Recovery-based error estimation in the dynamic analysis of offshore wind turbine monopile foundations

Bayat, Mehdi; Ghorashi, Seyed Shahram; Amani, J.; Andersen, Lars Vabbersgaard; Ibsen, Lars Bo; Rabczuk, Timon; Zhuang, Xiaoying; Talebi, Hossein

doi:10.1016/j.compgeo.2015.07.012

Cited by 2 publications

(1 citation statement)

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“…However, the total loading can be significantly less than the sum of the constituent loads. This is because the loads are not FEM was employed to solve the equations of motion for a two-phase medium by several researchers ( [12][13][14][15] and the the references therein). The time domain response of a jacket offshore tower with the soil resistance to the pile movement was modeled using p-y and t-z curves to account for soil nonlinearity and energy dissipation, presented by [16] by employing an finite element (FE) package to do the parameter study.…”

Section: Introductionmentioning

confidence: 99%

Axial Dynamic Stiffness of Tubular Piles in Viscoelastic Soil

2016

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Large offshore wind turbines are founded on jacket structures. In this study, an elastic full-space jacket structure foundation in an elastic and viscoelastic medium is investigated by using boundary integral equations. The jacket structure foundation is modeled as a hollow, long circular cylinder when the dynamic vertical excitation is applied. The smooth surface along the entire interface is considered. The Betti reciprocal theorem along with Somigliana's identity and Green's function are employed to drive the dynamic stiffness of jacket structures. Modes of the resonance and anti-resonance are presented in series of Bessel's function. Important responses, such as dynamic stiffness and phase angle, are compared for different values of the loss factor as the material damping, Young's modulus and Poisson's ratio in a viscoelastic soil. Results are verified with known results reported in the literature. It is observed that the dynamic stiffness fluctuates with the loss factor, and the turning point is independent of the loss factor while the turning point increases with load frequency. It is seen that the non-dimensional dynamic stiffness is dependent on Young's modulus and Poisson's ratio, whilst the phase angle is independent of the properties of the soil. It is shown that the non-dimensional dynamic stiffness changes linearly with high-frequency load. The conclusion from the results of this study is that the material properties of soil are significant parameters in the dynamic stiffness of jacket structures, and the presented approach can unfold the behavior of soil and give an approachable physical meaning for wave propagation.

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