Author(s): C. R. Neill
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Abstract: Devices designed to measure total ice force during river break-up have been built into two bridge piers. Measurements over a four-year period have yielded unit pressures from moving ice-sheets in the range of 100 to 160 lb/in2 (7 to 11.3 kg/cm2), for ordinary to moderately severe conditions. Analyses have been carried out of the probable ultimate strengths of several old piers that have successfully withstood ice for many years. Estimated unit pressures for structural failure are in the range of 150 to 250 lb/in2 (10.5 to 17.5 kg/cm2). It is concluded that the ice pressure of 400 lb/in2 (28 kg/cm2) specified in Canadian codes may be unnecessarily conservative for bridges in inland rivers where the most severe conditions are associated with spring break-up. Recommendations are offered for the design of force-measuring devices.
Year: 1970