Moment Resisting Frames
Frames that resist lateral load through rigid beam-to-column connections, keeping bays free of bracing.
Technical Overview
Moment frames provide open bays for architectural flexibility. Stiffness rather than strength often governs, so drift and second-order effects drive member sizes. In seismic regions, special detailing and capacity design rules apply.
Applications
- Multi-storey offices and commercial buildings
- Buildings needing open façades
- Industrial frames with clear access
Engineering Considerations
- Inter-storey drift and P-Delta effects
- Panel zone shear and continuity plates
- Seismic ductility class and prequalified connections where required
- Connection cost versus member size
Fabrication Considerations
- Full-penetration welds may need ultrasonic testing
- Column stiffeners add fabrication time
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