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RE: OMF in low seismic zones

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I would approach this one with caution.  The highest seismic spectral values
in the continental US is in the New Madrid Seismic Zone in southeastern
Missouri, the southern tip of Illinois, and the northwestern section of

Where OMF's are permitted is defined in FEMA 302.  I am not aware of any
testing done that would preclude bolted web connections.

Who was the presenter at this AISC seminar?

Harold Sprague

> -----Original Message-----
> From:	Scott E Maxwell [SMTP:smaxwell(--nospam--at)]
> Sent:	Monday, June 19, 2000 1:26 PM
> To:	seaint(--nospam--at)
> Subject:	OMF in low seismic zones
> Greetings,
> One of my fellow employees attended a seminar by AISC called "Lateral
> Framing Systems East of the Rockies".  In the information from the
> seminar, there are a couple sketches of connections for OMF that show the
> web connection as being a welded shear tab (both to the colun and beam) w/
> erection bolts.  This seems to imply that the web connection can no longer
> be bolted.  Is this true?  Is the only approved (pre-tested) connection
> detail to weld the shear tab?  Or is it permited to be bolted to the beam
> web (using slip critical bolts)?
> Our use here is LOW seismic.
> Any thoughts or comments?
> Thanks,
> Scott
> --------------------------------------------------------------------------
> Scott E. Maxwell, PE, SE
> Structural Engineer
> HarleyEllis
> 26913 Northwetern Hwy.
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