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Re: IBC Sec. 1617.1

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Thanks Scott.  This agrees exactly with my argument, but now I have someone
else to back me up.

----
Jason Kilgore
Leigh & O'Kane, L.L.C.
jkilgore(--nospam--at)leok.com
816-444-3144
816-444-9655 (FAX)
----- Original Message ----- 
From: "Scott Maxwell" <smaxwell(--nospam--at)engin.umich.edu>
To: <seaint(--nospam--at)seaint.org>
Sent: Friday, September 12, 2003 1:22 PM
Subject: Re: IBC Sec. 1617.1


> Jason:
>
> To me, the definition of E just after Equation 16-28 should help provide
> some clarification.
>
> It states:
>
> "E = The combined effect of horizontal and VERTICAL earthquake-induced
> forces."  (emphasis is mine)
>
> Add to that, that QsubE is defined as:
>
> "QsubE = The effect of horizontal seismic forces."
>
> To me, that makes the 0.2SsubDS*D term a vertical component term.
>
> Further more, this is consistant with how the 1997 UBC deals with the
> similar situation (and the 1997 UBC is to some degree at least a minimal
> basis for what is in the 2000 IBC).  The similar equation in the UBC (eq
> 30-1) is E = rho*Eh + Ev.  And Ev is clearly defined as the vertical
> component of the earthquake ground motion ("Ev = the load effect resulting
> from the vertical component of the earthquake ground motion and is equal
> to an addition of 0.5*Ca*I*D to the dead load effect, D, for Strength
> Design, and may be taken as zero for Allowable Stress Design.")
>
> And last, since the 2000 IBC Seismic provisions are basically based off of
> the NEHRP Provisions, you could get a hold of the 1997 NEHRP provision and
> see what the commentary says on this section.
>
> HTH,
>
> Scott
> Ypsilanti, MI



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