Dynamic analyses of operating offshore wind turbines including soil-structure interaction

Zuo, Haoran; Bi, Kaiming; Hao, Hong

doi:10.1016/j.engstruct.2017.12.001

Cited by 137 publications

(38 citation statements)

References 36 publications

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“…In this study, the calculation methods of nonlinear soil spring given in API [16] and DNV [18] codes are adopted. e p-y springs denote the horizontal soil resistances and the t-z and Q-z spring was set in the vertical direction to simulate the soil-pile interaction [30]. Figure 5 shows a pile foundation model with a soil spring.…”

Section: Pile-soil Interactionmentioning

confidence: 99%

Fatigue Damage Evaluation of Pile‐Supported Bridges under Stochastic Ice Loads

Qiu

2020

Advances in Civil Engineering

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e Bohai Sea is the sea area with the worst ice condition in China, and the ice loads significantly threaten the safety of structures in the sea. e intense vibrations of the pile-supported bridge under stochastic ice loads will increase the fatigue damage of a bridge structure and reduce the fatigue life of a bridge structure. In the present study, a comprehensive analysis model is presented to study fatigue damage for pile-supported bridges under ice loads in Bohai Sea. On the basis of measured statistical data of ice parameters and stochastic ice loads spectrum of Bohai Sea, the time histories of the stochastic ice loads of Bohai Sea are simulated. Fatigue damage analysis is carried out in time domain utilizing the finite element method considering soil and bridge structure interaction. e effect of soil conditions and water depth on the cumulative fatigue damage of the pile-supported bridges is studied. Numerical results indicate that in comparison with stiff soil conditions, pile-supported bridges in soft oil conditions can increase the cumulative fatigue damage substantially; pile-supported bridges in deep water also can increase the cumulative fatigue damage obviously. e study presented the first danger position of cumulative damage of the pile cross section under stochastic ice loads. e findings of this study can be used to fatigue damage evaluation and bridge construction in the ice-covered sea area.

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Section: Pile-soil Interactionmentioning

confidence: 99%

Fatigue Damage Evaluation of Pile‐Supported Bridges under Stochastic Ice Loads

Qiu

2020

Advances in Civil Engineering

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“…To analytically define the fundamental frequency for the case modeled in this study, all the elastic stiffness components are considered in the calculation, including the conventional stiffness, which depends on the material behavior; the geometric stiffness, which depends on the normal force acting on the structure; and the soil parcel, which accounts for the soil-structure interaction. It is important to note that the soil-structure interaction cannot be ignored, particularly in the case of a monopile foundation, because it may significantly influence the dynamic behavior of the structure [6].…”

Section: Introductionmentioning

confidence: 99%

Using Dynamic Analysis to Adjust the Rheological Model of Three Parameters to the Eurocode Creep Criteria

Wahrhaftig¹

2020

Dynamical Systems Theory

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A dynamic analysis of vibration for considering a three-parameter rheological model to fit the same results as predicted for creep by the Eurocode (EN 1992) criteria is performed based on the adjustment of its parameters. The use of a rheological model of three parameters as a valid alternative for real problems brings a huge facility for mathematical implementation and manipulation due the simplicity of the solution. For adjustment of the elastics and the viscous parameters, a numerical simulation to calculate the fundamental frequency of an actual reinforcement concrete pole is carried out in comparison with the standard Eurocode criteria. In this determination, the geometry variation, a concentrated force present at the free end of the structural element, and the self-weight of the structure are considered. The physical nonlinearity of the concrete due to the cracks is also considered by reducing of the flexural stiffness, and its viscoelastic behavior is included in the calculation through a temporal modulus of elasticity. In the analysis, the ground was modeled as a set of distributed springs along the foundation length. The frequency over time is then analytically calculated as the critical buckling load for different instants after the structure to be loaded.

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“…They used continuum damage mechanics to include the influence of micro cracking on the material. Zuo, Bi, and Hao (2018) noted that the soil-structure interaction could not be ignored, because, particularly in the case of a monopile foundation, there is an important interaction with and a significant influence on the dynamic behavior of the structure. Amini et al (2018) investigated this phenomenon associated with the soilstructure interaction.…”

Section: Introductionmentioning

confidence: 99%

Analytical determination of the vibration frequencies and buckling loads of slender reinforced concrete towers

Wahrhaftig

Silva

Brasil

2019

Lat. Am. j. solids struct.

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This study focused on improving the design of slender structures with reinforced concrete (RC) telecommunication towers as the main application. Analytical procedure based on Rayleigh's method to compute the first natural vibration frequency and the critical buckling load was development. All the nonlinearities present in the system were considered, in addition to the soil-structure interaction and the variation of the geometric properties along the length of the structure. The geometric nonlinearity and imperfections of the tower structure were computed as functions of the axial load using a geometric stiffness matrix. Further, the material nonlinearity was accounted for by reducing the flexural stiffness. As concrete structures exhibit viscoelasticity, creep was calculated using the Eurocode 2 model. The soilstructure interaction was modeled as a set of distributed springs. To validate the proposed method, the first frequency and critical buckling load were compared with those yielded by FEM simulations. The frequency results were in good agreement with those of the FEM simulations, indicating that the proposed method is sufficiently accurate for use in engineering design applications and easy to implement. On the other hand, the buckling load results obtained using the proposed method and FEM differed significantly, motivating further investigation.

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Dynamic analyses of operating offshore wind turbines including soil-structure interaction

Cited by 137 publications

References 36 publications

Fatigue Damage Evaluation of Pile‐Supported Bridges under Stochastic Ice Loads

Fatigue Damage Evaluation of Pile‐Supported Bridges under Stochastic Ice Loads

Using Dynamic Analysis to Adjust the Rheological Model of Three Parameters to the Eurocode Creep Criteria

Analytical determination of the vibration frequencies and buckling loads of slender reinforced concrete towers

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