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Re: IBC 1603.3 Live loads posted

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Say you posted the live load and somebody came and asked you what it meant.  Does it mean she/he could stack bags of whatever all over the floor and load it up to 100 psf?  How does taking a live load reduction enter into your reply?  Does it mean that she/he can not put a concentrated load on it if it exceeds 100 psf?  How many concentrated loads?  And how far apart?  How big does the sign really have to be if it is to be of some value? Or does it really just mean that the floor has been modeled to support an occupancy load twice that of 50 psf?  Do you reply that the posting is really just some bureaucratic nonsense perpetuated by engineers who like rules?
 
I still think live load determination is a good discussion topic.  How does one go from a variable grouping of concentrated loads to an equivalent uniform load?  Equipment loads on an industrial mezzanine, residential apartment framing over a concrete lid, stack rooms, etc. The reverse engineering of ASCE 7 does not seem appropriate.
 
 ----- Original Message -----
From: Jim Wilson
Sent: Tuesday, November 30, 2004 7:51 AM
Subject: IBC 1603.3 Live loads posted

IBC 160.3 states "Where the live loads for which each floor or portion thereof of a commercial or industrial building is or has been designed to exceed 50 psf, such design live loads shall be conspicuously posted by the owner in that part of each story in which they apply, using durable signs.  It shall be unlawful to remove or deface such notices."
 
Is this ever done?  What about any corridor or stair designed for 100psf -should they all be posted as such?  Maybe the Exit sign over the emergency exit stair should say Exit - 100psf.
 
And where are the load posting police?  "Unlawful"?  Can local authorities arrest a building owner for committing a crime if this isn't done? 
 
Wouldn't it be more important to post a low rating in an area where it would be expected to be high?  Such as an elevated platform designed for 40 psf with forktrucks driving around on it?  After all, bridge structures are only posted when they have limitations, not when they are up to code.
 
Just curious...
 
Jim Wilson, PE
Stroudsburg, PA


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