敞开结构 meaning in English

open structure

Determination of the dimensions of prefabricated reinforced components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure
采用热压充气混凝土或敞开结构轻型聚集式混凝土制成的预制增强构件的尺寸测定
Determination of shear strength of welded joints of reinforcement mats or cages for prefabricated components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure
高压充气混凝土或敞开结构轻型聚集混凝土预制件用加筋毡或框架的焊缝剪切强度测定