This paper addresses a condition where a wide, vertical faced structure is subjected to dynamic actions posed by competent level ice. Loading conditions where the ice fails by continuous crushing are studied. It is widely accepted that the structure reacts reluctantly to very rapidly fluctuating forces. On the other hand, an external force caused by continuous ice crushing is often magnified within the structure. These two effects are considered by deriving an equivalent lateral force. The lateral force is obtained by using a magnification factor. This parameter can also be used as an indicator of the dynamic susceptibility of the structure.

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