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RE: Factored Load Combinations with Cranes

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Thanks for this response.  I wonder if you could elaborate a little further.


IBC 2003 states that for occupancy loads of 100 psf or more you can’t reduce it.  It says for all other live loads it can be reduced.

ASCE 7-02 basically states the same thing except it infers it is for occupancy loads, which is not equipment.


PEMB designers use some different load combination factors for ASD design when combining crane with live and wind forces.  Are there any PEMB designers out there who can clarify what typical practice is for load factor design?





Rich Lewis

Lewis Engineering



-----Original Message-----
From: Scott, William N. [mailto:William.Scott(--nospam--at)]
Thursday, January 13, 2005 12:16 PM
To: 'seaint(--nospam--at)'
Subject: RE: Factored Load Combinations with Cranes


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)]
Sent: Thursday, January 13, 2005 8:52 AM
To: seaint(--nospam--at)
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