Glacial ice impacts: Part II: Damage assessment and ice-structure interactions in accidental limit states (ALS)
Floating glacial ice features of various sizes pose a substantial threat to the structural integrity of offshore structures in ice-prone regions. Relatively small ice feathers, e.g., bergy bits and growlers, are a major concern because they are more difficult to detect by marine radars and perform c...
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Online Access: | https://hdl.handle.net/11250/2723273 https://doi.org/10.1016/j.marstruc.2020.102889 |
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2723273 2023-05-15T15:15:09+02:00 Glacial ice impacts: Part II: Damage assessment and ice-structure interactions in accidental limit states (ALS) Yu, Zhaolong Lu, Wenjun van den Berg, Marnix Amdahl, Jørgen Løset, Sveinung 2021 application/pdf https://hdl.handle.net/11250/2723273 https://doi.org/10.1016/j.marstruc.2020.102889 eng eng Elsevier https://www.sciencedirect.com/science/article/pii/S0951833920301829 Notur/NorStore: NN9585K Norges forskningsråd: 223254 urn:issn:0951-8339 https://hdl.handle.net/11250/2723273 https://doi.org/10.1016/j.marstruc.2020.102889 cristin:1843889 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 75 Marine Structures Arktisk teknologi Arctic Technology VDP::Offshoreteknologi: 581 VDP::Offshore technology: 581 Peer reviewed Journal article 2021 ftntnutrondheimi https://doi.org/10.1016/j.marstruc.2020.102889 2021-01-20T23:34:39Z Floating glacial ice features of various sizes pose a substantial threat to the structural integrity of offshore structures in ice-prone regions. Relatively small ice feathers, e.g., bergy bits and growlers, are a major concern because they are more difficult to detect by marine radars and perform concurrent ice management operations, especially in extreme sea states. This two-part companion paper aims to assess potential loads of accidental ice actions that are exerted on an offshore semi-submersible platform and the consequences of these actions. Paper I investigates the probability distributions of glacial ice impact velocities and the associated impact heights under different sea states. Given the critical impact energy identified from Paper I, Paper II investigates ice crushing and structural damage during glacial ice impacts in accidental limit states (ALS) and ice-structure interactions. Three different approaches, i.e., the integrated approach, weakly coupled approach and fully coupled approach, are employed. The methods are based on different coupling strategies between ice and the structure and are used to identify the critical local ice sharpness for stiffened panels of the platform column, which causes maximum structural damage given an energy demand. The accuracy of the simulation results, calculation efficiency and scope of application using the three approaches are compared and discussed. With the identified critical sharpness of the ice model, numerical simulations are performed to impact various locations of the platform column. Apart from scenarios with head-on ice impacts, several oblique impact scenarios are simulated, where the glacial ice feature slides along the contact plane with different initial indentations of the panel. The results are discussed with respect to the resistance and energy absorption of the ice and structure and ice-structure interactions. publishedVersion © 2020 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license(http://creativecommons.org/licenses/by/4.0/) Article in Journal/Newspaper Arctic Arktis* NTNU Open Archive (Norwegian University of Science and Technology) Arctic Marine Structures 75 102889 |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
topic |
Arktisk teknologi Arctic Technology VDP::Offshoreteknologi: 581 VDP::Offshore technology: 581 |
spellingShingle |
Arktisk teknologi Arctic Technology VDP::Offshoreteknologi: 581 VDP::Offshore technology: 581 Yu, Zhaolong Lu, Wenjun van den Berg, Marnix Amdahl, Jørgen Løset, Sveinung Glacial ice impacts: Part II: Damage assessment and ice-structure interactions in accidental limit states (ALS) |
topic_facet |
Arktisk teknologi Arctic Technology VDP::Offshoreteknologi: 581 VDP::Offshore technology: 581 |
description |
Floating glacial ice features of various sizes pose a substantial threat to the structural integrity of offshore structures in ice-prone regions. Relatively small ice feathers, e.g., bergy bits and growlers, are a major concern because they are more difficult to detect by marine radars and perform concurrent ice management operations, especially in extreme sea states. This two-part companion paper aims to assess potential loads of accidental ice actions that are exerted on an offshore semi-submersible platform and the consequences of these actions. Paper I investigates the probability distributions of glacial ice impact velocities and the associated impact heights under different sea states. Given the critical impact energy identified from Paper I, Paper II investigates ice crushing and structural damage during glacial ice impacts in accidental limit states (ALS) and ice-structure interactions. Three different approaches, i.e., the integrated approach, weakly coupled approach and fully coupled approach, are employed. The methods are based on different coupling strategies between ice and the structure and are used to identify the critical local ice sharpness for stiffened panels of the platform column, which causes maximum structural damage given an energy demand. The accuracy of the simulation results, calculation efficiency and scope of application using the three approaches are compared and discussed. With the identified critical sharpness of the ice model, numerical simulations are performed to impact various locations of the platform column. Apart from scenarios with head-on ice impacts, several oblique impact scenarios are simulated, where the glacial ice feature slides along the contact plane with different initial indentations of the panel. The results are discussed with respect to the resistance and energy absorption of the ice and structure and ice-structure interactions. publishedVersion © 2020 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license(http://creativecommons.org/licenses/by/4.0/) |
format |
Article in Journal/Newspaper |
author |
Yu, Zhaolong Lu, Wenjun van den Berg, Marnix Amdahl, Jørgen Løset, Sveinung |
author_facet |
Yu, Zhaolong Lu, Wenjun van den Berg, Marnix Amdahl, Jørgen Løset, Sveinung |
author_sort |
Yu, Zhaolong |
title |
Glacial ice impacts: Part II: Damage assessment and ice-structure interactions in accidental limit states (ALS) |
title_short |
Glacial ice impacts: Part II: Damage assessment and ice-structure interactions in accidental limit states (ALS) |
title_full |
Glacial ice impacts: Part II: Damage assessment and ice-structure interactions in accidental limit states (ALS) |
title_fullStr |
Glacial ice impacts: Part II: Damage assessment and ice-structure interactions in accidental limit states (ALS) |
title_full_unstemmed |
Glacial ice impacts: Part II: Damage assessment and ice-structure interactions in accidental limit states (ALS) |
title_sort |
glacial ice impacts: part ii: damage assessment and ice-structure interactions in accidental limit states (als) |
publisher |
Elsevier |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2723273 https://doi.org/10.1016/j.marstruc.2020.102889 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arktis* |
genre_facet |
Arctic Arktis* |
op_source |
75 Marine Structures |
op_relation |
https://www.sciencedirect.com/science/article/pii/S0951833920301829 Notur/NorStore: NN9585K Norges forskningsråd: 223254 urn:issn:0951-8339 https://hdl.handle.net/11250/2723273 https://doi.org/10.1016/j.marstruc.2020.102889 cristin:1843889 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.marstruc.2020.102889 |
container_title |
Marine Structures |
container_volume |
75 |
container_start_page |
102889 |
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