Examination of factors affecting total ice load using medium-scale field indentation test data

A series of ice indentation tests has been performed since the A inter of 1 996 at Lake Notoro in Hokkaido as part of the JOIA project (JOIA reports 19 96-99). The main factors affecting total ice load (F) on a structure were i nvestigated using data derived under systematic test conditions, using natu ral sea ice. The width (W) of the model structure, ice thickness (h), inden tation speed (V) and uni-axial compressive strength (sigma (c)) are the maj or factors influencing ice load on a structure with a vertical face. This p aper determines that indentation pressure (P-t) depends on (W/h), (V/h) and (h). It also describes the pressure distribution examined by the 2-dimensi onal panel sensor, which can measure pressures in 2112 points at once, depe nding on various indentation speeds.