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Steel Interchange


Prequalified Connection
Is there a prequalified moment connection with a welded flange and bolted web available in ANSI/AISC 358-05? FEMA 350 includes a Welded Unreinforced Flange – Bolted Web (WUF-B) Connection. I do not see this connection included in ANSI/AISC 358-05 or Supplement No. 1.

Answer

The WUF-B connection is not listed in ANSI/AISC 358-05. This connection was included in FEMA 350, but only for Ordinary Moment Frame (OMF) applications. ANSI/AISC 358 is a standard of prequalified moment connection for Special and Intermediate Moment Frames (SMF and IMF). The AISC Seismic Provisions (341-05) does not require conformance demonstration for OMF systems, as is required for SMF and IMF systems.

 

Kurt Gustafson, S.E., P.E.

Posted on April 20, 2010


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