Structure / Infill zone
Spandrel
/ˈspæn.drəl/noun
Probably from Anglo-Norman spaundre, related to “spread.”
Definition
The roughly triangular area between the curve of an arch and its rectangular frame, or between adjacent arches; in curtain walls, the opaque panel between floors.
Fig. 38 — Spandrel: schematic studyNOT TO SCALE
Illustrative study — Spandrel · AI-generatedSAMPLE IMAGE
Photo study — Spandrel · AI-generated00:06
Structural & construction notes
In masonry, spandrel fill adds weight that helps stabilize the arch. Curtain-wall spandrels conceal floor slabs and contain insulation and fire-stopping at the slab edge.
An educational reference. Project-specific design requires professional guidance.