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RE: Crane Impact Loads

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The impact load is considered to be a service level load.  It is increased
because of higher stresses caused by acceleration and deceleration of the

So "L" would be P*I

Then in your load combination, the final ultimate load would be:

1.6*L = 1.6*P*I

Jason Kilgore
Leigh & O'Kane, LLC
Kansas City, Missouri
From: Ken E. Paquette [mailto:KEP(--nospam--at)] 
Sent: Friday, October 01, 2004 9:17 AM
To: seaint(--nospam--at)
Subject: Crane Impact Loads

The Specifications and Codes in the LRFD and ASD manuals appear to treat
crane impact loads virtually the same.
In LRFD are the crane impact loads treated as live loads in the various
factored load combinations where the impact loads would be factored again as
required for live loads in the various load combinations or are they treated
as a already factored and included directly in the load combinations.
Kenneth Paquette P.E.
3275 Suntree Blvd
Melbourne, Florida

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