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Re: Low, Moderate/Intermediate, or High Seismic Risk

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Also take a look at the ACI 318 commentary.  If I recall correctly, there
is some description of the correlation, but since I don't have my ACI 318
in front of me, I can't say for sure.

Scott
Adrian, MI


On Wed, 7 Mar 2007, dave brown wrote:

> Check the IBC Section 1908.
>
> Dave Brown
>
> On 3/7/07, Chuck Hanson <Chuckh(--nospam--at)dpsdesign.org> wrote:
> >
> > Hi All,
> >
> > One of our engineers is trying to determine the relationship between a
> > structure's Seismic Design Category and Seismic Use Group as defined by
> > IBC and the seismic designations used in ACI 318 Chapter 21.  ACI 318
> > Chapter 21 makes designations on seismic design requirements based on
> > "Low", "Intermediate", and "High" seismic risk.
> >
> > "Design of Concrete Structures 13th Edition" by Nilson suggests the
> > following relationship between SDC and seismic risk level:
> >
> > high seismic risk - SDC D, E, and F
> > moderate / intermediate seismic risk - SDC C
> > low / no seismic risk - SDC A and B
> >
> > Another publication "Seismic and Wind Forces" written in accordance with
> > IBC 2003 by Alan Williams seems to suggest the following relationship
> > between SDC and seismic risk:
> >
> > high seismic risk - SDC D, E, and F for SUG I, II, and III provided that
> > SDS > 0.5g and SD1 > 0.2g
> > moderate / intermediate seismic risk - SDC B and C for SUG I, II, and
> > III provided that 0.167g < SDS < 0.5g and 0.067g < SD1 < 0.2g
> > moderate / intermediate seismic risk - SDC D for SUG III provided that
> > 0.33 g < SDS < 0.5g and 0.133g < SD1 < 0.2g
> > low seismic risk - SDC A for SUG I, II, and III provided that SDS <
> > 0.167 g and SD1 < 0.067g
> >
> > These are slightly different in that a SUG III building in SDC D falls
> > into the moderate category according to Williams. Is anyone aware of an
> > "official" ACI definition of low, moderate and high that would apply
> > here?
> >
> > Chuck Hanson, PE, LEED AP
> > Principal
> > chuckh(--nospam--at)dpsdesign.org
> > Dekker/Perich/Sabatini
> > Albuquerque, NM
> >
> >
> >
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