Structure / Lateral bracing system

X-bracing

/ˈɛks ˌbreɪs.ɪŋ/noun

Named for the X shape formed by two crossing diagonals.

Definition

A pair of diagonal members crossing within a frame bay to resist sideways forces from wind or earthquakes by turning them into tension and compression.

Lateral loadCrossing diagonalsFrame column
Fig. 65 — X-bracing: schematic studyNOT TO SCALE
Illustrative photograph of x-bracing
Illustrative study — X-bracing · AI-generatedSAMPLE IMAGE
Photo study — X-bracing · AI-generated00:06

Structural & construction notes

Slender rods or cables work in tension only, so one diagonal acts in each direction of sway. Connections at the corners must carry the full brace force, and the bays chosen for bracing affect openings and layout.

An educational reference. Project-specific design requires professional guidance.