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2211.1.1 Seismic requirements for cold-formed steel structural systems.
The design of cold-formed steel light-frame construction to resist seismic forces shall be in accordance with the provisions of Section 2211.1.1.1 or 2211.1.1.2, as applicable.
2211.1.1.1 Seismic Design Categories B and C.
Where a response modification coefficient, R, in accordance with Table 1613.5 is used for the design of cold-formed steel light-frame construction assigned to Seismic Design Category B or C, the seismic force-resisting system shall be designed and detailed in accordance with the requirements of AISI S400.
Exception: The response modification coefficient, R, designated for "Steel systems not specifically detailed for seismic resistance, excluding cantilever column systems" in Table 1613.5 shall be permitted for systems designed and detailed in accordance with AISI S240 and need not be designed and detailed in accordance with AISI S400.
2211.1.1.2 Seismic Design Categories D.
In cold-formed steel light-frame construction assigned to Seismic Design Category D, the seismic force-resisting system shall be designed and detailed in accordance with AISI S400.
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