From: "Mark E. Deardorff" <MarkD(--nospam--at)DandDEng.com>
Date: Wed, 2 Feb 2000 11:51:29 -0800
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
> Thomas Hunt, S.E.
> Fluor Daniel