03 Dec 2021

Review status: this preprint is currently under review for the journal WES.

Seismic soil-structure interaction analysis of wind turbine support structures using augmented complex mode superposition response spectrum method

Masaru Kitahara and Takeshi Ishihara Masaru Kitahara and Takeshi Ishihara
  • Department of Civil Engineering, School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan

Abstract. In this study, the seismic soil-structure interaction (SSI) of wind turbine support structures is investigated using response spectrum method (RSM) based on the complex eigenmodes. Seismic loadings on wind turbine support structures are newly derived by complex mode superposition RSM. To improve the prediction accuracy of the shear force acting on footings, this method is augmented by introducing the upper limit of modal damping ratios of 10 %. In addition, the bending moment at the hub height due to the mass moment of inertia of rotor and nacelle assembly is considered as an additional loading. The proposed method is validated by comparison with time history analysis (THA) accounting for different types of foundations and different tower geometries. Seismic loadings acting on the towers and footings by the proposed method show favourable agreement with the mean results by THA of several input acceleration time histories, while the original complex mode superposition RSM strongly underestimates shear forces acting on footings.

Masaru Kitahara and Takeshi Ishihara

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-81', Anonymous Referee #1, 10 Jan 2022
    • AC1: 'Reply on RC1', Masaru Kitahara, 11 Jan 2022
  • RC2: 'Comment on wes-2021-81', Anonymous Referee #2, 11 Jan 2022
    • AC2: 'Reply on RC2', Masaru Kitahara, 12 Jan 2022

Masaru Kitahara and Takeshi Ishihara

Masaru Kitahara and Takeshi Ishihara

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Short summary
The seismic soil-structure interaction of wind turbine support structures is investigated. Wind turbine support structures are modeled by the sway-rocking model and its seismic loadings are analytically derived by complex response spectrum method. To improve the prediction accuracy of the shcar force on footings, an upper limit of modal damping ratios is proposed. The proposed method is demonstrated to be capable to accurately and efficiently estimate the seismic loadings on towers and footings.