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- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: SCBF question
- From: Mark Pemberton <Markp(--nospam--at)lbdg.com>
- Date: Wed, 20 Dec 2000 11:07:14 -0800
Section 13.4.a.4 of the 1997 AISC Seismic Provisions Manual states: "The top and bottom flanges of the beam at the point of intersection of braces shall be designed to support a lateral force that is equal to 2 percent of the nominal beam flange strength Fy(bf)(tbf)" If the beam cannot be directly laterally supported at this location is it acceptable to design the beam using the special loading combinations of chapter 16 (97 UBC) along with a lateral force equal to Fy(bf)(tbf) in the weak direction at each flange and check the member for the combined biaxial bending and compression resulting? A plan checker at DSA suggested using 10% of the axial force in the beam resulting from the special loading combinations. Mark Pemberton, P.E..
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