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C12.2 STRUCTURAL SYSTEM SELECTION
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C12.2.5.6 Steel Ordinary Moment Frames: Steel ordinary moment frames (OMFs) are less ductile than steel special moment frames; consequently, their use is prohibited in structures assigned to Seismic Design Categories D, E, and F (Table 12.2-1). Structures with steel OMFs, however, have exhibited acceptable behavior in past earthquakes where the structures were sufficiently limited in their structural height, number of stories, and seismic mass. The provisions in the standard reflect these observations. The exception is discussed separately below. Table C12.2-1 summarizes the provisions.
12.2.4 Combination Framing Detailing Requirements
Structural members common to different framing systems used to resist seismic forces in any direction shall be designed using the detailing requirements of ASCE 7-16 Chapter 12 required by the highest response modification coefficient, R, of the connected framing systems.
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