Abstract
Laboratory tests on floating freshwater ice covers with specially built pulsators are described. Preliminary tests showed that the creep deflections were very small and that the pulsator used did not cause a breakthrough on its own in the time frame considered. Therefore, a breakthrough method was used to determine the effect of the oscillatory load on the bearing capacity of an ice cover. After a prescribed time (or a number of accumulated cycles) both loading devices, the pulsator and its static control, were subjected to a constant downward deflection rate by means of screwjacks until breakthrough occurred. Two series of tests were conducted, one at an oscillating frequency of 21.5 Hz and the other at 15 Hz. Results of both series of tests showed that the oscillations substantially lowered the bearing capacity of the ice covers tested.
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