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RE: UBC 1630, Ev Question

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According to the ICBO seminar I attended last fall it will be corrected in the 2000 IBC. I don't recall seeing it in the draft, however.

> -----Original Message-----
> From: Tom.Hunt(--nospam--at)fluor.com [mailto:Tom.Hunt(--nospam--at)fluor.com]
> Sent: Wednesday, February 02, 2000 9:43 AM
> To: SEAINT(--nospam--at)seaint.org
> Subject: UBC 1630, Ev Question
> 
> 
> 
> 
> UBC Section 1630.1.1 Equation 30-1 requires E = pEh + Ev 
> which is stated to be
> used in the load combinations of Section 1612.  In Section 
> 1612.2.1, Basic Load
> Combinations, "E" appears in two equations, 12-5 and 12-6.  
> HOWEVER, in reading
> the SEAOC Blue Book, Ev was intended for equation 12-5 ONLY 
> (See Blue Book
> commentary C105.1.1 and Equation 101-5).
> 
> Was this a mistake or did ICBO/UBC conscientiously change 
> this??  For a regular
> building, this has the effect of changing equation 12-6 to 
> 0.7D +/- 1.0E.  This
> probably wont effect footing sizing since they are sized 
> using allowable load
> design but this could throw concrete columns into tension and 
> could increase
> anchor bolt diameter and embedment if you are using strength 
> design (ACI 349
> approach).
> 
> 
> Thomas Hunt, S.E.
> Fluor Daniel
>