The flexural behaviour of ice from in situ cantilever beam tests

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ConferenceIce Forces on Structures. Proceedings Part 1 IAHR Symposium on Ice Problems: 07 August 1978, Lulea, Sweden
Pages197215; # of pages: 19
Subjectice; flexural strength; cantilever beams; elastic foundations; elastic analysis; sea ice tests; elastic theory of beam on elastic foundation
AbstractThe cantilever beam test has been used very extensively in both the field and laboratory to investigate the flexural strength and strain modulus of sea ice. Shortcomings in the test are generally recognized, hence these measurements are used only as index values. One problem with flexural tests is that some prior knowledge about the material properties is required before they can be analyzed. The first part of this paper considers the elastic theory of a beam on an elastic foundation. Various factors that affect the interpretation of cantilever beam tests are examined, i.e., beam geometry, elastic foundation effect, and nonhomogeneity of elastic modulus through beam thickness. The second part of the paper presents results from in situ cantilever beam tests in Isfjorden, Spitsbergen, conducted during full scale trials with the offshore supply vessel M.V. "Werdertor" by a German group of investigators under the management of the Hamburgische Schiffbau-Versuchsanstalt. Field tests were carried out on 0.4 m thick sea ice with beam lengths up to 12 m. Load and beam deflections at up to three points were measured versus time. From these measurements strength and modulus index values were determined and the behaviour of a long cantilever beam on a foundation was confirmed. Frankenstein's approach of relating strength and strain modulus to the brine volume of saline ice was found to be quite applicable.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number17463
NPARC number20375836
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Record identifier84e2fbd5-ffed-4eff-8431-9ff7fdb5e359
Record created2012-07-23
Record modified2016-05-09
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