Effect of axial compression on flexural strength of freshwater and saline ice

Anwar, Taha (2024) Effect of axial compression on flexural strength of freshwater and saline ice. Masters thesis, Memorial University of Newfoundland.

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Abstract

In the design of bridges, wind turbine towers, offshore structures and ice-class ships for operations in ice-prone regions, sloped structures may be employed to promote flexural failure of level ice to reduce loads on the structure. During such interactions, the ice sheet does not fail in pure bending since a component of the applied force at the sloped interface results in an axial load that induces a compressive stress in the ice. The net effect of this axial component is that the corresponding compressive stresses balance with flexure-induced tensile stresses in the outmost fibres of the ice. As a result, the apparent flexural strength of the ice is expected to increase with increasing axial compression, since larger bending forces would be required to generate sufficient tension to trigger fracture. In ice load prediction models for sloped structures, an in-plane compression (IPC) factor is applied to calculated loads to account for increased flexural strength which is empirically determined to be 1.5. While the method of superposition may be used to assess combined loading effects for elastic structures, assessing such effects in ice is more complex since the behaviour of ice is not purely elastic. The relationship between axial compression and the flexural strength of freshwater and saline ice is studied experimentally to assess how the flexural failure behaviour of the ice changes for different levels of in-plane compression factor. A series of experiments on freshwater ice have been conducted for compression levels at 75%, 135% and 185% of unconfined flexural strength for ram speeds of 0.1 mm/s, 1.0 mm/s and 10.0 mm/s. Compression levels tested for saline ice correspond to IPC of 35%, 70% and 125%. These results indicate that in-plane compression can significantly increase the apparent flexural strength of the ice, ranging anywhere from 50 to 300%. These results highlight the need for further work in this area to better understand this phenomenon and assess implications for design. This new testing approach provides a promising direction for further examination of these important effects, including extending this work to larger beam sizes and different temperature ranges.

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