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Special Truss Moment Frames and Joist Girders

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In large buldings such as one-story warehouses and industrial plants moment frames consisting of joist girders (or sometimes ordinary joists) with rigid connections to steel columns are sometimes used to resist lateral loads. This system is described in the Steel Joist Institute Technical Digest 11, "Design of Joist-Girder Frames". This publication is dated 1999, which is after the 1997 AISC Seismic Provisions came out, however I haven't found much in the SJI publication that addresses using these frames for seismic loads. Has anyone used joists or joist girders to create a STMF in accordance with the AISC Seismic Provisions for an IBC Seismic Design Category D (or above situation)? In other words, can joist suppliers provide joist girders (or joists) that meet the AISC requirements? If not, is this system now relegated to use only in Seismic Design Category C and below as a "Structural Steel Systems Not Specifically Designed for Seismic Resistance" (R = 3) ?

Rick Burch
Columbia, SC


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