What Is a Braced Frame?
A braced frame is a structural system that resists lateral forces through diagonal bracing members. The braces act in tension and compression to transfer wind and earthquake loads to the foundation. It's the most efficient (and economical) lateral system for many building types.
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How braced frames work
Diagonal steel members (or concrete/masonry shear walls) create triangulated geometry that resists sideways movement. When lateral forces push the building, the braces carry the load axially — in tension or compression — which is the most efficient way for structural members to work. This is why braced frames use less material than moment frames.
Types of bracing
Concentric bracing (X-brace, chevron, single diagonal) connects at beam-column joints. Eccentric bracing intentionally offsets the connection to create a ductile link that yields in earthquakes. Buckling-restrained braces (BRBs) are specialized members that yield in both tension and compression without buckling — popular in high-seismic zones.
Architectural tradeoffs
The downside of braced frames: diagonal members obstruct bays where they're placed. You can't put a window or door through a brace. Architects must coordinate brace locations early. Moment frames cost more but keep bays open. The choice affects both the floor plan and the budget.
The bottom line
Braced frames are the most economical lateral system but obstruct bays with diagonal members. Coordinate locations with architecture early.
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