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Re: PEMB and AISC Seismic Provisions

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Copies of AISC Seismic and AISC Supplement No. 2 can be downloaded for free

1) Yes, the low rise exemption for OCBF was removed in November, 2000 by
AISC Seismic Supplement No. 2.

2a) Yes.  PEMBs can meet the requirements for an OCBF (R = 5) if they
design the rod bracing for omega-sub-zero forces and design the rod bracing
connections for the expected tensile strength of the brace (Ry * Ag * Fy).

2b) Yes.  If you are Seismic Design Categories A, B, or C, PEMBs can use an
R of 3 and design the rod bracing per LRFD or ASD alone.


Rick Drake, SE
Fluor Daniel, Aliso Viejo, CA


                      "Mark D. Anderson                                                                                                
                      PE"                      To: <seaint(--nospam--at)>                                                                 
            >                   cc:                                                                                     
                      12/19/02 02:19 PM                                                                                                
                      Please respond to        Subject:  PEMB and AISC Seismic Provisions                                              

Regarding PEMB,

1.  Is it true that in the world of the IBC and AISC seismic provisions,
that the historic "low rise buildings" exemption (Section 14.5 in the AISC
Provisions Part 1) has been deleted in its entirety by Supplement No. 2?

2.  If the deletion of the "low rise" exemption is true, or if it were
deleted at the discretion of the writer of a specific project criteria, is
the PEMB industry capable of meeting the letter of the AISC seismic
provisions inclusive of Supplements 1 and 2, the same as for other
conventional SMF/OMF and SCBF/OCBF steel-framed buildings?

Thank you,

Mark D. Anderson  PE

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