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RE: Factored Load Combinations with Cranes

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You shouldn't use impact factors for the foundation design.
Gary

On 13 Jan 2005 at 9:16, Scott, William N. wrote:

> A crane is an equipment load. The load should not be reduced.
> 
> The loading should be based on crane capacity with impact factors.
> 
> 
> -----Original Message-----
> From: Rich Lewis [mailto:sea(--nospam--at)lewisengineering.com]
> Sent: Thursday, January 13, 2005 8:52 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Factored Load Combinations with Cranes
> 
> 
> Are there factored load combinations recommended for design in a one
> story building with a crane supported by the steel framing?   IBC
> Section 2.3.2 gives load combinations but doesn't distinguish crane
> hook loads like it does in allowable stress load combinations.  I
> interpret the crane load to be an 'L' load, separating it from the
> roof live load Lr.  This means in Equations 3, 4, 5 I can reduce the
> crane load to a factor of 0.5.  Am I looking at this correctly?
> 
> I ask this for foundation design load combinations.  
> 
> Rich Lewis
> Lewis Engineering
> 
> 
> 



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