G1.1 Scope
Composite ordinary moment frames (C-OMF) shall be designed in conformance with this section. This section is applicable to moment frames with fully restrained (FR) connections that consist of either composite or reinforced concrete columns and structural steel, concrete-encased composite, or composite beams.
G1.2 Basis of Design
C-OMF designed in accordance with these provisions are expected to provide minimal inelastic deformation capacity in their members and connections.
The requirements of Sections A1, A2, A3.1, A3.5, A4, B1, B2, B3, B4, D2.7, and Chapter C apply to C-OMF. All other requirements in Chapters A, B, D, I, J, and K are not applicable to C-OMF.
User Note: Composite ordinary moment frames, comparable to reinforced concrete ordinary moment frames, are only permitted in seismic design categories B or below in ASCE/SEI 7. This is in contrast to steel ordinary moment frames, which are permitted in higher seismic design categories. The design requirements are commensurate with providing minimal ductility in the members and connections.
G1.3 Analysis
There are no analysis requirements specific to this system.
G1.4 System Requirements
There are no requirements specific to this system.
G1.5 Members
There are no additional requirements for steel or composite members beyond those in the Specification. Reinforced concrete columns shall meet the requirements of ACI 318, excluding Chapter 18.
G1.5a Protected Zones
There are no designated protected zones.
G1.6 Connections
Connections shall be fully restrained (FR) and shall satisfy the requirements of Section D2.7.
G1.6a Demand Critical Welds
There are no requirements specific to this system.