Abstract:

In order to avoid the overall structural damage caused by the failure of local components, a Venlo type greenhouse in Xianyang area was selected as the research object, and an improved sensitivity analysis method was applied based on the basic mechanism of continuous collapse resistance, and the key components of the continuous greenhouse structure and their distribution were obtained. The design and optimization of the greenhouse skeleton section was carried out by MIDAS-GEN software, and then the sensitivity coefficient of the column was determined by combining the demolition member method and the sensitivity analysis method in ANSYS software. The results showed that: (1) the sensitivity coefficient of the long side column was close to that of middle column and greater than that of the short side column, and the sensitivity coefficient of the short side column was greater than that of the corner column; (2) the sensitivity coefficient of the long side column near both ends increased significantly, and the column with truss hinged had a slightly higher sensitivity coefficient than that of other columns; (3) the sensitivity coefficient of the middle column showed a positive correlation with the direct stress, while the long and short column were opposites. The research results can provide a reference for the optimization of multi-span greenhouse and the study of continuous collapse resistance.

Key words: multi-span greenhouse, continuous collapse, key components, susceptibility