Cold-formed steel has been widely used for components and main force resisting systems incommercial, industrial, and residential buildings. Cold-formed steel structural members aredesigned using AISI S100, North American Specification for the Design of Cold-Formedstructures Members [AISI, 2007]. For applications in high seismic regions, additionalrequirements may be needed. In fact, cold-formed steel design standards have been developedfor applications in high seismic regions for both rack structures [RMI, 2004] and cold-formedsteel light frame construction [AISI, 2007a]. In 2003, the American Iron and Steel Institute(AISI) established a seismic design committee. Composed of suppliers, manufacturers,engineers, researchers and professors, the committee is responsible for developing designstandards applicable to cold-formed steel structural systems located in seismic regions. The firstedition of the Standard for Seismic Design of Cold-Formed Steel Structural Systems – SpecialBolted Moment Frames (hereinafter referred as the Standard) was finished in 2007. As the titleindicates, this edition of the Standard focuses on the design of the seismic force resisting systemfor special bolted moment frames, which consist of tubular columns, cold-formed channel beamsand bolted moment connections. A typical connection of a cold-formed steel special boltedmoment frame (CFS-SBMF) is illustrated in Figure 1. This type of special bolted moment frameis widely used in industrial platform mezzanines such as the one shown in Figure 2.The 2007 edition of the Standard is based on the 2005 edition of the ANSI/AISC 341,Seismic Provisions for Structural Steel Buildings, [AISC, 2007] and research work [Sato andUang, 2007] on cold-formed steel special bolted moment frame systems as a seismic forceresisting system. This paper will briefly review the design provisions included in the Standard.
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