Moment frame
A moment frame is a structural frame whose beam-to-column joints are rigid, so the frame resists sideways loads by bending rather than by diagonal bracing or solid walls.
A moment frame is a structural frame whose beam-to-column joints are rigid, so the frame resists sideways loads by bending rather than by diagonal bracing or solid walls.
Definition
A moment frame is a structure of beams and columns joined with connections stiff enough to transfer bending between members. When wind or an earthquake pushes the building sideways, the joints resist rotation and the whole frame flexes as one.
A plain example
Illustrative example: a ground-floor retail space needs wide open glazing with no room for diagonal braces. The engineer of record might place moment frames at the storefront line so the lateral load is carried there instead of by braces.
Why it matters
It frees up openings and floor plan, but the joints are heavier and more demanding to detail and fabricate than simple connections.
Common confusion
Moment frames are often confused with braced frames and shear walls. Those resist sideways load by axial force in diagonals or by in-plane wall action. A moment frame relies on joint stiffness.
On a project
Ask whether the design uses moment frames, braced frames or shear walls, and who designs and checks the connections. Confirm the connection details are on the shop drawings before fabrication.
Quick answers
- Is a moment frame the same as a rigid frame? The terms overlap. Both describe frames with stiff joints, though code language and detailing categories differ.
- Do moment frames need special connections? Often yes. The connection type and its detailing come from the engineer of record and the governing code.
- Can a light steel house use moment frames? Some do in specific locations. Whether it is appropriate is an engineering decision for the project.
Related terms
Always check the project drawings and specification, and confirm requirements with the engineer of record and the local authority.
Questions people ask
Is a moment frame the same as a rigid frame?
The terms overlap. Both describe frames with stiff joints, though code language and detailing categories differ.
Do moment frames need special connections?
Often yes. The connection type and its detailing come from the engineer of record and the governing code.
Can a light steel house use moment frames?
Some do in specific locations. Whether it is appropriate is an engineering decision for the project.
Sources and further reading
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