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. [spanning and projecting structural elements]
10. beams (structural elements)
11. [beams by location or context]
12. crossbeams

Anotations

Scope note:

Rufu 乳栿, literally "infant beam" or "nursling beam" (Hanyu dacidian; Kroll 2015, 391), refers to cross beams that span two rafters, usually with one end located above the eaves puzuo 鋪作 and the other end inserted into an interior pillar. Liang Sicheng suggests that a rufu might also have both ends layered at the top of the puzuo (Liang 1983, 142; Chen 2008). Chen Mingda notes that a rufu should be located on the lowest level of the roof frame (Chen 2010, 196).