Dynamic response of an offshore structure interacting with an ice floe failing in crushing

Hendrikse, Hayo; Nord, Torodd Skjerve

doi:10.1016/j.marstruc.2019.01.012

Cited by 36 publications

(14 citation statements)

References 29 publications

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“…Although there are simplified approaches for calculating ice load available in design standards 14,15 , earthquake actions still bring difficulties when designing ice-structure dynamic interplays 16 . Kato et al 17 proposed a method using finite element modelling and the Monte Carlo simulation and offers a general procedure with which to evaluate the simultaneous ice loading in the design; Kouichi et al 18 simplified the structure and ice system to a three-particle system and investigated the effect of structural form on the internal force response of the interactions therein.…”

Section: Openmentioning

confidence: 99%

Seismic behaviour analysis of a wind turbine tower affected by sea ice based on a simplified model

Huang¹,

Zhai

et al. 2021

Sci Rep

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Ice-structure interaction threatens the safety of the offshore structure; however, dynamic seismic action even renders this process more sophisticated. This research constructed a simplified calculation model for the wind turbine tower, ice, and water under seismic loading, which could avoid solving the complex non-linear equations. Then, the seismic behaviour of the structure, i.e. wind turbine tower, in the presence and absence of influences of the sea ice was investigated, and we found the remarkable effect of sea ice upon the wind turbine tower when its mass is within a range; the wind turbine tower is found to have reduced capacity in energy dissipation, and thickness of tower walls or stiffening ribs is supposed to be enlarged for making the structure more ductile. Affected by the sea ice, the shear force and bending moment of the tower showed significant increases, and more attention needs to be paid to the tower bottom and action position of the sea ice. According to the dynamic similarity principle, finally paraffin was used to simulate sea ice, and shaking-table tests were performed for simulating dynamic ice-structure-water interactions. Results of shaking-table tests verified the rationality of our proposed simplified model.

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Section: Openmentioning

confidence: 99%

Seismic behaviour analysis of a wind turbine tower affected by sea ice based on a simplified model

Huang¹,

Zhai

et al. 2021

Sci Rep

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“…These approaches, however, have failed to predict the measured ice loads over a sufficiently wide range of drifting speeds. A phenomenological model developed by [104], and validated in [19,105], recognized the dependency of the contact area between ice and structure on the speed of loading. With the application of this approach, which was already applied in an integrated analysis of an offshore wind turbine [106], the modelling of the non-linear ice-structure interaction requires the distinction of a sufficient number of elements in the contact area between the ice and the structure, significantly enhancing the duration of the required load simulations.…”

Section: Hydrodynamic Interactionmentioning

confidence: 99%

“…Similarly, Ref. [19] developed a one-dimensional model to describe the ice-structure-interaction incorporating also the sea-ice dynamics regarding floe size, wind and current.…”

Section: Introductionmentioning

confidence: 99%

Decoupled Modelling Approaches for Environmental Interactions with Monopile-Based Offshore Wind Support Structures

2020

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To meet the political goals regarding renewable energy production, offshore wind keeps expanding to waters with larger depths and harsher conditions, while the turbine size continues to grow and ever-larger foundation structures are required. This development can only be successful if further cuts in the levelized cost of energy are established. Regarding the design of the foundation structures, a particular challenge in this respect relates to the reduction of the total computational time required for the design. For both practical and commercial reasons, the decoupled modelling of offshore wind support structures finds a common application, especially during the preliminary design stage. This modelling approach aims at capturing the relevant characteristics of the different environment-structure interactions, while reducing the complexity as much as possible. This paper presents a comprehensive review of the state-of-the-art modelling approaches of environmental interactions with offshore wind support structures. In this respect, the primary focus is on the monopile foundation, as this concept is expected to remain the prominent solution in the years to come. Current challenges in the field are identified, considering as well the engineering practice and the insights obtained from code comparison studies and experimental validations. It is concluded that the decoupled analysis provides valuable modelling perspectives, in particular for the preliminary design stage. In the further development of the different modelling strategies, however, the trade-off with computational costs should always be kept in mind.

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“…The slow-varying processes of ice forces are also influenced by uneven ice thickness, stochastic variation of ice strength, and delayed elastic and viscous properties of the ice, in addition to the intermittent occurrences of other failure processes; all of these may contribute to a non-white forcing onto the structure. In this study, a phenomenological ice-structure interaction model [19,33] is used to investigate the effect of variation in ice conditions on the identified modal parameters and their uncertainties. A Matlab implementation of the model, including a single degree-of-freedom structural representation in the modal domain, is available from Mendeley data [34].…”

Section: Modal Parameter Identification Using Simulated Data Of Dynamic Ice-structure Interactionsmentioning

confidence: 99%

Stochastic subspace identification of modal parameters during ice–structure interaction

Nord

Petersen

Hendrikse

2019

Phil. Trans. R. Soc. A.

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Identifying the modal parameters of structures located in ice-infested waters may be challenging due to the interaction between the ice and structure. In this study, both simulated data from a state-of-the-art ice–structure interaction model and measured data of ice–structure interaction were both used in conjunction with a covariance-driven stochastic subspace identification method to identify the modal parameters and their corresponding variances. The variances can be used to assign confidence to the identified eigenfrequencies, and effectively eliminate the eigenfrequencies with large variances. This enables a comparison between the identified eigenfrequencies for different ice conditions. Simulated data were used to assess the accuracy of the identified modal parameters during ice–structure interactions, and they were further used to guide the choice of parameters for the subspace identification when applied to measured data. The measured data consisted of 150 recordings of ice actions against the Norströmsgrund lighthouse in the Northern Baltic Sea. The results were sorted into groups defined by the observed ice conditions and governing ice failure mechanisms during the ice–structure interaction. The identified eigenfrequencies varied within each individual group and between the groups. Based on identified modal parameters, we suggested which eigenmodes play an active role in the interaction processes at the ice–structure interface and discussed the possible sources of errors. This article is part of the theme issue ‘Environmental loading of heritage structures’.

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Dynamic response of an offshore structure interacting with an ice floe failing in crushing

Cited by 36 publications

References 29 publications

Seismic behaviour analysis of a wind turbine tower affected by sea ice based on a simplified model

Seismic behaviour analysis of a wind turbine tower affected by sea ice based on a simplified model

Decoupled Modelling Approaches for Environmental Interactions with Monopile-Based Offshore Wind Support Structures

Stochastic subspace identification of modal parameters during ice–structure interaction

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