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Re: special load combos for steel frame connection to foundation? AIS C Seismic?

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Section 8.5 of the 2002 AISC Seismic Provisions may give you some guidance which states:

The connection of the structure frame elements to the Column Base and the connection of the Column Base to the foundations shall be adequate to transmit the forces for which the frame elements were required to be designed.

Thomas Hunt, S.E.
ABS Consulting

"Haan Scott M DPW CIVIL ENGR(n)" <scott.haan(--nospam--at)>

04/14/2003 10:57 AM
Please respond to seaint

        To:        seaint(--nospam--at)
        Subject:        special load combos for steel frame connection to foundation? AIS        C Seismic?

IBC 1913.3.2 indicates that concrete anchors should be designed for the normal LRFD 1605.2 load combinations when E=seismic is involved.  IBC 1908.1.2 indicates that the regular 1605.2 regular LRFD load combinations should be used for designing concrete for E=seismic.  I know people have talked about whether when connecting a steel frame to the foundation that the 1605.4 special load combinations are required.  
Does AISC Seismic say anywhere that the connection to the foundation needs to be designed for the special load combinations?  It is a foundation connection not a brace connection and I cannot locate a requirement.  Also does the IBC require special load combinations for connecting a steel frame to the foundation?  
Scott Haan, P.E.
DPW Ft Richardson, AK
phone: 907-384-3161
fax: 907-384-3051