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RE: IBC Load combinations

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As stated in paragraph 1605.3.2 Formula 16-18 allows allowable stress increases or load combination reductions where permitted by the material section of IBC or referenced code.  Formula 16-12 does not permit allowable stress increases. I believe this accounts for the difference you see in the equations.
David L. Williams, P.E.
Vice-Pres., Snyder Engineering, Inc.
409 Vandiver Drive, Bldg. 5, Ste 203
Columbia, MO  65202
-----Original Message-----
From: Jake Watson [mailto:jwatson(--nospam--at)]
Sent: Friday, January 25, 2002 3:08 PM
To: seaint(--nospam--at)
Subject: IBC Load combinations

For those of you using the IBC, I am hoping you can clarify a load combination.  Equations 16-12 (0.60D+0.7E) and 16-18 (0.90D+E/1.4) give dramatically different results.  This can't be intented.  Any guidance would be appreciated.
Jake Watson
Salt Lake City, UT