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RE: Jib crane impact factor

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I would HIGHLY recommend the AISC Design Guide 7 "INDUSTRIAL 

Chapter 13 has the information that you need in particular.

It's available on the AISC website in PDF form, for free if you're a 
member, and for a nominal cost if not.

And if you're not, shame on you. It's the one technical association that is 
 irresistibly affordable especially considering the discounts on 
publications and all the freebies.

I'm as cheap-a** as they come but even I cough up for renewal every year.


Bill P.

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of Drew Morris Sent: Wednesday, July 03, 2013 2:00 PM
To: seaint-seaosc(--nospam--at)
Subject: Re: [SEAINT-SEAOSC] Jib crane impact factor

Daryl, thank you for the information.  I saw the impact loads in ASCE 7, 
but wasn't sure where my crane fit in.  I have a question when using LRFD 
design with these factors.  Is the factored live load Pu =

crane impact load factor * crane capacity

or 1.6 * crane impact load factor * crane capacity?

I have been using the latter formula, but with an impact factor 0f 2.0.

On 7/3/2013 10:40 AM, h.d.richardson(--nospam--at) wrote:
> Drew,
> 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

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