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Re: Jib crane impact factor

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Bob MacCrimmon's book is very good. It specifically addresses the building structures that support cranes. He put a lot of work into it plus it was circulated for review and comments at least three times before it went to publication. I know I made three or four pages of comments and suggestions, most of which were either incorporated or at least addressed. I also know that the same was true for other people as well. In the end, I thought it was a very good collaborative publication.



----- Original Message ----- From: "Gary L. Hodgson and Assoc." <design(--nospam--at)>
To: <seaint-seaosc(--nospam--at)>
Sent: Thursday, July 04, 2013 7:08 AM
Subject: Re: [SEAINT-SEAOSC] Jib crane impact factor

I can't add much to what has already been said, except that I have been designing cranes and runways since 1967 and I and others whom I know have never used Limit States Design (your LRFD). There is no real savings in it except in building structures. Daryl is right about crane abuse. I would also recommend a Canadian publication-"Crane Supporting Steel Structures Design Guide" authored by R A MacCrimmon. It was published by the Canadian Institute of Steel Construction (2nd edition) and was available free on-line and a hard copy for a fee. Bob MacCrimmon used LSD as that is code in Canada. The design guide recommended by Bill is excellent.
On 2013/07/04 12:31 AM, h.d.richardson(--nospam--at) wrote:

There is an association called Crane Manufacturers Association of America (CMAA), whose name I couldn't recall for my earlier posting that specifies impact factors based on lift rates and many other things. I don't have a recent edition of their publication but an earlier edition specifically forbade the use of design methods based on

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