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RE: SDC D Ordinary Moment frame connection using HSS sections

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Section as referenced by footnote "h" allows OMF under certain limitations for structures in D or E. These limitations are very generous.
Regarding HSS, "User Note" in Section 11.1 of AISC-Seismic gives you a hint. HSS can be used.
Suresh Acharya, S.E.

From: Casey K. Hemmatyar [mailto:khemmatyar(--nospam--at)]
Sent: Thursday, August 14, 2008 8:32 AM
To: seaint(--nospam--at)
Subject: RE: SDC D Ordinary Moment frame connection using HSS sections

No. OSMF is not permitted, period.
This is not because of HSS sections.
You may refer to Table 12.2-1;  item C4.
OSMF is only permitted in SDC A, B & C.
In SDC D one can only go with SMRF or if qualifies for footnote "h", may use ISMF.


Casey (Khashayar) Hemmatyar


From: Joseph R. Grill [mailto:jrgrill(--nospam--at)]
Sent: Wednesday, August 13, 2008 9:28 PM
To: seaint(--nospam--at)
Subject: SDC D Ordinary Moment frame connection using HSS sections


Can HSS sections be used in an Ordinary Moment Frame in a SDC D.  I can't see, in the seismic design manual,  where it is specifically excluded, but I can't find any information for the HSS Beam to HSS column connection design.  It seems that it can't be done since a full pen weld is difficult if not impossible to do for a HSS beam to HSS Column face.  If there is an example out there I would love to see it.  I am doing some work for a fabricator and they are expecting HSS sections due to what is seen in the construction documents.  I have to let him know real soon if he will need to go to wide flange members.


Thanks for the help,

Joe Grill


Joseph R. Grill, PE

Verde Valley Engineering, PLLC

2220 Sky Drive

Clarkdale, AZ 86324

Ph. (928) 600-5459

Fax (928) 649-3659

email: VVEng(--nospam--at)

 (Khashayar) Hemmatyar
Private email <k(--nospam--at)>