Ice-induced vibrations of the Norströmsgrund lighthouse

Nord, Torodd Skjerve; Samardžija, Ilija; Hendrikse, Hayo; Bjerkås, Morten; Høyland, Knut V.; Li, Hongtao

doi:10.1016/j.coldregions.2018.08.005

Cited by 19 publications

(22 citation statements)

References 12 publications

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“…While slowing down, frequency lock-in suddenly developed and sustained for about ten cycles before the ice floe speed reduced to speeds at which the ice no longer failed in crushing. This type of observation is typical for the lighthouse where sustained vibration did not occur often and most events only lasted a few cycles [20].…”

Section: Full-scale Interaction At the Norströmsgrund Lighthousementioning

confidence: 83%

“…Whilst in laboratory conditions, sustained ice-induced vibrations often develop, but for the Norströmsgrund lighthouse, the vibrations commonly lasted only for a small number of cycles [20]. Most of the pack ice interacting with the lighthouse came to a rest during interaction, as shown in Fig.…”

Section: Effect Of Floe Size and Environmental Driving Forces On Ice-induced Vibrationsmentioning

confidence: 95%

“…Here the results are presented from a simulation of an event of full-scale interaction at the Norströmsgrund lighthouse recorded during the STRICE campaign on April 5 th , 2001, and described in [20] and in detail in [64].…”

Section: Full-scale Interaction At the Norströmsgrund Lighthousementioning

confidence: 99%

“…This is not possible with the presented model which only includes the effects of crushing in such detailed manner. The analysis performed by Nord et al [20] showed that, during the three years of the STRICE campaign, frequency lock-in developed 61 times, of which 98% of the cases at an ice drift speed between 0.02 and 0.06 m s -1 . To verify that the model can reproduce this general trend, we simulated the dynamic ice-structure interaction for ice drift speeds increasing from 0 m s -1 up to 0.15 m s -1 with 0.001 m s -2 predefined constant acceleration and with a mean brittle crushing load of 2, 4, and 6 MN, scaling the input parameters in Table 1 accordingly.…”

Section: Full-scale Interaction At the Norströmsgrund Lighthousementioning

confidence: 99%

“…The aim of this development was to obtain a model which captures the local failure and deformation behavior of the ice at the ice-structure interface and does not assume a predefined global failure length or the debated stressstrain-rate dependence. The global and local failure and deformation of ice during indentation have been studied by experiments [16][17][18] and by re-analysis of existing full-scale data [19,20]. The work has been executed as part of the Norwegian Centre for Research Based Innovation 'SAMCoT' which has operated from 2011 and will end in 2019 [21].…”

Section: Introductionmentioning

confidence: 99%

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

Hendrikse

Nord

2019

Marine Structures

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Interaction of sea or lake ice with vertically sided offshore structures may result in severe structural vibrations commonly referred to as ice-induced vibrations. With the surge in offshore wind developments in sub-arctic regions this problem has received increased attention over the last decade, whereas traditionally the topic has been mainly associated with lighthouses and structures for hydrocarbon extraction. It is important for the safe design of these offshore structures to have the ability to predict the interaction between ice and structure in an expected scenario. A model for simulation of the interaction between a drifting ice floe and a vertically sided offshore structure is presented. The nonlinear speed dependent ductile and brittle deformation and local crushing of ice are considered phenomenologically. A one-dimensional sea ice dynamics model is applied to incorporate the effects of floe size, wind and current. The structure is modelled by incorporating its modal properties obtained from a general-purpose finite element software package. Alternatively, the model can be coupled to inhouse design software for fully coupled simulations. Examples of application of the model to simulate dynamic ice-structure interaction are provided. Simulation results are validated with public data from forced vibration experiments, small-scale intermittent crushing and frequency lock-in, and full-scale interaction with the Norströmsgrund lighthouse. Effects of floe size and environmental driving forces on the development of iceinduced vibrations in full-scale are studied. It is shown that sustained frequency lock-in vibrations of the structure can only develop for very specific combinations of environmental driving forces and ice floe size. In all other cases, the ice floe slows down and comes to a stop, or accelerates to a drift speed which exceeds the range where frequency lock-in develops. This results in only a few cycles of vibration per interaction event, such as observed for the Norströmsgrund lighthouse in the Baltic Sea.

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Section: Full-scale Interaction At the Norströmsgrund Lighthousementioning

confidence: 83%

Section: Effect Of Floe Size and Environmental Driving Forces On Ice-induced Vibrationsmentioning

confidence: 95%

Section: Full-scale Interaction At the Norströmsgrund Lighthousementioning

confidence: 99%

Section: Full-scale Interaction At the Norströmsgrund Lighthousementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Hendrikse

Nord

2019

Marine Structures

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Statistical analysis of sub-zero temperature effects on fatigue strength of welded joints

Braun

2021

Weld World

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Ships and offshore structures in Arctic environments are exposed to severe environmental actions and sub-zero temperatures. Thus, the design of such structures has to account for the Arctic environment and must be cost-efficient at the same time. A vital part of the design process is to ensure that fatigue-induced failure does not occur in the lifetime of the structure. While effects of high temperatures on material behavior are well covered in international standards and guidelines, there is no comprehensive guidance for sub-zero temperature fatigue strength assessment. Additionally, stress-life (S–N) test data of welded joints at sub-zero temperatures is particularly scarce. Hence, this study presents an extensive review of recent test results of various weld details tested in the range of − 50 to 20 °C. This data could build the basis for future considerations of temperature effects in fatigue design guidelines and recommendations. For this purpose, the fatigue test results are submitted to a rigorous statistically assessment—including a summary of the limitations of current design guidelines with respect to sub-zero temperature effects.

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Experimental data from ice basin tests with vertically sided cylindrical structures

et al. 2022

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Ice-induced vibrations of the Norströmsgrund lighthouse

Cited by 19 publications

References 12 publications

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

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

Statistical analysis of sub-zero temperature effects on fatigue strength of welded joints

Experimental data from ice basin tests with vertically sided cylindrical structures

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