retractable structures

基本解釋

Planar multi-angulated beams are commonly used in retractable structures.
平面折梁單元是可開啟結構中的常用單元類型。
dictall.com
Retractable structures have been widely adopted in large-sized palaestra and multipurpose buildings.
開合結構在大型體育館、多用途體育場得到廣泛應用。
These typical realized retractable roof buildings provide us with great references to further research. The research of retractable roof structures is only at the beginning in China.
目前我國對開合結構的研究還處于起步階段，國內(nèi)已建成的數(shù)座小跨度開合屋蓋建筑結構形式和開合機理較為簡單，相應的有參考價值的工程資料也很有限。