Structural · definition
A rigid steel or engineered frame that resists lateral load without bracing — used to keep a wide opening (e.g., a removed wall or garage front) stable.
Source: NIST — Seismic Design of Steel Special Moment Frames: A Guide for Practicing Engineers
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Where this term fits in a remodel
The pillar guides set terms like this one in context — what the work involves, what drives its cost, and where it sits in the sequence of a project. Pricing a specific house takes a defined scope and an on-site assessment.