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Jib crane impact factor

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I am evaluating an existing column to determine whether it can handle an upgraded jib crane. The owner whats to swap out the 1/2 ton crane with a 1 ton crane. Somewhere i saw that the crane live load is multiplied by an impact factor of 2, but i can't find the code reference. Any ideas?

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*Drew Morris, PE*| /Project Engineer/
BBFM Engineers, Inc. <http://www.bbfm.com/>
510 L Street, Suite 200 | Anchorage, Alaska 99501
Ph: (907)274-2236 | Fax: (907)274-2520 | Web: www.bbfm.com

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