藝術與建築詞典根目錄
....物件層面
........組件 (層級名)
............成分
................<依特定背景區分之組件>
....................建築元素
........................<結構元素與結構元素構造>
............................<結構元素>
................................<跨接與外伸結構元素>
....................................樑 (結構元素)
........................................<依形式區分之橫樑>
............................................托樑
|||................................................平頂擱柵
|||................................................地板托樑
|||................................................開腹樑
|||............................................箱形樑