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RE: HSS and FEMA 350

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I presume this discussion is limited to moment-resisting frames?  For example,
are eccentrically-braced, non-moment-resisting frames impacted?

-Keith Fix, PE
-Little Rock, AR

--- "Carter, Charlie" <carter(--nospam--at)aisc.org> wrote:
> > It is currently my understanding that there are no
> >provisions in FEMA that allow for pre-qualified
> >connections of HSS sections.  If anyone is aware
> >of any criteria or provisions for these types of
> >connections please let me know.
>  
> FEMA 350 only covered W-shapes. Two options for HSS I can think of:
>  
> 1.	If it is permitted to use R=3, systems of normal ductility and the
> AISC Specification (without the additional requirements in the AISC Seismic
> Provisions) can be used. This is probably the least-cost approach in any
> case when R=3 is permitted.
> 2.	If you must meet the AISC Seismic Provisions (i.e., you are in
> Seismic Design Category D, E or F), perhaps you can use an OMF per 2002 AISC
> Seismic Provisions Part I, Section 11.
> The AISC Seismic Provisions are avilable for free download at
> <http://www.aisc.org> http://www.aisc.org.
>  
> Charlie
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