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RE: OMRF- IBC2000 vs UBC1997

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I can't point to an exact reason, but commentary from some of the steel moment seminars leads me to believe that AISC wants people use special frames of all types for almost everything (except maybe SDC A and B).  I would expect the penalties to keep going for using ordinary frames in zone with moderate seismicity as well.
Jake Watson, P.E.
Salt Lake City, UT
-----Original Message-----
From: marfra [mailto:marfra(--nospam--at)]
Sent: Sunday, October 27, 2002 6:11 AM
To: seaint(--nospam--at)
Subject: OMRF- IBC2000 vs UBC1997

Does anyone know the reason why the height limitation of 160 ft for OMRFs in UBC 97 has been reduced to 35 feet in the IBC2000, for structural steelwork buildings in SDC D.
Mark Francois