Abstract:

In order to improve the mechanical performance of the greenhouse skeleton, prove the feasibility of the assembled skeleton in the solar greenhouse structure, and then optimize the assembly design of the solar greenhouse skeleton, this study took a solar greenhouse in Yangling District of Shaanxi Province as the research object, and selected the oval single tube skeleton structure. The joint design and finite element analysis were carried out under two different connection modes of internal and external assembly. Three common specifications of 8 cm, 9 cm and 10 cm were selected to assemble the elliptical steel pipe respectively. ANSYS software was used to calculate the force and deformation of the joints at the connection parts of the assembled oval pipe span under the concentrated force of 5 kN, 7 kN and 10 kN, and then the untruncated elliptical steel pipe was set as the control group for comparison. The results showed that the structural deformation of the assembled solar greenhouse was minimal when the 10cm long connector was placed in the oval tube. In addition, when the main section angle was 10°, the stress was the least. In this study, the elliptical assembled skeleton and the assembly node for it were developed. The mechanical performance of the assembled skeleton was studied by static test. Finally, the reliability of the static test and the feasibility of the assembly design of the solar greenhouse skeleton were verified by finite element numerical simulation. This study can provide a basis for the assembly development of elliptical skeleton and the optimization of assembly joints in solar greenhouse.

Key words: solar greenhouse, facility agriculture, oval skeleton, assembly type, finite element analysis