Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. architectural elements
7. [structural elements and components for structural elements]
8. structural elements
9. structural systems
10. structural frames
11. rigid frames

Anotations

Scope note:

Rigid frame structures with closely spaced exterior columns rigidly connected to spandrel beams to form a tubelike exterior framework that carries all lateral loads, as in the World Trade Center towers, New York City.