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Re: Jib crane impact factor

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I have two sources for you: ASCE-7; and the Canadian National Building Code. These are in partial agreement. Both specify 1.25 for cab or radio controlled cranes and 1.1 for pendent operated electric cranes. ASCE-7 specifies 1.0 for hand geared hand operated cranes; CNBC includes them with pendent operated cranes.

I have designed, checked out, or load rated several hundred cranes in my career. I would recommend that you be nothing but conservative with any crane rated for 10 ton or less as operators tend to overload these quite frequently and quite substantially.



----- Original Message ----- From: "Drew Morris" <dmorris(--nospam--at)>
To: <seaint-seaosc(--nospam--at)>
Sent: Wednesday, July 03, 2013 11:57 AM
Subject: [SEAINT-SEAOSC] Jib crane impact factor

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?

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

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