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Ice Floe Impact Force on Vertical Sided Structures

by Jon R. Cox, CBI Industries Inc, Oak Brook, IL, USA,



Document Type: Proceeding Paper

Part of: Civil Engineering in the Arctic Offshore

Abstract:

A solution is described that does not assume a contact pressure-area curve or ice crushing strength. The impact force is related to Korzhavin's ice crushing equation by simple laws of physics. A time-history analysis is performed in which the instantaneous ice crushing strength, which is a function of the floe velocity and indentation width (i. e. strain rate), is used at each point in time. The impact force is then calculated as a function of time. This method has the added benefit of allowing the engineer to actually calculate a pressure-area curve which is consistent with the ice crushing strength. Furthermore, this method uses an industry-accepted ice crushing formula and readily available unconfined compressive ice strength data to solve the impact problem. Results of the time-history analysis are then compared with current solutions.

Subject Headings: Ice | Offshore structures | Impact forces | Stress analysis | Curvature | Compressive strength | Vertical loads

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