Shell structure
A thin curved surface distributes load through membrane action and covers large spaces without deep beams.
Domes, cylindrical shells, and hyperbolic forms use curvature to spread force. The Pantheon and Sydney Opera House illustrate this spatial ambition, though Sydney combines ribs and precast units.
Modern shells use cast concrete, precast panels, or steel gridshells. Costly formwork has encouraged repetition and digital fabrication.
Buckling, openings, and support conditions are difficult parts of analysis. A beautiful curve alone does not make a viable shell.
Geometric precision and crack control indicate construction quality. Exposed shells also need waterproofing and insulation designed for curved surfaces.
