TERM SPOTLIGHTENTRY 013
Structure / Load-bearing element
Arch
/ɑːrtʃ/noun
From Latin arcus, meaning “bow” or “curve,” through Old French arche.
Definition
A curved structural element that spans an opening and supports the weight above it. An arch transfers loads through compression along its curve, directing them into the supporting piers or abutments on either side.
Fig. 13 — Anatomy of a semicircular masonry archNOT TO SCALE
Structural & construction notes
In a traditional masonry arch, wedge-shaped blocks called voussoirs are arranged around the curve. The central keystone completes the ring. Temporary support, known as centering, holds the stones during construction until the arch is complete. The supports must resist both vertical loads and outward thrust.
An educational reference. Project-specific design requires professional guidance.