关键词: 塑料大棚, 拱架, 最不利荷载组合, Ansys

Abstract: Steel frame plastic greenhouse is the most common type of horticultural facilities in China. But there is no concise and applicable local standard to use in the design and construction, which leads to frequent safety problems in the use of plastic greenhouse. This study was to promote the standardized development of plastic greenhouse in Henan Province and provide scientific basis for its design and construction. The plastic greenhouses models designed by 7 common arch materials under different spans (8, 10, 12 and 14 m) were established by Ansys Workbench. The maximum stress of ground joints of plastic greenhouses with different spans and different arch materials under different load combinations in 18 areas of Henan Province was compared, and the control load and the most dangerous load combination were selected. Then the safety of these models were checked by using the ultimate limit state under the most dangerous load combination, and the selection of arch material specifications of plastic greenhouse in Henan Province were suggested. The results showed that the control load of plastic greenhouses in Luanchuan, Nanyang, Shangqiu and Gushi is snow load, and the most dangerous load combination was permanent load + 1.2 × Uneven snow load, the control load of plastic greenhouses in other 14 areas was wind load, and the most dangerous load combination was permanent load + 1.0 × Wind load. In 18 areas of Henan Province, wind load was the primary dangerous load of plastic greenhouse, which has the greatest impact on the safety of plastic greenhouse, followed by snow load. 24 plastic greenhouse models were used to simulate and calculate the maximum joint stress of the most unfavorable load combination in 18 areas of Henan Province. 432 groups of safety calculations were carried out, and suggestions on the selection of material specifications suitable for different span plastic greenhouses under different wind load levels in 18 areas of Henan Province were put forward, which had wide applicability.

Key words: plastic greenhouse, arch beam, most dangerous load combination, Ansys