Ice Forces on Rigid, Vertical, Cylindrical Structures
A small-scale experimental study was conducted to characterize the magnitude and nature of ice forces during continuous crushing of ice against a rigid, vertical, cylindrical structure. The diameter of the structure was varied from 50 to 500 mm, the relative velocity from 10 to 210 mm/s, and the ice...
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ftdtic:ADA151393 2023-05-15T16:37:15+02:00 Ice Forces on Rigid, Vertical, Cylindrical Structures Sodhi,D. S. Morris,C. E. COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH 1984-12 text/html http://www.dtic.mil/docs/citations/ADA151393 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA151393 en eng http://www.dtic.mil/docs/citations/ADA151393 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost Structural Engineering and Building Technology *ICE VELOCITY THICKNESS STRUCTURAL PROPERTIES LOADS(FORCES) STRUCTURES VERTICAL ORIENTATION CYLINDRICAL BODIES STRUCTURAL RESPONSE MODEL TESTS RIGIDITY CRUSHING LPN-CWIS-31723 Text 1984 ftdtic 2016-02-20T23:57:24Z A small-scale experimental study was conducted to characterize the magnitude and nature of ice forces during continuous crushing of ice against a rigid, vertical, cylindrical structure. The diameter of the structure was varied from 50 to 500 mm, the relative velocity from 10 to 210 mm/s, and the ice thickness from 50 to 80 mm. The ice tended to fail repetitively, with the frequency of failure termed the characteristic frequency. The characteristic frequency varied linearly with velocity and to a small extent with structure diameter. The size of the damage zone was 10 to 50% of the ice thickness, with an average value of 30%. The maximum and mean normalized ice forces were strongly dependent on the aspect ratio (structure diameter/ice thickness). The forces increased significantly with decreasing aspect ratio, but were constant for large aspect ratios. The maximum normalized forces appeared to be independent of strain rate. The effect of velocity on the normalized ice forces depended on structure diameter. The mean effective pressure or specific energy of ice crushing depended on both aspect ratio and ice-structure relative velocity. The energy required to crush the ice for the one failure cycle was obtained from the ice force records for each test, and was compared to the energy calculated from an idealized sawtooth shape for the force record, the maximum force, velocity and characteristic frequency data. Originator - supplied keywords included: Cold regions, Cold regions construction, Cylindrical test structures, Ice, Ice crushing, Ice forces, and Test facilities. Text Ice permafrost Defense Technical Information Center: DTIC Technical Reports database |
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Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Snow Ice and Permafrost Structural Engineering and Building Technology *ICE VELOCITY THICKNESS STRUCTURAL PROPERTIES LOADS(FORCES) STRUCTURES VERTICAL ORIENTATION CYLINDRICAL BODIES STRUCTURAL RESPONSE MODEL TESTS RIGIDITY CRUSHING LPN-CWIS-31723 |
spellingShingle |
Snow Ice and Permafrost Structural Engineering and Building Technology *ICE VELOCITY THICKNESS STRUCTURAL PROPERTIES LOADS(FORCES) STRUCTURES VERTICAL ORIENTATION CYLINDRICAL BODIES STRUCTURAL RESPONSE MODEL TESTS RIGIDITY CRUSHING LPN-CWIS-31723 Sodhi,D. S. Morris,C. E. Ice Forces on Rigid, Vertical, Cylindrical Structures |
topic_facet |
Snow Ice and Permafrost Structural Engineering and Building Technology *ICE VELOCITY THICKNESS STRUCTURAL PROPERTIES LOADS(FORCES) STRUCTURES VERTICAL ORIENTATION CYLINDRICAL BODIES STRUCTURAL RESPONSE MODEL TESTS RIGIDITY CRUSHING LPN-CWIS-31723 |
description |
A small-scale experimental study was conducted to characterize the magnitude and nature of ice forces during continuous crushing of ice against a rigid, vertical, cylindrical structure. The diameter of the structure was varied from 50 to 500 mm, the relative velocity from 10 to 210 mm/s, and the ice thickness from 50 to 80 mm. The ice tended to fail repetitively, with the frequency of failure termed the characteristic frequency. The characteristic frequency varied linearly with velocity and to a small extent with structure diameter. The size of the damage zone was 10 to 50% of the ice thickness, with an average value of 30%. The maximum and mean normalized ice forces were strongly dependent on the aspect ratio (structure diameter/ice thickness). The forces increased significantly with decreasing aspect ratio, but were constant for large aspect ratios. The maximum normalized forces appeared to be independent of strain rate. The effect of velocity on the normalized ice forces depended on structure diameter. The mean effective pressure or specific energy of ice crushing depended on both aspect ratio and ice-structure relative velocity. The energy required to crush the ice for the one failure cycle was obtained from the ice force records for each test, and was compared to the energy calculated from an idealized sawtooth shape for the force record, the maximum force, velocity and characteristic frequency data. Originator - supplied keywords included: Cold regions, Cold regions construction, Cylindrical test structures, Ice, Ice crushing, Ice forces, and Test facilities. |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH |
format |
Text |
author |
Sodhi,D. S. Morris,C. E. |
author_facet |
Sodhi,D. S. Morris,C. E. |
author_sort |
Sodhi,D. S. |
title |
Ice Forces on Rigid, Vertical, Cylindrical Structures |
title_short |
Ice Forces on Rigid, Vertical, Cylindrical Structures |
title_full |
Ice Forces on Rigid, Vertical, Cylindrical Structures |
title_fullStr |
Ice Forces on Rigid, Vertical, Cylindrical Structures |
title_full_unstemmed |
Ice Forces on Rigid, Vertical, Cylindrical Structures |
title_sort |
ice forces on rigid, vertical, cylindrical structures |
publishDate |
1984 |
url |
http://www.dtic.mil/docs/citations/ADA151393 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA151393 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA151393 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766027541147025408 |