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

摘要： 为促进河南省塑料大棚的标准化发展，科学指导其设计和建造，以《温室结构荷载设计规范》中规定的河南省18个地区钢骨架塑料大棚为研究对象，利用Ansys Workbench软件分别建立了不同跨度下（8、10、12、14 m）7种常用拱架材料设计的塑料大棚模型，对比了河南省18地区不同跨度不同拱架材料塑料大棚在不同荷载组合下的节点最大应力，筛选出控制荷载和最不利荷载组合，然后利用最不利荷载组合下的承载能力极限状态验算了其安全性，给出了河南省塑料大棚拱架材料规格选型建议。结果表明：河南省18地区中，栾川、南阳、商丘和固始4地塑料大棚的控制荷载是雪荷载，最不利荷载组合为永久荷载+1.2×不均匀雪荷载，其他14地区塑料大棚的控制荷载为风荷载，最不利荷载组合为永久荷载+1.0×风荷载。在河南省18地区中，风荷载是塑料大棚的首要不利荷载，对塑料大棚的安全性影响最大，其次是雪荷载。在建立24个塑料大棚模型，模拟计算河南省18地区最不利荷载组合的节点最大应力，共432组安全性验算分析的基础上，提出了适用于河南省18地区不同跨度塑料大棚不同风荷载等级下的材料规格选择建议，具有广泛的适用性。

关键词: 塑料大棚, 拱架, 最不利荷载组合, Ansys