A structural system where beams and columns are rigidly connected to resist bending moments, allowing the frame to carry lateral loads through the stiffness of its joints. Moment frames provide structural stability without diagonal bracing.
From 'moment' (rotational force causing bending) and 'frame' (structural skeleton), terminology developed in the early 20th century as engineers formalized rigid joint analysis. The concept evolved with steel construction and welded connections.
Moment frames are why modern office buildings can have floor-to-ceiling windows without X-braced diagonal members blocking the view! The rigid connections between beams and columns turn the entire building frame into a structural system that can sway with wind and earthquakes while maintaining stability.
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